七段数码类??

Question

我写了一个类，画七段数码的，但是不知怎样调用，而且关键我的坐标不会处理，因为老师要求，把计算器放大，显示数码的面板也跟着放大。我头都大了，就是不会啊，我实在不知怎么处理坐标，所以把头一个坐标设为（50，50）。
class SevenDigitalDemo 
{
        public  int x=50;
        public  int y=50;
        public void UpDemoPainting(Graphics g)//UpDemoPainting
{
Polygon p1=new Polygon();
p1.addPoint(x,y);
p1.addPoint(x+20,y+20);
p1.addPoint(x+80,y+20);
p1.addPoint(x+100,y);
g.drawPolygon(p1);
g.setColor(Color.red);
g.fillPolygon(p1);}public void RightDemoPainting(Graphics g)//RightDemoPainting
{
Polygon p2=new Polygon();
p2.addPoint(x+83,y+23);
p2.addPoint(x+83,y+83);
p2.addPoint(x+96,y+96);
p2.addPoint(x+103,y+89);
p2.addPoint(x+103,y+3);
g.setColor(Color.red);
g.drawPolygon(p2);
g.fillPolygon(p2);
}
public void LeftDemoPainting(Graphics g)//LeftDemoPainting
{
Polygon p3=new Polygon();
p3.addPoint(x-3,y+3);
p3.addPoint(x-3,y+89);
p3.addPoint(x+4,y+96);
p3.addPoint(x+17,y+83);
p3.addPoint(x+17,y+23);
g.setColor(Color.red);
g.drawPolygon(p3);
g.fillPolygon(p3);
}
public void  MidDemoPainting(Graphics g)//MidDemoPainting
{
Polygon p4=new Polygon();
p4.addPoint(x+20,y+86);
p4.addPoint(x+80,y+86);
p4.addPoint(x+92,y+98);
p4.addPoint(x+80,y+106);
p4.addPoint(x+20,y+106);
p4.addPoint(x+8,y+98);
g.drawPolygon(p4);
g.fillPolygon(p4);
}public  void LeftdownDemoPainting(Graphics g)//LeftdownDemoPainting
{
Polygon p5=new Polygon();
p5.addPoint(x+4,y+100);
p5.addPoint(x+17,y+109);
p5.addPoint(x+17,y+169);
p5.addPoint(x-3,y+189);
p5.addPoint(x-3,y+107);
g.drawPolygon(p5);
g.fillPolygon(p5);
}public void RightdownDemoPainting(Graphics g)//RightdownDemoPainting
{
Polygon p6=new Polygon();
p6.addPoint(x+96,y+100);
p6.addPoint(x+103,y+107);
p6.addPoint(x+103,y+189);  
p6.addPoint(x+83,y+169);
p6.addPoint(x+83,y+109);
g.drawPolygon(p6);
g.fillPolygon(p6);
}public void DownDemoPainting(Graphics g)//DownDemoPainting
{
Polygon p7=new Polygon();
p7.addPoint(x+20,y+172);
p7.addPoint(x+80,y+172);
p7.addPoint(x+100,y+192);
p7.addPoint(x,y+192);
g.drawPolygon(p7);
g.fillPolygon(p7);
}
}
老师的意思是七段数码一定要画出来，按下1的时候，就显示七段数码中的1
，按下2，就显示2。
--------
|        |
|        |
|        |
|--------|
|        |
|        |
|        |
|        |
----------
即不同时间显示8的不同部位而已/

Answer 1

是不是大概这样写,不过还是没放大,你帮我写一段数码看看行吗.不然我可能有要走很多弯路,而且还可能白画??谢谢了,比如画画最上面的那一段,我是则样想的,刚开始让窗口的width=300,height=350来画图,然后拖动窗口,width,height也会跟着变,就可以了.拜托了,我快要交了.
import java.awt.*;
import javax.swing.*;class Drawpolyline extends Frame
{
public Drawpolyline()
{
super("drawpolyline");
//setSize(300,350);

pack();
show();
}
public void paint(Graphics g)
{

Polygon p1=new Polygon();
p1.addPoint(width/10,height/7);
p1.addPoint(width/10+20,height/7+20);
p1.addPoint(width/10+80,height/7+20);//上
p1.addPoint(width/10+100,height/7);
g.drawPolygon(p1);
g.setColor(Color.red);
g.fillPolygon(p1);

}
public void setBounds(int x,int y,int width,int height)
{ super.setBounds(x,y,width,height);
repaint();

}

public Dimension getMinimumSize()
{
return new Dimension(width,height);
}

public Dimension getPreferredSize()
{
return new Dimension(width,height);
}
private int width=300,height=350;



public static void main(String[] args)
{
new Drawpolyline();
}
}

Answer 2

看了这个程序,我还是照搬不上,因为c.add(new Star2(),BorderLayout.CENTER);star是画在frame中的,而我要画在panel上,我试了一下啊.我用extends  JComponent然后用paintComponent(Graphics g),不行.但是不能放大啊??import java.awt.*;
import javax.swing.*;class Star2 extends JComponent
{
public void paint(Graphics g)
{
double x1,x2,y1,y2;
for(double angle=0;angle<Math.PI;angle=angle+Math.PI/16)
{
x1=Math.cos(angle)*radius+radius;
y1=Math.sin(angle)*radius+radius;
x2=Math.cos(angle+Math.PI)*radius+radius;
y2=Math.sin(angle+Math.PI)*radius+radius;
g.drawLine((int)x1,(int)y1,(int)x2,(int)y2);
}
}

public void setBounds(int x,int y,int width,int height)
{
radius=Math.min(width,height)/2;
super.setBounds(x,y,width,height);
repaint();

}

public Dimension getMinimumSize()
{
return new Dimension(2*radius,2*radius);
}

public Dimension getPreferredSize()
{
return new Dimension(2*radius,2*radius);
}
private int radius=100;
}public class Nesting{
public static void main(String[] args)
{
JFrame frame=new JFrame("Nesting containers");
Container c=frame.getContentPane();
JPanel panel=new JPanel();
panel.setLayout(new GridLayout(4,1));
panel.add(new JButton("One"));
panel.add(new JButton("Two"));
panel.add(new JButton("Three"));
panel.add(new JButton("Four"));
c.add(panel,BorderLayout.WEST);
c.add(new Star2(),BorderLayout.CENTER);
frame.pack();
frame.show();
}

}

Answer 3

我有一个笨办法呵呵，不用画图，把一个显示管分为上下两部分，分别使用BorderLayout，不是由7根显示条显示，那么使用7个Label分别放在NORTH,SOURCH,WEST,EAST代替不就可以了，要显示的地方改变颜色即可，放大那么就更简单了，layout已经实现了嘛，呵呵，不错吧

