程序正在编译并运行，但它不会在框架上显示任何空白屏幕。 我正在使用cardLayout为我的游戏制作主菜单，我为每个面板制作了不同的类，然后将它们添加到了Framelay的Framelayout中 请一些人请指出我正在做的错误我无法找到它.. 三江源
enter code here
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
public class MainMenu extends JFrame implements ActionListener{
static CardLayout cl2;
static JPanel cardPanel;
Name p1;
MainM p2;
Robot p3;
High p4;
Inst p5;
gamepanel gp;
public static int height;
public static int width;
public static void main(String args[]){
MainMenu cl = new MainMenu();
cl.What();
}
public void What() {
// get the screen size as a java dimension
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setLayout(new BorderLayout());
setTitle("EROBOT");
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
// get height, and width
height = screenSize.height ;
width = screenSize.width ;
// set the jframe height and width
setSize(new Dimension(width, height));
cardPanel = new JPanel();
p1= new Name();
p2= new MainM();
p3= new Robot();
p4= new High();
p5= new Inst();
gp= new gamepanel();
cl2 = new CardLayout();
cardPanel.setLayout(cl2);
cardPanel.add(p1, "name");
cardPanel.add(p2, "menu");
cardPanel.add(p3, "robo");
cardPanel.add(p4, "inst");
cardPanel.add(p5, "high");
cardPanel.add(gp, "start");
getContentPane().add(cardPanel);
//name
Name.done.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "menu" );
}
});
// Main
MainM.newg.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "start" );
}
});
MainM.high.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "high" );
}
});
MainM.robo.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "robo" );
}
});
MainM.inst.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "inst" );
}
});
/////////////////////
//Robot
Robot.go.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "start" );
}
});
Robot.back1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "menu" );
}
});
//high score
High.back2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "menu" );
}
});
//how to play
Inst.back.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl2.show(cardPanel, "menu" );
}
});
}
public void actionPerformed(ActionEvent e){}
}
class Name extends JPanel{
JLabel enter;
static JButton done;
JTextField name;
JPanel side;
JPanel up;
JLabel title;
Name(){
Color h3= new Color(255,229,204);
side= new JPanel();
up= new JPanel();
setLayout(null);
MainMenu mm= new MainMenu();
setBackground(h3);
title = new JLabel("E-ROBOT");
title.setFont(new Font("Ravie", Font.PLAIN, 40)); //setting the style and the font of JLabel
title.setBounds(520, 100, 300, 50);
enter= new JLabel("ENTER YOUR NAME HERE");
enter.setFont(new Font("Ravie", Font.PLAIN, 20));
enter.setForeground(Color.orange);
enter.setBounds(370, 200, 350, 50);
name = new JTextField();
name.setBounds(390, 250, 150, 25);
done= new JButton("DONE");
done.setFont(new Font("Ravie", Font.PLAIN, 20));
done.setForeground(Color.orange);
done.setBackground(Color.YELLOW);
done.setOpaque(false);
done.setBorder(null);
done.setBounds(400, 280, 150, 30);
side.setBounds(0,40,mm.width,60);
up.setBounds(40,0,40,mm.height);
side.setBackground(Color.ORANGE);
up.setBackground(Color.ORANGE);
side.add(title);
add(enter);
add(name);
add(done);
add(side);
add(up);
}
}
class MainM extends JPanel{
JPanel l1;
JPanel l2;
JPanel l3;
JPanel l4;
JPanel contain;
JPanel side1;
JPanel up1;
static JButton newg;
static JButton high;
