btok.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
now-=Integer.parseInt(tf.getText());
}
解释btok是一个按钮控件,tf是一个文本输入控件,now是类的成员变量int类型,但
触发按钮后,在我重载的Paint函数中,要用到这个变量,
public void paint(Graphics g){
System.out.println(now);
}
但始终是0.
不解中
请各位高手帮忙解答下
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public void paint(Graphics g){
System.out.println(now);
} 这句执行是在按钮触发之前执行,还是之后?
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;public class Assign extends JFrame{
private JLabel lb1;
private JLabel lb2;
private JTextField tf1;
private JTextField tf2;
private JButton btok1;
private JButton btok2;
int now=0;
public void launchFrame() {
lb1=new JLabel("分配:");
Container c=this.getContentPane();
c.setLayout(new FlowLayout());
c.add(lb1);
tf1=new JTextField(2);
c.add(tf1);
btok1=new JButton("ok");
c.add(btok1);
btok1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
now+=Integer.parseInt(tf1.getText());
}
});
lb2=new JLabel("释放:");
c.add(lb2);
tf2=new JTextField(2);
c.add(tf2);
btok2=new JButton("ok");
c.add(btok2);
btok2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
now-=Integer.parseInt(tf2.getText());
}
}
);
this.setBounds(0, 0, 300, 350);
this.setVisible(true);
this.setResizable(false);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
} public static void main(String[] args) {
// TODO Auto-generated method stub
Assign a=new Assign();
a.launchFrame();
}
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.black);
int k=0;
for(int j=0;j<9;j++)
for(int i=0;i<9;i++)
{
k++;
if(k<=now)
g.fill3DRect(15+30*i, 70+j*30, 30, 30,true);
else
g.draw3DRect(15+30*i, 70+j*30, 30, 30,true);
}
}}
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent; import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField; public class Assign extends JFrame{
private JLabel lb1;
private JLabel lb2;
private JTextField tf1;
private JTextField tf2;
private JButton btok1;
private JButton btok2; int now=0;
public void launchFrame() {
lb1=new JLabel("分配:");
Container c=this.getContentPane();
c.setLayout(new FlowLayout());
c.add(lb1);
tf1=new JTextField(2);
c.add(tf1);
btok1=new JButton("ok");
c.add(btok1);
btok1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { now+=Integer.parseInt(tf1.getText());
System.out.println(now);
repaint();
}
}); lb2=new JLabel("释放:");
c.add(lb2);
tf2=new JTextField(2);
c.add(tf2);
btok2=new JButton("ok");
c.add(btok2);
btok2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) { now-=Integer.parseInt(tf2.getText());
repaint();}
}
); this.setBounds(0, 0, 300, 350);
this.setVisible(true);
this.setResizable(false);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}); } public static void main(String[] args) {
// TODO Auto-generated method stub
Assign a=new Assign();
a.launchFrame();
}
public void paint(Graphics g) {
System.out.println("sdf" + now);
super.paint(g);
g.setColor(Color.black);
int k=0;
for(int j=0;j <9;j++)
for(int i=0;i <9;i++)
{
k++;
if(k <=now)
g.fill3DRect(15+30*i, 70+j*30, 30, 30,true);
else
g.draw3DRect(15+30*i, 70+j*30, 30, 30,true);
}
} }