import java.awt.*;
import java.awt.event.*;
public class drowline{
Frame f=new Frame( "画线 ");
f.addWindowListener(new MyWindowListener());
public static void main (String [] args){
new drowline().init();
}
public void init(){
f.setSize(300,300);
f.setVisible(true);
f.addMouseListener( new MouseAdapter()
{int x;
int y;
public void mousePressed(MouseEvent e){
x=e.getX();
y=e.getY();
}
public void mouseReleased (MouseEvent e){
f.getGraphics().setColor(Color.blue);
f.getGraphics().drawLine(x,y,e.getX(),e.getY());
}
});
}
}
class MyWindowListener implements WindowListener {
public void windowClosing(WindowEvent e){
e.getWindow().setVisible(false);
System.exit(0);
}
public void windowActivated(WindowEvent e){
}
public void windowClosed(WindowEvent e){
}
public void windowDeactivated(WindowEvent e){
}
public void windowDeiconified(WindowEvent e){
}
public void windowIconified(WindowEvent e){
}
public void windowOpened(WindowEvent e){
}
}
E:\ysheny\study\java\javap\drowline.java:5: <identifier> expected
f.addWindowListener(new MyWindowListener());
^
1 error
谢谢 我是刚接触java
------解决方案--------------------
新建一个MyWindowListener类，然后引入到drowline中
例：import com.MyWindowListener
------解决方案--------------------
把f.addWindowListener(new MyWindowListener());放到init里
------解决方案--------------------
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