static JButton robo;
static JButton inst;
JLabel title;
MainM(){
MainMenu mm= new MainMenu();
Color h3= new Color(255,229,204);
setBackground(h3);
l1= new JPanel();
l2= new JPanel();
l3= new JPanel();
l4= new JPanel();
contain= new JPanel();
side1= new JPanel();
up1= new JPanel();
title = new JLabel("E-ROBOT");
title.setFont(new Font("Ravie", Font.PLAIN, 40));
title.setForeground(Color.WHITE);
title.setBounds(520, 100, 300, 50);
//custom colors
Color b1= new Color(99,230,199);
Color h= new Color(132,234,23);
Color h1= new Color(45,99,120);
Color h2= new Color(0,0,101);
Color h4= new Color(154,0,0);
l1.setBounds(480,200,10,525);
l1.setBackground(h4);
l2.setBounds(465,210,565,10);
l2.setBackground(h4);
l3.setBounds(1000,200,10,525);
l3.setBackground(h4);
l4.setBounds(465,690,565,10);
l4.setBackground(h4);
// settings style amd font of buttons
newg = new JButton("New Game");
newg.setFont(new Font("Ravie", Font.PLAIN, 25));
newg.setBackground(Color.YELLOW);
newg.setOpaque(false);
newg.setBorder(null);
newg.setForeground(h2);
high = new JButton("High Scores");
robo= new JButton("Select your Robot");
inst = new JButton("How to Play");
high.setFont(new Font("Ravie", Font.PLAIN, 25));
high.setBackground(Color.YELLOW);
high.setOpaque(false);
high.setBorder(null);
high.setForeground(h1);
robo.setFont(new Font("Ravie", Font.PLAIN, 25));
robo.setBackground(Color.YELLOW);
robo.setOpaque(false);
robo.setBorder(null);
robo.setForeground(h);
inst.setFont(new Font("Ravie", Font.PLAIN, 25));
inst.setBackground(Color.YELLOW);
inst.setOpaque(false);
inst.setBorder(null);
inst.setForeground(Color.MAGENTA);
contain.setBounds(490,220,490,460);
contain.setLayout(new GridLayout(4,1));
side1.setBounds(0,40,mm.width,60);
up1.setBounds(40,0,40,mm.height);
side1.setBackground(h4);
up1.setBackground(h4);
//adding all the JComponents to the screen
side1.add(title);
contain.add(newg);
contain.add(high);
contain.add(robo);
contain.add(inst);
add(l1);
add(l2);
add(l3);
add(l4);
add(side1);
add(up1);
add(contain);
}
}
class Robot extends JPanel{
ImageIcon a;
ImageIcon b;
ImageIcon c;
JPanel side2;
JPanel up2;
static JButton r1;
static JButton r2;
static JButton r3;
static JButton back1;
static JButton go;
JLabel title1;
Robot(){
Color h= new Color(132,234,23);
MainMenu mm= new MainMenu();
Color h3= new Color(255,229,204);
Color h4= new Color(154,0,0);
side2= new JPanel();
up2= new JPanel();
r1= new JButton();
r2= new JButton();
r3= new JButton();
back1= new JButton("Back");
go= new JButton("LEt's go");
a = new ImageIcon(getClass().getResource("a.gif"));
b = new ImageIcon(getClass().getResource("b.gif"));
c = new ImageIcon(getClass().getResource("c.gif"));
//adding the ImageIcons to the JButtons
r1 = new JButton(a);
r1.setBounds(120,120,300,300);
r1.setBackground(Color.YELLOW);
r1.setOpaque(false);
r1.setBorder(null);
r2 = new JButton(b);
r2.setBounds(460,120,300,300);
r2.setBackground(Color.YELLOW);
r2.setOpaque(false);
r2.setBorder(null);
r3 = new JButton(c);
r3.setBounds(890,120,300,300);
r3.setBackground(Color.YELLOW);
r3.setOpaque(false);
r3.setBorder(null);
back1 = new JButton("Let's Go!");
back1.setBounds(520, 500, 170, 60);
back1.setFont(new Font("Ravie", Font.PLAIN, 25));
back1.setBackground(Color.YELLOW);
back1.setOpaque(false);
back1.setBorder(null);
setLayout(null);
title1 = new JLabel("E-ROBOT");