Answer 4

当然是要先写一个类封装上面的这些操作，继承于Panle，那么计算结果有多少位，生成多少个类添加到显示区域的Panel里面即可以了

Answer 5

回复人： superman421(38度的雪) ( ) 信誉：100 
昨天我发给你的，还是有点不对.你运行一下就知道那儿不对了.上面的事例程序有public void setBounds(int x,int y,int width,int height)
{
radius=Math.min(width,height)/2;
super.setBounds(x,y,width,height);
repaint();

}

public Dimension getMinimumSize()
{
return new Dimension(2*radius,2*radius);
}

public Dimension getPreferredSize()
{
return new Dimension(2*radius,2*radius);
}而下面我写的好象没什么用.为什么??今天我要把这一段代码添加到我的计算器中了.import java.awt.*;
import javax.swing.*;class Drawpolyline extends Frame
{
public Drawpolyline()
{
super("drawpolyline");
//setSize(300,350);

pack();
show();
} public void paint(Graphics g)
{


        Dimension tsize=getSize();        g.setColor(getBackground());
        g.fillRect(0, 0, tsize.width, tsize.height);
        g.setColor(getForeground());
        width=tsize.width*3/8;
        height=tsize.height; 
; x[0]=a;
y[0]=b+5*height/232;
x[1]=x[0]+26*width/139;
y[1]=y[0]+26*height/232;
x[2]=x[1];
    y[2]=y[1]+67*height/232;
x[3]=x[2]-15*width/139;
    y[3]=y[2]+15*height/232;
x[4]=a;
y[4]=y[0]+96*height/232;
Polygon p1=new Polygon(x,y,5);
g.drawPolygon(p1);
g.setColor(Color.red);
g.fillPolygon(p1);


    x1[0]=x[0]+5*width/139;
y1[0]=y[0]-5*height/232;
x1[1]=x1[0]+127*width/139;
y1[1]=y1[0];
x1[2]=x1[1]-26*width/139;
y1[2]=y1[1]+26*height/232;
x1[3]=x[0]+31*width/139;
y1[3]=y1[0]+26*height/232;
Polygon p2=new Polygon(x1,y1,4);
g.drawPolygon(p2);
g.setColor(Color.RED);
g.fillPolygon(p2);


x2[0]=x1[2]+5*width/139;
y2[0]=y1[2]+5*height/232;
x2[1]=x2[0]+26*width/139;
y2[1]=y2[0]-26*height/232;
x2[2]=x2[1];
y2[2]=y2[1]+96*height/232;
x2[3]=x2[2]-8*width/139;
y2[3]=y[2]+15*height/232;
x2[4]=x2[0];
y2[4]=y2[0]+67*height/232;
Polygon p3=new Polygon(x2,y2,5);
g.drawPolygon(p3);
g.setColor(Color.RED);
g.fillPolygon(p3);

x3[0]=x[1];
y3[0]=y[2]+8*height/232;
x3[1]=x3[0]+86*width/139;
y3[1]=y3[0];
x3[2]=x3[1]+12*width/139;
y3[2]=y3[1]+12*height/232;
x3[3]=x3[2]-12*width/139;
y3[3]=y3[2]+12*height/232;
x3[4]=x3[3]-86*width/139;
y3[4]=y3[3];
x3[5]=x3[4]-12*width/139;
y3[5]=y3[3]-12*height/232;
Polygon p4=new Polygon(x3,y3,6);
g.drawPolygon(p4);
g.setColor(Color.RED);
g.fillPolygon(p4);



x4[0]=x3[4];
y4[0]=y3[4]+8*height/232;
x4[1]=x3[4];
y4[1]=y4[0]+67*height/232;
x4[2]=x4[1]-26*width/139;
y4[2]=y4[1]+26*height/232;
x4[3]=x4[2];
y4[3]=y4[2]-96*height/232;
    x4[4]=x4[3]+12*width/139;
y4[4]=y4[3]-11*height/232;
Polygon p5=new Polygon(x4,y4,5);
g.drawPolygon(p5);
g.setColor(Color.RED);
g.fillPolygon(p5);


x5[0]=x4[1]+5*width/139;;
y5[0]=y4[1]+5*height/232;
x5[1]=x5[0]+80*width/139;
y5[1]=y5[0];
x5[2]=x5[1]+26*width/139;
y5[2]=y5[1]+26*height/232;
x5[3]=x5[0]-26*width/139;
y5[3]=y5[0]+26*height/232;
Polygon p6=new Polygon(x5,y5,4);
g.drawPolygon(p6);
g.setColor(Color.RED);
g.fillPolygon(p6);


x6[0]=x2[3];
y6[0]=y2[3]+8*height/232;
x6[1]=x6[0]+10*width/139;
y6[1]=y6[0]+10*height/232;
x6[2]=x6[1];
y6[2]=y6[1]+96*height/232;
x6[3]=x6[2]-26*width/139;
y6[3]=y6[2]-26*height/232;
    x6[4]=x6[3];
y6[4]=y3[4]+8*height/232;
Polygon p7=new Polygon(x6,y6,5);
g.drawPolygon(p7);
g.setColor(Color.RED);
g.fillPolygon(p7);





}
public void setBounds(int x,int y,int width,int height)
{

super.setBounds(x,y,width,height);
repaint();

}

public Dimension getMinimumSize()
{
return new Dimension(width,height);
}

public Dimension getPreferredSize()
{
return new Dimension(width,height);
}
private int width=70,height=117,a=100,b=50;
;    int[] x =new int[5];
    int[] y =new int[5];
    
    int[] x1 =new int[4];
    int[] y1 =new int[4];
    
    int[] x2=new int[5];
    int[] y2 =new int[5];
    
    int[] x3=new int[6];
    int[] y3 =new int[6];
    
    int[] x4=new int[5];
    int[] y4=new int[5];
    
    
    int[] x5 =new int[4];
    int[] y5 =new int[4];
    
    int[] x6 =new int[5];
    int[] y6 =new int[5];
    
    
    
    




public static void main(String[] args)
{
new Drawpolyline();
}
}

Answer 6

为什么要直接在Frame里面画？？？？？？？？？？？？
不好理解！！！！！！！！！！！！！！
改成下面的样子就没有问题了。
import java.awt.*;
import javax.swing.*;class Drawpolyline extends JComponent
{
public void paint(Graphics g)
{      
        g.setColor(getBackground());
        g.fillRect(0, 0,width,height);
        g.setColor(getForeground()); x[0]=a;
y[0]=b+5*height/232;
x[1]=x[0]+26*width/139;
y[1]=y[0]+26*height/232;
x[2]=x[1];
    y[2]=y[1]+67*height/232;
x[3]=x[2]-15*width/139;
    y[3]=y[2]+15*height/232;
x[4]=a;
y[4]=y[0]+96*height/232;
Polygon p1=new Polygon(x,y,5);
g.drawPolygon(p1);
g.setColor(Color.red);
g.fillPolygon(p1);


