求教java中的drawString()方法
这个程序代码为什么只显示窗口，而不显示字符串呢？

import javax.swing.*;
import java.awt.*;
class DrawPanel extends JPanel
{
public void painComponent(Graphics g)
{
g.drawString("Hello,world",75,100);
}
}
class DrawFrame extends JFrame
{
public DrawFrame()
{
setTitle("Hello,world");
setSize(300,200);
DrawPanel panel=new DrawPanel();
add(panel);
}
}
public class Test
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
DrawFrame frame=new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
求教！！！
新手
[最优解释]
painComponent
=> paintComponent

在方法前加上 @Override 可以避免这类错误。
[其他解释]
import javax.swing.*;
import java.awt.*;
class DrawPanel extends JPanel
{
public void painComponent(Graphics g)
{
g.drawString("Hello,world",75,100);
}
}
class DrawFrame extends JFrame
{
public DrawFrame()
{
setTitle("Hello,world");
setSize(300,200);
DrawPanel panel=new DrawPanel();
add(panel);
}
}
public class Test
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
DrawFrame frame=new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}

});
}
}

[其他解释]
大牛们，快99我吧，困扰好几天了
[其他解释]
嗯。谢谢！就是这个原因