title1.setFont(new Font("Ravie", Font.PLAIN, 40)); //setting the style and the font of JLabel
// title1.setBounds(520, 100, 300, 50);
side2.setBounds(0,40,mm.width,60);
up2.setBounds(40,0,40,mm.height);
side2.setBackground(h);
up2.setBackground(h);
side2.add(title1);
add(side2);
add(up2);
add(r1);
add(r2);
add(r3);
add(back1);
add(go);
}
}
class High extends JPanel{
JLabel title3;
static JButton back2;
JPanel side4;
JPanel up4;
High()
{
Color h= new Color(132,234,23);
MainMenu mm= new MainMenu();
Color h3= new Color(255,229,204);
side4 = new JPanel();
up4= new JPanel();
Color h1= new Color(45,99,120);
setLayout(null);
title3 = new JLabel("E-ROBOT");
title3.setFont(new Font("Ravie", Font.PLAIN, 40)); //setting the style and the font of JLabel
title3.setBounds(520, 100, 300, 50);
back2= new JButton("Back");
back2.setBounds(500,500,120,30);
back2.setFont(new Font("Ravie", Font.PLAIN, 25));
back2.setBackground(Color.YELLOW);
back2.setOpaque(false);
back2.setBorder(null);
side4.setBounds(0,40,mm.width,60);
up4.setBounds(40,0,40,mm.height);
side4.setBackground(h1);
up4.setBackground(h1);
side4.add(title3);
add(side4);
add(up4);
add(back2);
}
}
class Inst extends JPanel{
JLabel jl1;
JLabel jl2;
JLabel jl3;
JLabel jl4;
JLabel jl5;
JLabel title2;
JPanel side3;
JPanel up3;
static JButton back;
JPanel contain2;
Inst(){
MainMenu mm= new MainMenu();
contain2= new JPanel();
side3= new JPanel();
up3= new JPanel();
Color h= new Color(132,234,23);
Color h3= new Color(255,229,204);
jl1= new JLabel("Welcome aboard\n !");
jl2 = new JLabel("So the game is simple.\n");
jl3 = new JLabel("You have to catch even number only\n.");
jl4 = new JLabel("A life ends if you catch an odd number.\n");
jl5 = new JLabel("Oh and also the game gets more difficult when your lives end!\n");
jl1.setFont(new Font("Ravie", Font.PLAIN, 20));
jl2.setFont(new Font("Ravie", Font.PLAIN, 20));
jl3.setFont(new Font("Ravie", Font.PLAIN, 20));
jl4.setFont(new Font("Ravie", Font.PLAIN, 20));
jl5.setFont(new Font("Ravie", Font.PLAIN, 20));
jl1.setForeground(Color.magenta);
jl2.setForeground(Color.magenta);
jl3.setForeground(Color.magenta);
jl4.setForeground(Color.magenta);
jl5.setForeground(Color.magenta);
title2 = new JLabel("E-ROBOT");
title2.setFont(new Font("Ravie", Font.PLAIN, 40)); //setting the style and the font of JLabel
title2.setBounds(520, 100, 300, 50);
back = new JButton("Back");
back.setFont(new Font("Ravie", Font.PLAIN, 15));
back.setBackground(Color.YELLOW);
back.setOpaque(false);
back.setBorder(null);
setLayout(null);
contain2.setBounds(80,200,800,400);
contain2.setBackground(h3);
side3.setBounds(0,40,mm.width,60);
up3.setBounds(40,0,40,mm.height);
side3.setBackground(Color.MAGENTA);
up3.setBackground(Color.MAGENTA);
side3.add(title2);
contain2.add(jl1);
contain2.add(jl2);
contain2.add(jl3);
contain2.add(jl4);
contain2.add(jl5);
contain2.add(back);
add(contain2);
add(side3);
add(up3);
}
}
答案 0 :(得分：0)
我不确定它是否有帮助（抱歉，但您的代码太大且格式错误，所以我无法理解），但您可以尝试每次重新验证并重新绘制JFrame的根窗格或内容窗格当您更新GUI时。
像这样的东西
public static void updateRootPane(JComponent aComponent) {
Window w = SwingUtilities.windowForComponent(aComponent);
if (w instanceof JFrame) {
((JFrame) w).getRootPane().revalidate();
((JFrame) w).getRootPane().repaint();
} else if (w instanceof JDialog) {
((JDialog) w).getRootPane().revalidate();
((JDialog) w).getRootPane().repaint();
}
}