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下面程序为何编译不通过?请高手帮帮忙,多谢!
来源: 互联网 发布时间：2015-04-05
本文导语: import java.awt.*; import java.awt.event.*; public class TwoListener implements MouseMotionListener,MouseListener{ private Frame f; private TextField tf; public TwoListener(){ f=new Frame("Two listeners example"); tf=new TextField(30); } public void launchFr...
import java.awt.*;
import java.awt.event.*;
public class TwoListener implements MouseMotionListener,MouseListener{
private Frame f;
private TextField tf;
public TwoListener(){
f=new Frame("Two listeners example");
tf=new TextField(30);
}
public void launchFrame(){
Label label=new Label("Click and drag the mouse");
f.add(label,BorderLayout.NORTH);
f.add(tf,BorderLayout.SOUTH);
f.addMouseMotionListener(this);
f.addMouseListener(this);
f.setSize(300,200);
f.setVisible(true);
}
public void mouseDragged(MouseEvent e){
String s="Mouse dragging: X="+e.getX()+"Y= "+e.getY();
tf.setText(s);
}
public void mouseEntered(MouseEvent e){
String s="The mouse entered";
tf.setText(s);
}
public void mouseExited(MouseEvent e){
String s="The mouse has left the building";
tf.setText(s);
}
public void mousePressed(MouseEvent e){}
public void mouseClicked(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
public static void main(String args[]){
TwoListener two=new TwoListener();
two.launchFrame();
}
}
import java.awt.event.*;
public class TwoListener implements MouseMotionListener,MouseListener{
private Frame f;
private TextField tf;
public TwoListener(){
f=new Frame("Two listeners example");
tf=new TextField(30);
}
public void launchFrame(){
Label label=new Label("Click and drag the mouse");
f.add(label,BorderLayout.NORTH);
f.add(tf,BorderLayout.SOUTH);
f.addMouseMotionListener(this);
f.addMouseListener(this);
f.setSize(300,200);
f.setVisible(true);
}
public void mouseDragged(MouseEvent e){
String s="Mouse dragging: X="+e.getX()+"Y= "+e.getY();
tf.setText(s);
}
public void mouseEntered(MouseEvent e){
String s="The mouse entered";
tf.setText(s);
}
public void mouseExited(MouseEvent e){
String s="The mouse has left the building";
tf.setText(s);
}
public void mousePressed(MouseEvent e){}
public void mouseClicked(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
public static void main(String args[]){
TwoListener two=new TwoListener();
two.launchFrame();
}
}
|
mouseMove函数没有在你自己的类中重写。它是MouseListener接口的方法。必须重写。
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