    x1[0]=x[0]+5*width/139;
y1[0]=y[0]-5*height/232;
x1[1]=x1[0]+127*width/139;
y1[1]=y1[0];
x1[2]=x1[1]-26*width/139;
y1[2]=y1[1]+26*height/232;
x1[3]=x[0]+31*width/139;
y1[3]=y1[0]+26*height/232;
Polygon p2=new Polygon(x1,y1,4);
g.drawPolygon(p2);
g.setColor(Color.RED);
g.fillPolygon(p2);


x2[0]=x1[2]+5*width/139;
y2[0]=y1[2]+5*height/232;
x2[1]=x2[0]+26*width/139;
y2[1]=y2[0]-26*height/232;
x2[2]=x2[1];
y2[2]=y2[1]+96*height/232;
x2[3]=x2[2]-8*width/139;
y2[3]=y[2]+15*height/232;
x2[4]=x2[0];
y2[4]=y2[0]+67*height/232;
Polygon p3=new Polygon(x2,y2,5);
g.drawPolygon(p3);
g.setColor(Color.RED);
g.fillPolygon(p3);

x3[0]=x[1];
y3[0]=y[2]+8*height/232;
x3[1]=x3[0]+86*width/139;
y3[1]=y3[0];
x3[2]=x3[1]+12*width/139;
y3[2]=y3[1]+12*height/232;
x3[3]=x3[2]-12*width/139;
y3[3]=y3[2]+12*height/232;
x3[4]=x3[3]-86*width/139;
y3[4]=y3[3];
x3[5]=x3[4]-12*width/139;
y3[5]=y3[3]-12*height/232;
Polygon p4=new Polygon(x3,y3,6);
g.drawPolygon(p4);
g.setColor(Color.RED);
g.fillPolygon(p4);



x4[0]=x3[4];
y4[0]=y3[4]+8*height/232;
x4[1]=x3[4];
y4[1]=y4[0]+67*height/232;
x4[2]=x4[1]-26*width/139;
y4[2]=y4[1]+26*height/232;
x4[3]=x4[2];
y4[3]=y4[2]-96*height/232;
    x4[4]=x4[3]+12*width/139;
y4[4]=y4[3]-11*height/232;
Polygon p5=new Polygon(x4,y4,5);
g.drawPolygon(p5);
g.setColor(Color.RED);
g.fillPolygon(p5);


x5[0]=x4[1]+5*width/139;;
y5[0]=y4[1]+5*height/232;
x5[1]=x5[0]+80*width/139;
y5[1]=y5[0];
x5[2]=x5[1]+26*width/139;
y5[2]=y5[1]+26*height/232;
x5[3]=x5[0]-26*width/139;
y5[3]=y5[0]+26*height/232;
Polygon p6=new Polygon(x5,y5,4);
g.drawPolygon(p6);
g.setColor(Color.RED);
g.fillPolygon(p6);


x6[0]=x2[3];
y6[0]=y2[3]+8*height/232;
x6[1]=x6[0]+10*width/139;
y6[1]=y6[0]+10*height/232;
x6[2]=x6[1];
y6[2]=y6[1]+96*height/232;
x6[3]=x6[2]-26*width/139;
y6[3]=y6[2]-26*height/232;
    x6[4]=x6[3];
y6[4]=y3[4]+8*height/232;
Polygon p7=new Polygon(x6,y6,5);
g.drawPolygon(p7);
g.setColor(Color.RED);
g.fillPolygon(p7);

} public void setBounds(int x,int y,int width,int height)
{
this.width=width;
this.height=height;
super.setBounds(x,y,width,height);
repaint();

}

public Dimension getMinimumSize()
{
return new Dimension(width,height);
}

public Dimension getPreferredSize()
{
return new Dimension(width,height);
}
private int width=200,height=150,a=0,b=0;
;    int[] x =new int[5];
    int[] y =new int[5];
    
    int[] x1 =new int[4];
    int[] y1 =new int[4];
    
    int[] x2=new int[5];
    int[] y2 =new int[5];
    
    int[] x3=new int[6];
    int[] y3 =new int[6];
    
    int[] x4=new int[5];
    int[] y4=new int[5];
    
    
    int[] x5 =new int[4];
    int[] y5 =new int[4];
    
    int[] x6 =new int[5];
    int[] y6 =new int[5];
    
    
    public static void main(String[] args)
{
JFrame f=new JFrame("test");
f.getContentPane().add(new Drawpolyline());
f.pack();
f.setVisible(true);
}
}

Answer 7

我也想画在panel上，不过看不到，你瞧瞧我下面的程序。
写事件时我想把诸如g.drawPolygon(p7);
g.setColor(Color.RED);
g.fillPolygon(p7);都注释掉，而在写事件的时候写，不如按下一的时候，就把最右边的两段着色。但是我不知为什么p不可见，当然我把SevenDigitalDemo当成内部类来用之后，当然还存在一个g问题，在public  void actionPerformed(ActionEvent e)好象不能用到g所以很难实行，你有什么好办法，建议以下。import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.color.*;
import javax.swing.JOptionPane;
class SevenDigitalDemo extends JPanel 
{ Polygon p1,p2,p3,p4,p5,p6,p7; public SevenDigitalDemo()
{
enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
}
    public void paintComponent(Graphics g)
{
super.paintComponent(g);

        
        Dimension tsize=getSize();        g.setColor(getBackground());
        g.fillRect(0, 0, tsize.width, tsize.height);
        g.setColor(getForeground());
        width=tsize.width/3;
        height=tsize.height*5/6;
        a=tsize.width/40;
        b=tsize.height/10;
         x[0]=a;
y[0]=b+12;//+5*height/232;
x[1]=x[0]+26*width/139;
y[1]=y[0]+26*height/232;
x[2]=x[1];
    y[2]=y[1]+67*height/232;
x[3]=x[2]-15*width/139;
    y[3]=y[2]+15*height/232;
x[4]=a;
y[4]=y[0]+96*height/232;
Polygon p1=new Polygon(x,y,5);
g.drawPolygon(p1);
g.setColor(Color.red);
g.fillPolygon(p1);


    x1[0]=x[0]+5*width/139;
y1[0]=y[0]-5*height/232;
x1[1]=x1[0]+127*width/139;
y1[1]=y1[0];
x1[2]=x1[1]-26*width/139;
y1[2]=y1[1]+26*height/232;
x1[3]=x[0]+31*width/139;
y1[3]=y1[0]+26*height/232;
Polygon p2=new Polygon(x1,y1,4);
g.drawPolygon(p2);
g.setColor(Color.RED);
g.fillPolygon(p2);


x2[0]=x1[2]+5*width/139;
y2[0]=y1[2]+5*height/232;
x2[1]=x2[0]+26*width/139;
y2[1]=y2[0]-26*height/232;
x2[2]=x2[1];
y2[2]=y2[1]+96*height/232;
x2[3]=x2[2]-8*width/139;
y2[3]=y[2]+15*height/232;
x2[4]=x2[0];
y2[4]=y2[0]+67*height/232;
Polygon p3=new Polygon(x2,y2,5);
g.drawPolygon(p3);
g.setColor(Color.RED);
g.fillPolygon(p3);

