[code="java"]import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JFrame;
import java.awt.*;
public class Test{
public static void main(String[] args) {
Scanner Scr = new Scanner(System.in);
JButton Jbt = new JButton("OK");
JFrame Jfr = new JFrame();
Jfr.setSize(200, 200);
Jfr.setLocationRelativeTo(null);
Jfr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Jfr.setVisible(true);
Scr.nextLine();
Jfr.setSize(250, 250);
Jfr.repaint();
Scr.nextLine();
Jfr.add(Jbt, BorderLayout.CENTER);
Jfr.setSize(100, 100);
Jfr.repaint();
}
} [/code]
[size=x-large]也是没有问题的啊[/size]