Java MouseListener接口 _JavaMouseListener接口

本文概述

MouseListener接口的方法
Java MouseListener示例
Java MouseListener示例2

每当你更改鼠标状态时, 都会通知Java MouseListener。根据MouseEvent进行通知。可在java.awt.event包中找到MouseListener接口。它有五种方法。
MouseListener接口的方法在MouseListener界面中找到的5种方法的签名如下：

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(); } }

输出：

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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(); } }

【Java MouseListener接口】输出：