x3[0]=x[1];
y3[0]=y[2]+8*height/232;
x3[1]=x3[0]+86*width/139;
y3[1]=y3[0];
x3[2]=x3[1]+12*width/139;
y3[2]=y3[1]+12*height/232;
x3[3]=x3[2]-12*width/139;
y3[3]=y3[2]+12*height/232;
x3[4]=x3[3]-86*width/139;
y3[4]=y3[3];
x3[5]=x3[4]-12*width/139;
y3[5]=y3[3]-12*height/232;
Polygon p4=new Polygon(x3,y3,6);
    g.drawPolygon(p4);
g.setColor(Color.RED);
g.fillPolygon(p4);



x4[0]=x3[4];
y4[0]=y3[4]+8*height/232;
x4[1]=x3[4];
y4[1]=y4[0]+67*height/232;
x4[2]=x4[1]-26*width/139;
y4[2]=y4[1]+26*height/232;
x4[3]=x4[2];
y4[3]=y4[2]-96*height/232;
    x4[4]=x4[3]+12*width/139;
y4[4]=y4[3]-11*height/232;
Polygon p5=new Polygon(x4,y4,5);
g.drawPolygon(p5);
g.setColor(Color.RED);
g.fillPolygon(p5);


x5[0]=x4[1]+5*width/139;;
y5[0]=y4[1]+5*height/232;
x5[1]=x5[0]+80*width/139;
y5[1]=y5[0];
x5[2]=x5[1]+26*width/139;
y5[2]=y5[1]+26*height/232;
x5[3]=x5[0]-26*width/139;
y5[3]=y5[0]+26*height/232;
Polygon p6=new Polygon(x5,y5,4);
g.drawPolygon(p6);
g.setColor(Color.RED);
g.fillPolygon(p6);


x6[0]=x2[3];
y6[0]=y2[3]+8*height/232;
x6[1]=x6[0]+10*width/139;
y6[1]=y6[0]+10*height/232;
x6[2]=x6[1];
y6[2]=y6[1]+96*height/232;
x6[3]=x6[2]-26*width/139;
y6[3]=y6[2]-26*height/232;
    x6[4]=x6[3];
y6[4]=y3[4]+8*height/232;
Polygon p7=new Polygon(x6,y6,5);
g.drawPolygon(p7);
g.setColor(Color.RED);
g.fillPolygon(p7);






}
public void setBounds(int x,int y,int width,int height)
{
this.width=width;
this.height=height;
      super.setBounds(x,y,width,height);
        repaint();

}

Answer 8

接着：
public Dimension getMinimumSize()
{
return new Dimension(width,height);
}

public Dimension getPreferredSize()
{
return new Dimension(width,height);
}
private int width,height,a,b;    int[] x =new int[5];
    int[] y =new int[5];
    
    int[] x1 =new int[4];
    int[] y1 =new int[4];
    
    int[] x2=new int[5];
    int[] y2 =new int[5];
    
    int[] x3=new int[6];
    int[] y3 =new int[6];
    
    int[] x4=new int[5];
    int[] y4=new int[5];
    
    
    int[] x5 =new int[4];
    int[] y5 =new int[4];
    
    int[] x6 =new int[5];
    int[] y6 =new int[5];
    
       
}

public class Calculator extends JFrame implements ActionListener
{
    JButton button0,button1,button2,button3,button4,button5,button6,button7,button8,button9;
JButton buttonBk, buttonCe, buttonC;
    JButton buttonMC, buttonMR, buttonMS, buttonMAdd;
    JButton buttonDot, buttonAddAndSub, buttonAdd, buttonSub, buttonMul,
    buttonDiv, buttonMod;
    JButton buttonSqrt, buttonDaoshu, buttonEqual;
JTextField textOutput;
public Calculator()
{

super("计算器程序");
Container container=getContentPane();
     JPanel panel=new JPanel();
     container.add(panel);
     panel.setLayout(new BorderLayout());
     SevenDigitalDemo panel1=new SevenDigitalDemo();
     panel1.setBackground(Color.RED);
     panel1.add(new JButton("bbb"));
     panel.add(panel1,BorderLayout.NORTH);
     JPanel panel2=new JPanel();
     JPanel panel3=new JPanel();
     panel.add(panel2,BorderLayout.SOUTH);
     panel2.setLayout(new BorderLayout());
     panel2.add(panel3,BorderLayout.NORTH);
     panel3.setLayout(new FlowLayout(FlowLayout.RIGHT));
     JButton buttonBk = new JButton("Backspace");
     buttonBk.setForeground(new Color(255, 0, 0));
    JButton buttonCe = new JButton("CE");
     buttonCe.setForeground(new Color(255, 0, 0));
     JButton buttonC = new JButton("C");
     buttonC.setForeground(new Color(255, 0, 0));
     JButton buttonQuit=new JButton("Quit");
     buttonQuit.setForeground(new Color(255, 0, 0));
     buttonBk.addActionListener(this);
     buttonCe.addActionListener(this);
      buttonC.addActionListener(this);
      buttonQuit.addActionListener(this);
     panel3.add(buttonBk);
     panel3.add(buttonCe);
     panel3.add(buttonC);
     panel3.add(buttonQuit);
     JPanel panel4=new JPanel();
     panel2.add(panel4,BorderLayout.CENTER);
     panel4.setLayout(new GridLayout(4,5));
     JButton button0=new JButton("0");
     button0.setForeground(Color.BLUE);
     button0.addActionListener(this);
     JButton button1=new JButton("1");
     button1.setForeground(Color.BLUE);
     button1.addActionListener(this);
     JButton button2=new JButton("2");
        button2.setForeground(Color.BLUE);
        button2.addActionListener(this);
     JButton button3=new JButton("3");
        button3.setForeground(Color.BLUE);
      button3.addActionListener(this);
     JButton button4=new JButton("4");
     button4.setForeground(Color.BLUE);
     button4.addActionListener(this);
     JButton button5=new JButton("5");
     button5.setForeground(Color.BLUE);
     button5.addActionListener(this);
     JButton button6=new JButton("6");
     button6.setForeground(Color.BLUE);
     button6.addActionListener(this);
     JButton button7=new JButton("7");
        button7.setForeground(Color.BLUE);
        button7.addActionListener(this);
     JButton button8=new JButton("8");
        button8.setForeground(Color.BLUE);
        button8.addActionListener(this);
     JButton button9=new JButton("9");
     button9.setForeground(Color.BLUE);
      button9.addActionListener(this);
     JButton buttonDiv=new JButton("/");
     buttonDiv.setForeground(Color.RED);
      buttonDiv.addActionListener(this);
     JButton buttonSqrt=new JButton("sqrt");
     buttonSqrt.setForeground(Color.BLUE);
     buttonSqrt.addActionListener(this);
        JButton buttonMul=new JButton("*");
        buttonMul.setForeground(Color.RED);
       buttonMul.addActionListener(this);
        JButton buttonMod=new JButton("%");
        buttonMod.setForeground(Color.BLUE);
        buttonMod.addActionListener(this);
       JButton buttonSub=new JButton("-");
       buttonSub.setForeground(Color.RED);
       buttonSub.addActionListener(this);
       JButton buttonDaoshu=new JButton("1/x");
       buttonDaoshu.setForeground(Color.BLUE);
       buttonDaoshu.addActionListener(this);
       JButton buttonAddandSub=new JButton("+/-");
       buttonAddandSub.setForeground(Color.BLUE);
      buttonAddandSub.addActionListener(this);
     JButton buttonPoint=new JButton(".");
     buttonPoint.setForeground(Color.BLUE);
     buttonPoint.addActionListener(this);
      JButton buttonAdd=new JButton("+");
      buttonAdd.setForeground(Color.BLUE);
        buttonAdd.addActionListener(this); 
      JButton buttonEqual=new JButton("=");
        buttonEqual.setForeground(Color.red);
        buttonEqual.addActionListener(this);
      panel4.add(button7);
     panel4.add(button8);
      panel4.add(button9);
      panel4.add(buttonDiv);
      panel4.add(buttonSqrt);
      panel4.add(button4);
      panel4.add(button5);
      panel4.add(button6);
      panel4.add(buttonMul);
      panel4.add(buttonMod);
      panel4.add(button1);
      panel4.add(button2);
      panel4.add(button3);
      panel4.add(buttonSub);
     panel4.add(buttonDaoshu);
      panel4.add(button0);
      panel4.add(buttonAddandSub);
      panel4.add(buttonPoint);
      panel4.add(buttonAdd);
      panel4.add(buttonEqual);
setSize(350,300);
show();
}



