直接上代码
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Graphics;
public class DrawRectangles extends JFrame{
public DrawRectangles(){
setTitle("DrawRectangles");
getContentPane().add(new RectPanel());
}
public static void main(String[] args){
DrawRectangles frame = new DrawRectangles();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(450,250);
frame.setSize(300,250);
frame.setVisible(true);
}
}
class RectPanel extends JPanel{
protected void panitCompoment(Graphics g){
super.paintComponent(g);
g.setColor(Color.red);
g.drawRect(5, 5, getWidth()/2-10, getHeight()/2-10);
g.drawRoundRect(getWidth()/2+5, 5, getWidth()/2-10, getHeight()/2-10,60,30);
g.setColor(Color.cyan);
g.fill3DRect(5, getHeight()/2+5, getWidth()/2-10, getHeight()/2-10, true);
g.fill3DRect(getWidth()/2+5, getHeight()/2+5, getWidth()/2-10, getHeight()/2-10, false);
g.dispose();
}
}
各位高手，怎么在窗口中不能显示矩形啊？谢谢各位诚心的解答啊........
------解决方案--------------------
JPanel重新的方法不对
- Java code
import javax.swing.JFrame;import javax.swing.JPanel;import java.awt.Color;import java.awt.Graphics;public class DrawRectangles extends JFrame{ public DrawRectangles(){ setTitle("DrawRectangles"); getContentPane().add(new RectPanel()); } public static void main(String[] args){ DrawRectangles frame = new DrawRectangles(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocation(450,250); frame.setSize(300,250); frame.setVisible(true); }}class RectPanel extends JPanel{ @Override public void paint(Graphics g){ super.paint(g); g.setColor(Color.red); g.drawRect(5, 5, getWidth()/2-10, getHeight()/2-10); g.drawRoundRect(getWidth()/2+5, 5, getWidth()/2-10, getHeight()/2-10,60,30); g.setColor(Color.cyan); g.fill3DRect(5, getHeight()/2+5, getWidth()/2-10, getHeight()/2-10, true); g.fill3DRect(getWidth()/2+5, getHeight()/2+5, getWidth()/2-10, getHeight()/2-10, false);// g.dispose(); }}