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import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Toolkit;
import javax.swing.JFrame;
public class MainFrame extends JFrame{
public MainFrame(){
setTitle("");
Container count=getContentPane();
count.setLayout(null);
setSize(500,350);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension scr = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frm = this.getSize();
setLocation( (scr.width - frm.width) / 2,
(scr.height - frm.height) / 2 );//设置窗体居中
setVisible(true);
}
public void paint(Graphics g){
g.setColor(Color.black);
g.drawString("hello,september", 100, 200);
g.drawLine(300, 50, 300, 200);
}
public static void main(String[] args){
new MainFrame();
}
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
new MainFrame();
}
});
}