public static void main(String[] args)
{
Calculator calculator=new Calculator();
calculator.setDefaultCloseOperation(Calculator.EXIT_ON_CLOSE);

}

public  void actionPerformed(ActionEvent e)
{
if (e.getSource()==button0)
{

}

}
}

Answer 9

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;public class Calculator extends JFrame implements ActionListener
{
    JButton button0,button1,button2,button3,button4,button5,button6,button7,button8,button9;
JButton buttonBk, buttonCe, buttonC;
    JButton buttonMC, buttonMR, buttonMS, buttonMAdd;
    JButton buttonDot, buttonAddAndSub, buttonAdd, buttonSub, buttonMul,
    buttonDiv, buttonMod;
    JButton buttonSqrt, buttonDaoshu, buttonEqual;
    DecimalComponent panel1;
JTextField textOutput;
public Calculator()
{

super("计算器程序");
Container container=getContentPane();
     JPanel panel=new JPanel();
     container.add(panel);
     panel.setLayout(new BorderLayout());
     panel1=new DecimalComponent();
     panel1.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
     panel.add(panel1,BorderLayout.CENTER);
     JPanel panel2=new JPanel();
     JPanel panel3=new JPanel();
     panel.add(panel2,BorderLayout.SOUTH);
     panel2.setLayout(new BorderLayout());
     panel2.add(panel3,BorderLayout.NORTH);
     panel3.setLayout(new FlowLayout(FlowLayout.RIGHT));
     JButton buttonBk = new JButton("Backspace");
     buttonBk.setForeground(new Color(255, 0, 0));
    JButton buttonCe = new JButton("CE");
     buttonCe.setForeground(new Color(255, 0, 0));
     JButton buttonC = new JButton("C");
     buttonC.setForeground(new Color(255, 0, 0));
     JButton buttonQuit=new JButton("Quit");
     buttonQuit.setForeground(new Color(255, 0, 0));
     buttonBk.addActionListener(this);
     buttonCe.addActionListener(this);
      buttonC.addActionListener(this);
      buttonQuit.addActionListener(this);
     panel3.add(buttonBk);
     panel3.add(buttonCe);
     panel3.add(buttonC);
     panel3.add(buttonQuit);
     JPanel panel4=new JPanel();
     panel2.add(panel4,BorderLayout.CENTER);
     panel4.setLayout(new GridLayout(4,5));
     JButton button0=new JButton("0");
     button0.setForeground(Color.BLUE);
     button0.addActionListener(this);
     JButton button1=new JButton("1");
     button1.setForeground(Color.BLUE);
     button1.addActionListener(this);
     JButton button2=new JButton("2");
        button2.setForeground(Color.BLUE);
        button2.addActionListener(this);
     JButton button3=new JButton("3");
        button3.setForeground(Color.BLUE);
      button3.addActionListener(this);
     JButton button4=new JButton("4");
     button4.setForeground(Color.BLUE);
     button4.addActionListener(this);
     JButton button5=new JButton("5");
     button5.setForeground(Color.BLUE);
     button5.addActionListener(this);
     JButton button6=new JButton("6");
     button6.setForeground(Color.BLUE);
     button6.addActionListener(this);
     JButton button7=new JButton("7");
        button7.setForeground(Color.BLUE);
        button7.addActionListener(this);
     JButton button8=new JButton("8");
        button8.setForeground(Color.BLUE);
        button8.addActionListener(this);
     JButton button9=new JButton("9");
     button9.setForeground(Color.BLUE);
      button9.addActionListener(this);
     JButton buttonDiv=new JButton("/");
     buttonDiv.setForeground(Color.RED);
      buttonDiv.addActionListener(this);
     JButton buttonSqrt=new JButton("sqrt");
     buttonSqrt.setForeground(Color.BLUE);
     buttonSqrt.addActionListener(this);
        JButton buttonMul=new JButton("*");
        buttonMul.setForeground(Color.RED);
       buttonMul.addActionListener(this);
        JButton buttonMod=new JButton("%");
        buttonMod.setForeground(Color.BLUE);
        buttonMod.addActionListener(this);
       JButton buttonSub=new JButton("-");
       buttonSub.setForeground(Color.RED);
       buttonSub.addActionListener(this);
       JButton buttonDaoshu=new JButton("1/x");
       buttonDaoshu.setForeground(Color.BLUE);
       buttonDaoshu.addActionListener(this);
       JButton buttonAddandSub=new JButton("+/-");
       buttonAddandSub.setForeground(Color.BLUE);
      buttonAddandSub.addActionListener(this);
     JButton buttonPoint=new JButton(".");
     buttonPoint.setForeground(Color.BLUE);
     buttonPoint.addActionListener(this);
      JButton buttonAdd=new JButton("+");
      buttonAdd.setForeground(Color.BLUE);
        buttonAdd.addActionListener(this); 
      JButton buttonEqual=new JButton("=");
        buttonEqual.setForeground(Color.red);
        buttonEqual.addActionListener(this);
      panel4.add(button7);
     panel4.add(button8);
      panel4.add(button9);
      panel4.add(buttonDiv);
      panel4.add(buttonSqrt);
      panel4.add(button4);
      panel4.add(button5);
      panel4.add(button6);
      panel4.add(buttonMul);
      panel4.add(buttonMod);
      panel4.add(button1);
      panel4.add(button2);
      panel4.add(button3);
      panel4.add(buttonSub);
     panel4.add(buttonDaoshu);
      panel4.add(button0);
      panel4.add(buttonAddandSub);
      panel4.add(buttonPoint);
      panel4.add(buttonAdd);
      panel4.add(buttonEqual);
pack();
show();
}

public static void main(String[] args)
{
Calculator calculator=new Calculator();
calculator.setDefaultCloseOperation(Calculator.EXIT_ON_CLOSE);

