本文概述

每當(dāng)你更改鼠標(biāo)狀態(tài)時(shí), 都會(huì)通知Java MouseListener。根據(jù)MouseEvent進(jìn)行通知。可在java.awt.event包中找到MouseListener接口。它有五種方法。

MouseListener接口的方法

在MouseListener界面中找到的5種方法的簽名如下：

public abstract void mouseClicked(MouseEvent e);

public abstract void mouseEntered(MouseEvent e);

public abstract void mouseExited(MouseEvent e);

public abstract void mousePressed(MouseEvent e);

public abstract void mouseReleased(MouseEvent e);

Java MouseListener示例

import java.awt.*;

import java.awt.event.*;

public class MouseListenerExample extends Frame implements MouseListener{

Label l;

MouseListenerExample(){

addMouseListener(this);

l=new Label();

l.setBounds(20, 50, 100, 20);

add(l);

setSize(300, 300);

setLayout(null);

setVisible(true);

}

public void mouseClicked(MouseEvent e) {

l.setText("Mouse Clicked");

}

public void mouseEntered(MouseEvent e) {

l.setText("Mouse Entered");

}

public void mouseExited(MouseEvent e) {

l.setText("Mouse Exited");

}

public void mousePressed(MouseEvent e) {

l.setText("Mouse Pressed");

}

public void mouseReleased(MouseEvent e) {

l.setText("Mouse Released");

}

public static void main(String[] args) {

new MouseListenerExample();

}

}

輸出：

Java MouseListener示例2

import java.awt.*;

import java.awt.event.*;

public class MouseListenerExample2 extends Frame implements MouseListener{

MouseListenerExample2(){

addMouseListener(this);

setSize(300, 300);

setLayout(null);

setVisible(true);

}

public void mouseClicked(MouseEvent e) {

Graphics g=getGraphics();

g.setColor(Color.BLUE);

g.fillOval(e.getX(), e.getY(), 30, 30);

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

public static void main(String[] args) {

new MouseListenerExample2();

}

}

輸出：

總結(jié)

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