📌  相关文章
📜  Java MouseListener接口

📅  最后修改于: 2020-09-29 01:24:31             🧑  作者: Mango

Java MouseListener接口

每当您更改鼠标状态时，都会通知Java MouseListener。会根据MouseEvent进行通知。 MouseListener接口可在java.awt.event包中找到。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：

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();
}
}

输出：