}

public  void actionPerformed(ActionEvent e)
{
panel1.setNum(-1234567890.456);
}
}

Answer 10

import java.awt.*;
import javax.swing.*;
import java.text.*;public class DecimalComponent extends JComponent
{
private int ComWidth=600,ComHeight=80;
private int width,height;
private int X=0,Y=0;
private String num="";
private int style[]=new int[8];
DecimalFormat fmt=new DecimalFormat("####.###############");

public DecimalComponent(){
this.setMinimumSize(new Dimension(ComWidth,ComHeight));
this.setPreferredSize(new Dimension(ComWidth,ComHeight));
} public void setNum(double a){
num=fmt.format(a);
if(num.length()>15)
num=num.substring(0,15);
repaint();
} public void paint(Graphics g)
{
this.setBackground(Color.white);
        g.setColor(getBackground());
        g.fillRect(0, 0,ComWidth,ComHeight);
        g.setColor(getForeground());
width=ComWidth/17;
int widthAll=ComWidth/15;
height=7*ComHeight/8;
Y=ComHeight/16;
X=ComWidth;

for(int i=num.length()-1;i>=0;i--){
if(num.charAt(i)!='.')
X-=widthAll;
else
X-=widthAll/5;
getPositions(X,Y);
convert(num.charAt(i));
draw(g);
}

} public void setBounds(int x,int y,int width,int height)
{
this.ComWidth=width;
this.ComHeight=height;
super.setBounds(x,y,width,height);
repaint();

}

public Dimension getMinimumSize()
{
return new Dimension(ComWidth,ComHeight);
}

public Dimension getPreferredSize()
{
return new Dimension(ComWidth,ComHeight);
}

private void convert(char a){
switch(a){
case '0':
for(int i=0;i<8;i++) style[i]=1;
style[6]=style[7]=0;
break;
case '1':
for(int i=0;i<8;i++) style[i]=0;
style[1]=style[2]=1;
style[7]=0;
break;
case '2':
for(int i=0;i<8;i++) style[i]=1;
style[5]=style[2]=style[7]=0;
break;
case '3':
for(int i=0;i<8;i++) style[i]=1;
style[4]=style[5]=style[7]=0;
break;
case '4':
for(int i=0;i<8;i++) style[i]=1;
style[0]=style[3]=style[4]=style[7]=0;
break;
case '5':
for(int i=0;i<8;i++) style[i]=1;
style[1]=style[4]=style[7]=0;
break;
case '6':
for(int i=0;i<8;i++) style[i]=1;
style[1]=style[7]=0;
break;
case '7':
for(int i=0;i<8;i++) style[i]=0;
style[0]=style[1]=style[2]=1;
style[7]=0;
break;
case '8':
for(int i=0;i<8;i++) style[i]=1;
style[7]=0;
break;
case '9':
for(int i=0;i<8;i++) style[i]=1;
style[4]=style[7]=0;
break;
case '.':
for(int i=0;i<8;i++) style[i]=0;
style[7]=1;
break;
case '-':
for(int i=0;i<8;i++) style[i]=0;
style[6]=1;
break;
default:
for(int i=0;i<8;i++) style[i]=1;
style[1]=style[2]=0;
break;
}
}
private void getPositions(int a,int b){
x[0]=a;
y[0]=b+5*height/232;
x[1]=x[0]+26*width/139;
y[1]=y[0]+26*height/232;
x[2]=x[1];
    y[2]=y[1]+67*height/232;
x[3]=x[2]-15*width/139;
    y[3]=y[2]+15*height/232;
x[4]=a;
y[4]=y[0]+96*height/232;
///////////////////////
x1[0]=x[0]+5*width/139;
y1[0]=y[0]-5*height/232;
x1[1]=x1[0]+127*width/139;
y1[1]=y1[0];
x1[2]=x1[1]-26*width/139;
y1[2]=y1[1]+26*height/232;
x1[3]=x[0]+31*width/139;
y1[3]=y1[0]+26*height/232;
/////////////////////////
x2[0]=x1[2]+5*width/139;
y2[0]=y1[2]+5*height/232;
x2[1]=x2[0]+26*width/139;
y2[1]=y2[0]-26*height/232;
x2[2]=x2[1];
y2[2]=y2[1]+96*height/232;
x2[3]=x2[2]-8*width/139;
y2[3]=y[2]+15*height/232;
x2[4]=x2[0];
y2[4]=y2[0]+67*height/232;
//////////////////////////
x3[0]=x[1];
y3[0]=y[2]+8*height/232;
x3[1]=x3[0]+86*width/139;
y3[1]=y3[0];
x3[2]=x3[1]+12*width/139;
y3[2]=y3[1]+12*height/232;
x3[3]=x3[2]-12*width/139;
y3[3]=y3[2]+12*height/232;
x3[4]=x3[3]-86*width/139;
y3[4]=y3[3];
x3[5]=x3[4]-12*width/139;
y3[5]=y3[3]-12*height/232;
//////////////////////////
x4[0]=x3[4];
y4[0]=y3[4]+8*height/232;
x4[1]=x3[4];
y4[1]=y4[0]+67*height/232;
x4[2]=x4[1]-26*width/139;
y4[2]=y4[1]+26*height/232;
x4[3]=x4[2];
y4[3]=y4[2]-96*height/232;
x4[4]=x4[3]+12*width/139;
y4[4]=y4[3]-11*height/232;
////////////////////////////
x5[0]=x4[1]+5*width/139;;
y5[0]=y4[1]+5*height/232;
x5[1]=x5[0]+80*width/139;
y5[1]=y5[0];
x5[2]=x5[1]+26*width/139;
y5[2]=y5[1]+26*height/232;
x5[3]=x5[0]-26*width/139;
y5[3]=y5[0]+26*height/232;
///////////////////////////
x6[0]=x2[3];
y6[0]=y2[3]+8*height/232;
x6[1]=x6[0]+10*width/139;
y6[1]=y6[0]+10*height/232;
x6[2]=x6[1];
y6[2]=y6[1]+96*height/232;
x6[3]=x6[2]-26*width/139;
y6[3]=y6[2]-26*height/232;
x6[4]=x6[3];
y6[4]=y3[4]+8*height/232;
}

