swing

Question

swing： 程序运行后只显示一个jframe，只有将窗口最小化再最大化后才会显示jframe上的内容，该怎么解决呢？

[b]问题补充：[/b]
能说得再具体点不？
[b]问题补充：[/b]
uiupdate是哪里的类？
[b]问题补充：[/b]
[code="java"]package print;

import java.awt.*;
import java.util.List;

import javax.swing.*;

public class MyFrame {

private static final int WIDTH = 700;
private static final int HEIGHT = 500;
JPanel mainpanel = null;    //在框架上添加的主面板
JPanel downpanel = null;    //在主面板的下面的一个面板
public static UpRightPanel rightPanel ;

public MyFrame(){
    JFrame jf = new JFrame();
    jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jf.setSize(WIDTH, HEIGHT);
    jf.setVisible(true);
    jf.setResizable(false);

    //设置顶层框架居中显示
    Toolkit kit = Toolkit.getDefaultToolkit();
    Dimension screenSize = kit.getScreenSize();
    int screenWidth = screenSize.width;
    int screenHeight = screenSize.height;
    int x = (screenWidth - WIDTH)/2;
    int y = (screenHeight - HEIGHT)/2;
    jf.setLocation(x, y);

    GridLayout lay = new GridLayout(2,1);
    //jf.setLayout(lay);

    mainpanel = new JPanel();
    mainpanel.setBackground(new Color(220,220,200));
    jf.add(mainpanel);
    mainpanel.setLayout(new FlowLayout(FlowLayout.LEFT));

    UpLeftPanel upanel = new UpLeftPanel();
    mainpanel.add(upanel);

    UpCenterPanel centerPanel = new UpCenterPanel();
    mainpanel.add(centerPanel);

    UpRightPanel rightPanel = new UpRightPanel();
    mainpanel.add(rightPanel);

    DownPanel downPanel = new DownPanel();
    mainpanel.add(downPanel);

}

public MyFrame(List stus){
    JFrame jf = new JFrame();
    jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    jf.setSize(WIDTH, HEIGHT);
    jf.setVisible(true);
    jf.setResizable(false);

    //设置顶层框架居中显示
    Toolkit kit = Toolkit.getDefaultToolkit();
    Dimension screenSize = kit.getScreenSize();
    int screenWidth = screenSize.width;
    int screenHeight = screenSize.height;
    int x = (screenWidth - WIDTH)/2;
    int y = (screenHeight - HEIGHT)/2;
    jf.setLocation(x, y);

    GridLayout lay = new GridLayout(2,1);
    //jf.setLayout(lay);

    mainpanel = new JPanel();
    mainpanel.setBackground(new Color(220,220,200));
    jf.add(mainpanel);
    mainpanel.setLayout(new FlowLayout(FlowLayout.LEFT));

    //左上方的面板
    UpLeftPanel upanel = new UpLeftPanel();
    mainpanel.add(upanel);

    //中上方的面板
    UpCenterPanel centerPanel = new UpCenterPanel(stus);
    mainpanel.add(centerPanel);

    //右上方的面板类
    rightPanel = new UpRightPanel();
    mainpanel.add(rightPanel);

    DownPanel downPanel = new DownPanel();
    mainpanel.add(downPanel);
}

}
[/code]

Answer 1

将你的jf.setVisible(true); 这句放到最后执行，也就是你把所有的panel加进去后，整个jframe构造好了之后，在执行！