JAVA 如何清空或删除Canvas里的内容
------解决方案--------------------
那给你一个例子吧
是清除JPanel的内容
和Canvas道理一样
一个面板上有字符串"HELLOWORLD!"
点击鼠标内容清除
调用repaint()如最小化再恢复
则字符串又显示
- Java code
import java.awt.*;import java.awt.event.*;import javax.swing.*;public class TT{ public static void main(String[] args) { MFrame m = new MFrame(); m.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); m.setVisible(true); }}class MFrame extends JFrame{ public static final int Default_Width = 200; public static final int Default_Height = 200; public MFrame() { setBounds(100, 100, Default_Width, Default_Height); Container con = getContentPane(); MPanel p = new MPanel(); con.add(p); }}class MPanel extends JPanel{ public MPanel() { addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) {clearPanel();} }); } public void paintComponent(Graphics g) { super.paintComponent(g); g.drawString("HELLO WORLD!",30,30); } public void clearPanel() { Graphics g = getGraphics(); int width = (int)(getBounds().getWidth()); int height = (int)(getBounds().getHeight()); g.clearRect(0, 0, width, height); }}