private void draw(Graphics g){
if(style[5]==1){
Polygon p1=new Polygon(x,y,5);
g.drawPolygon(p1);
g.setColor(Color.red);
g.fillPolygon(p1);
}

if(style[0]==1){
Polygon p2=new Polygon(x1,y1,4);
g.drawPolygon(p2);
g.setColor(Color.RED);
g.fillPolygon(p2);
}

if(style[1]==1){
Polygon p3=new Polygon(x2,y2,5);
g.drawPolygon(p3);
g.setColor(Color.RED);
g.fillPolygon(p3);
}

if(style[6]==1){
Polygon p4=new Polygon(x3,y3,6);
g.drawPolygon(p4);
g.setColor(Color.RED);
g.fillPolygon(p4);
}

if(style[4]==1){
Polygon p5=new Polygon(x4,y4,5);
g.drawPolygon(p5);
g.setColor(Color.RED);
g.fillPolygon(p5);
}

if(style[3]==1){
Polygon p6=new Polygon(x5,y5,4);
g.drawPolygon(p6);
g.setColor(Color.RED);
g.fillPolygon(p6);
}

if(style[2]==1){
Polygon p7=new Polygon(x6,y6,5);
g.drawPolygon(p7);
g.setColor(Color.RED);
g.fillPolygon(p7);

}

if(style[7]==1){
g.setColor(Color.RED);
g.fillOval(x[0],y[0]+7*height/8,width/6,height/8);
}
}    int[] x =new int[6];
    int[] y =new int[6];
    
    int[] x1 =new int[4];
    int[] y1 =new int[4];
    
    int[] x2=new int[5];
    int[] y2 =new int[5];
    
    int[] x3=new int[6];
    int[] y3 =new int[6];
    
    int[] x4=new int[5];
    int[] y4=new int[5];
    
    
    int[] x5 =new int[4];
    int[] y5 =new int[4];
    
    int[] x6 =new int[5];
    int[] y6 =new int[5];
}

Answer 11

帮你简单的改了一下，结构如果不合你要求自己再改改，意思就是这样的了。
你把显示数字的看成一个显示框就好了，不用太多的关心它，你的操作不是集中在这个上面的。
你的操作应该是如何处理输入，然后把结果显示给别人看就可以了。
如果你想结果自己改变，可以参考一下observer这种设计模式，时间问题就不多说了！
继续努力！

Answer 12

main和前面一样，下面帮我改一下（我改了，不能放大，放大后字户间坐标不对）。在main中能帮我写一下事件吗，就写个例子，比如button0的
下面的double number有值后就能显示。但我不知到，在main中怎样用他/
import java.awt.*;
import javax.swing.*;
import java.text.*;public class SevenDigitalDemo extends JPanel 
{ Polygon p1,p2,p3,p4,p5,p6,p7;
Dimension tsize;
//private int X=0,Y=0;
private int ComWidth=232,ComHeight=139;

private int width =ComWidth/6,height = ComHeight*4/6,a,b;
String num="0";
private int style[]=new int[8];
boolean []bIsShow=new boolean[8];
DecimalFormat fmt=new DecimalFormat("####.###############");
double number;
    
    
public SevenDigitalDemo()
{
 this.setMinimumSize(new Dimension(ComWidth,ComHeight));
     this.setPreferredSize(new Dimension(ComWidth,ComHeight));
      //enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
}


public void setNumber(double a)
{
number=a;


}
public  void getPosition(int a,int b)
{   //super.paint(g) ; x[0]=a;
y[0]=b+12;//+5*height/232;
x[1]=x[0]+26*width/139;
y[1]=y[0]+26*height/232;
x[2]=x[1];
    y[2]=y[1]+67*height/232;
x[3]=x[2]-15*width/139;
    y[3]=y[2]+15*height/232;
x[4]=a;
y[4]=y[0]+96*height/232;
p1=new Polygon(x,y,5);

//////////////////////////////////////////////
    x1[0]=x[0]+5*width/139;
y1[0]=y[0]-5*height/232;
x1[1]=x1[0]+127*width/139;
y1[1]=y1[0];
x1[2]=x1[1]-26*width/139;
y1[2]=y1[1]+26*height/232;
x1[3]=x[0]+31*width/139;
y1[3]=y1[0]+26*height/232;
p2=new Polygon(x1,y1,4);

///////////////////////////////////////////////////
x2[0]=x1[2]+5*width/139;
y2[0]=y1[2]+5*height/232;
x2[1]=x2[0]+26*width/139;
y2[1]=y2[0]-26*height/232;
x2[2]=x2[1];
y2[2]=y2[1]+96*height/232;
x2[3]=x2[2]-8*width/139;
y2[3]=y[2]+15*height/232;
x2[4]=x2[0];
y2[4]=y2[0]+67*height/232;
p3=new Polygon(x2,y2,5);

//////////////////////////////////////////////////////
x3[0]=x[1];
y3[0]=y[2]+8*height/232;
x3[1]=x3[0]+86*width/139;
y3[1]=y3[0];
x3[2]=x3[1]+12*width/139;
y3[2]=y3[1]+12*height/232;
x3[3]=x3[2]-12*width/139;
y3[3]=y3[2]+12*height/232;
x3[4]=x3[3]-86*width/139;
y3[4]=y3[3];
x3[5]=x3[4]-12*width/139;
y3[5]=y3[3]-12*height/232;
        p4=new Polygon(x3,y3,6);

//////////////////////////////////////////////////////////
x4[0]=x3[4];
y4[0]=y3[4]+8*height/232;
x4[1]=x3[4];
y4[1]=y4[0]+67*height/232;
x4[2]=x4[1]-26*width/139;
y4[2]=y4[1]+26*height/232;
x4[3]=x4[2];
y4[3]=y4[2]-96*height/232;
    x4[4]=x4[3]+12*width/139;
y4[4]=y4[3]-11*height/232;
p5=new Polygon(x4,y4,5);


///////////////////////////////////////////////
x5[0]=x4[1]+5*width/139;;
y5[0]=y4[1]+5*height/232;
x5[1]=x5[0]+80*width/139;
y5[1]=y5[0];
x5[2]=x5[1]+26*width/139;
y5[2]=y5[1]+26*height/232;
x5[3]=x5[0]-26*width/139;
y5[3]=y5[0]+26*height/232;
p6=new Polygon(x5,y5,4);


//////////////////////////////////////////////////////

x6[0]=x2[3];
y6[0]=y2[3]+8*height/232;
x6[1]=x6[0]+10*width/139;
y6[1]=y6[0]+10*height/232;
x6[2]=x6[1];
y6[2]=y6[1]+96*height/232;
x6[3]=x6[2]-26*width/139;
y6[3]=y6[2]-26*height/232;
    x6[4]=x6[3];
y6[4]=y3[4]+8*height/232;
p7=new Polygon(x6,y6,5);

