这是类:package windows;
import javax.swing.*;
import java.awt.*;
/**
*
* @author Administrator
*/
public class color {
private int wight;
private int height;
private int x;
private int y;
private JFrame widow;
private Color color;public color()
{
widow=new JFrame("box");
widow.setSize(200,200);wight=40;
height=20;
x=80;
y=90;
color=Color.black;
widow.setVisible(true);
}
public void paint()
{ Graphics g=widow.getGraphics();
g.setColor(color);
g.fillRect(wight,height,x,y);
}
}这是主程序:
package windows;import javax.swing.*;
import java.awt.*;
import java.io.*;public class Main { public static void main(String[] args)throws IOException {
color c1=new color();
color c2=new color(); c1.paint();
c2.paint();
}
}为什么不能在我构建的矩形中打印有颜色的矩形呢 谁来告诉我一下 谢谢了
import javax.swing.*;
import java.awt.*;
/**
*
* @author Administrator
*/
public class color {
private int wight;
private int height;
private int x;
private int y;
private JFrame widow;
private Color color;public color()
{
widow=new JFrame("box");
widow.setSize(200,200);wight=40;
height=20;
x=80;
y=90;
color=Color.black;
widow.setVisible(true);
}
public void paint()
{ Graphics g=widow.getGraphics();
g.setColor(color);
g.fillRect(wight,height,x,y);
}
}这是主程序:
package windows;import javax.swing.*;
import java.awt.*;
import java.io.*;public class Main { public static void main(String[] args)throws IOException {
color c1=new color();
color c2=new color(); c1.paint();
c2.paint();
}
}为什么不能在我构建的矩形中打印有颜色的矩形呢 谁来告诉我一下 谢谢了
{
g.setColor(color);
g.fillRect(wight,height,x,y);
}
} 建议你的weight,height还有color都换一个名字,一面和java api中的命名冲突
widow.setSize(200,200);
我看这个 widow 有问题 是window吧
还是多看看例子程序吧。这样就不会写出这么奇怪的代码了。
1.类名:每个单词首字母大写。
2.变量和方法:第一个单词小写,后面每个单词的首字母大写。
3.包名:全部小写。
4.常量:全部大写。
import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.awt.geom.*;
/**
*
* @author Administrator
*/
class colorFrame extends JFrame{
public colorFrame(Color c){
setSize(width,height);
recttanglePanel rp=new recttanglePanel(c);
Container contentpane=getContentPane();
contentpane.add(rp);
}
private static final int width=200;
private static final int height=300;}
class recttanglePanel extends JPanel{
private Color c;
public recttanglePanel(Color c){
this.c=c;
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
double leftx=20;
double topy=30;
double height=50;
double width=50;
Rectangle2D rect=new Rectangle2D.Double(leftx,topy,width,height);
g2.setPaint(c);
g2.fill(rect);
}
}public class java { public static void main(String[] args)throws IOException {
colorFrame cf=new colorFrame(Color.cyan);
cf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
cf.setVisible(true);
}
}
创建一个java.java的文件
把代码粘进去,运行一下。