Question

请教关于paintComponent方法

Answer 1

import java.awt.Graphics;

import javax.swing.*;

public class TestPaintComponent extends JFrame {
public TestPaintComponent(){
add(new NewLabel("Banner"));
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
TestPaintComponent frame = new TestPaintComponent();
frame.setTitle("TestPaintCompinent");
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300,200);
frame.setVisible(true);

}
}

class NewLabel extends JLabel {
public NewLabel(String text){
super(text);

}
protected void painComponent(Graphics g){
super.paintComponent(g);
g.drawLine(0, 0, 50, 50);
}
}