} public void setBooleanNumber(char  a)
   { 
    if(a=='0')
    {
    bIsShow[0]=true;
    bIsShow[1]=true;
    bIsShow[2]=true;
    bIsShow[3]=false;
    bIsShow[4]=true;
    bIsShow[5]=true;
    bIsShow[6]=true;
    bIsShow[7]=true;    }
    else if(a=='1')
    {
    bIsShow[0]=false;
    bIsShow[1]=false;
    bIsShow[2]=true;
    bIsShow[3]=false;
    bIsShow[4]=false;
    bIsShow[5]=false;
    bIsShow[6]=true;
    bIsShow[7]=false;    }
    else if(a=='2')
    {
    bIsShow[0]=false;
    bIsShow[1]=true;
    bIsShow[2]=true;
    bIsShow[3]=true;
    bIsShow[4]=true;
    bIsShow[5]=true;
    bIsShow[6]=false;
    bIsShow[7]=true;    }
    else if(a=='3')
    {
    bIsShow[0]=false;
    bIsShow[1]=true;
    bIsShow[2]=true;
    bIsShow[3]=true;
    bIsShow[4]=false;
    bIsShow[5]=true;
    bIsShow[6]=true;
    bIsShow[7]=true;
      
    }
    else if(a=='4')
    {
    bIsShow[0]=true;
    bIsShow[1]=false;
    bIsShow[2]=true;
    bIsShow[3]=true;
    bIsShow[4]=false;
    bIsShow[5]=false;
    bIsShow[6]=true;
    bIsShow[7]=true;
  
    }
    else if(a=='5')
    {
    bIsShow[0]=true;
    bIsShow[1]=true;
    bIsShow[2]=false;
    bIsShow[3]=true;
    bIsShow[4]=false;
    bIsShow[5]=true;
    bIsShow[6]=true;
    bIsShow[7]=true;
      
    }
    else if(a=='6')
    {
    bIsShow[0]=true;
    bIsShow[1]=true;
    bIsShow[2]=false;
    bIsShow[3]=true;
    bIsShow[4]=true;
    bIsShow[5]=true;
    bIsShow[6]=true;
    bIsShow[7]=true;
     
    }
    else if(a=='7')
    {
    bIsShow[0]=false;
    bIsShow[1]=true;
    bIsShow[2]=true;
    bIsShow[3]=false;
    bIsShow[4]=false;
    bIsShow[5]=false;
    bIsShow[6]=true;
    bIsShow[7]=false;
       
    }
    else if(a=='8')
    {
    bIsShow[0]=true;
    bIsShow[1]=true;
    bIsShow[2]=true;
    bIsShow[3]=true;
    bIsShow[4]=true;
    bIsShow[5]=true;
    bIsShow[6]=true;
    bIsShow[7]=true;
    
    }
    else if(a=='9')
    {
    bIsShow[0]=true;
    bIsShow[1]=true;
    bIsShow[2]=true;
    bIsShow[3]=true;
    bIsShow[4]=false;
    bIsShow[5]=true;
    bIsShow[6]=true;
    bIsShow[7]=true;
    }
    else if(a=='-')
    {
    bIsShow[0]=false;
    bIsShow[1]=false;
    bIsShow[2]=false;
    bIsShow[3]=true;
    bIsShow[4]=false;
    bIsShow[5]=false;
    bIsShow[6]=false;
    bIsShow[7]=false;
    }
    else if(a=='.')
    {
    bIsShow[0]=false;
    bIsShow[1]=false;
    bIsShow[2]=false;
    bIsShow[3]=false;
    bIsShow[4]=false;
    bIsShow[5]=false;
    bIsShow[6]=false;
    bIsShow[7]=false;
    }
   
    }
    
   

Answer 13

public void paintComponent(Graphics g)
{

    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    g2.setColor(Color.red);
    
    //tsize=getSize();
        //g.setColor(getBackground());
        //g.fillRect(0, 0, ComWidth, ComWidth);
        //g.setColor(getForeground());
        StringBuffer sb = new StringBuffer(new Double(number).toString());
        char c;
        int a = ComWidth/500;
        int b = 0;
        for(int i=0;i<sb.length();i++)
        {
        c = sb.charAt(i);
        getPosition(a,b);
        //sb.deleteCharAt(i);
        setBooleanNumber(c);
if(bIsShow[0])
g2.fillPolygon(p1);

if(bIsShow[1])
g2.fillPolygon(p2);

if(bIsShow[2])
g2.fillPolygon(p3);

    if(bIsShow[3])
g2.fillPolygon(p4);

if(bIsShow[4])
g2.fillPolygon(p5);

if(bIsShow[5])
g2.fillPolygon(p6);

if(bIsShow[6])
g2.fillPolygon(p7);
    if(!bIsShow[0]&&!bIsShow[1]&&!bIsShow[2]&&!bIsShow[3]&&!bIsShow[4]&&!bIsShow[5]&&!bIsShow[6]&&!bIsShow[7])
        g2.fillOval(x[0],y[0]+7*height/8,width/6,height/8);

    if(c=='.')
        a=a+ComWidth/40;
        else
        a=a+ComWidth/12;
}

}
/*
for(int i=0;i<num.length();i++)
{      width=tsize.width;
      height=tsize.height;
      width=tsize.width/6;
      height=tsize.height*5/6;
  a=tsize.width/40;
      b=tsize.height/10;
  CoordinateHandling (a,b);
 
}*/
   public void setBounds(int x,int y,int width,int height)
{
this.ComWidth=width;
this.ComHeight=height;
super.setBounds(x,y,width,height);
repaint();
}public Dimension getMinimumSize()
{
   return new Dimension(ComWidth,ComHeight);
}public Dimension getPreferredSize()
{
return new Dimension(ComWidth,ComHeight);
}
    int[] x =new int[5];
    int[] y =new int[5];
    
    int[] x1 =new int[4];
    int[] y1 =new int[4];
    
    int[] x2=new int[5];
    int[] y2 =new int[5];
    
    int[] x3=new int[6];
    int[] y3 =new int[6];
    
    int[] x4=new int[5];
    int[] y4=new int[5];
    
    
    int[] x5 =new int[4];
    int[] y5 =new int[4];
    
    int[] x6 =new int[5];
    int[] y6 =new int[5];
    }

Answer 14

我改了成这样，行了。我按下按钮能显示了，我忘了用repaint()下面对吗。你把button0的事件写给我看一下。
public  void actionPerformed(ActionEvent e)
{
if (e.getSource()==button0)
{

panel1.setNumber(23233223);
repaint();
        
}
if (e.getSource()==button1)
{

panel1.setNumber(1);
repaint();
        
}


}

Answer 15

你把repaint()放到setNum()函数里面去，那样就不用你写repaint()了。怎么处理输入信息里面也给你说了一下。大体上框架可以用你现在的样子，只要在设置setNum处理一下就好了。

Answer 16

setNum(String s){
    number=a;
    repaint();
}
setNum之前处理一下
if(e.getSource()==button0){
    //把0加入输入字符串s
    panel1.setNumber(s);
}