Java:JPanel在CardLayout中未正确显示
我的Java:JPanel在CardLayout中未正确显示,java,swing,applet,layout-manager,cardlayout,Java,Swing,Applet,Layout Manager,Cardlayout,我的JPanelstartPan应该在小程序启动时显示,但是现在,只有JButtonsetupGameBut显示。但如果我单击setupGameBut,然后单击cancelBut返回startPan,它会显示规则,但仍然不会显示JLabelheadingLab(它会显示在setupPan上) 除此之外,它还会在当前显示的面板后面显示来自其他面板的组件,但这些组件无法与之交互 单击按钮时,如果在加载下一张卡之前将光标移离该按钮,则在再次鼠标悬停之前,该按钮不会更新为应该显示在那里的按钮。我有一种感
JPanel
startPan应该在小程序启动时显示,但是现在,只有JButton
setupGameBut显示。但如果我单击setupGameBut,然后单击cancelBut返回startPan,它会显示规则,但仍然不会显示JLabel
headingLab(它会显示在setupPan上)
除此之外,它还会在当前显示的面板后面显示来自其他面板的组件,但这些组件无法与之交互
单击按钮时,如果在加载下一张卡之前将光标移离该按钮,则在再次鼠标悬停之前,该按钮不会更新为应该显示在那里的按钮。我有一种感觉,我的代码有一些根本性的错误,我有这些问题,但我不确定
/*
*Java Version: 1.8.0_25
*Author: Peadar Ó Duinnín
*Student Number: R00095488
*/
package As1;
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Choice;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class AUIApplet extends JApplet {
private final int APPLET_WIDTH;
private final int APPLET_HEIGHT;
private final int[] highScores = new int[3];
private int currentScore;
final Font normalFont = new Font("Cambria", Font.PLAIN, 18);
final Font headingFont = new Font("Cambria", Font.BOLD, 24);
JPanel contPan, startPan, setupPan, gamePan, scorePan, startInfoPan, gameInfoPan, rulePan, setupInfoPan, gameOptPan;
JButton setupGameBut, cancelBut, endGameBut, startGameBut;
JLabel highScoreLab, currentScoreLab, headingLab, rulesLab, difficultyScoreLab;
Choice difficulty;
CardLayout cl = new CardLayout();
public AUIApplet() {
this.APPLET_HEIGHT = 400;
this.APPLET_WIDTH = 600;
for (int i : highScores) {
i = 0;
}
}
@Override
public void init() {
//set applet size
setSize(APPLET_WIDTH, APPLET_HEIGHT);
//start screen
startPan = new JPanel();
startPan.setLayout(new BorderLayout());
//setup screen
setupPan = new JPanel();
setupPan.setLayout(new BorderLayout());
setupGameBut = new JButton("New Game");
cancelBut = new JButton("Cancel");
//game screen
gamePan = new JPanel();
gamePan.setLayout(new BorderLayout());
endGameBut = new JButton("Quit Game");
//heading label
headingLab = new JLabel("Number Memory");
headingLab.setFont(headingFont);
//rule panel
rulePan = new JPanel();
rulePan.setLayout(new GridLayout(8,1));
rulePan.add(new JLabel("Rules:"));
rulePan.add(new JLabel("1. You will be shown a series of numbers, one at a time."));
rulePan.add(new JLabel("2. You must recite the series of numbers after the last number has been displayed."));
rulePan.add(new JLabel("3. After each correct recitation of the sequence, another sequence will play with one extra number."));
rulePan.add(new JLabel("Note: You can decrease/increase the time each number displays for by changing the difficulty."));
//difficulty selection
difficulty = new Choice();
difficulty.add("Easy");
difficulty.add("Normal");
difficulty.add("Hard");
difficulty.add("Extra Hard");
difficulty.select(1);
difficultyScoreLab = new JLabel("" + highScores[1] + "");
switch(difficulty.getSelectedIndex()) {
case 0: difficultyScoreLab.setText("" + highScores[0] + "");
break;
case 1: difficultyScoreLab.setText("" + highScores[1] + "");
break;
case 2: difficultyScoreLab.setText("" + highScores[2] + "");
break;
case 3: difficultyScoreLab.setText("" + highScores[3] + "");
break;
}
//game option panel
gameOptPan = new JPanel();
gameOptPan.setLayout(new GridLayout(1,2));
startGameBut = new JButton("Start Game");
gameOptPan.add(startGameBut);
gameOptPan.add(difficulty);
//start info panel
startInfoPan = new JPanel();
startInfoPan.setLayout(new BorderLayout());
startInfoPan.add(rulePan, BorderLayout.CENTER);
//setup info panel
setupInfoPan = new JPanel();
setupInfoPan.setLayout(new BorderLayout());
setupInfoPan.add(gameOptPan, BorderLayout.SOUTH);
setupInfoPan.add(new JLabel("High Score:"), BorderLayout.NORTH);
setupInfoPan.add(difficultyScoreLab, BorderLayout.CENTER);
//game info panel
gameInfoPan = new JPanel();
gameInfoPan.setLayout(new BorderLayout());
//score panel
scorePan = new JPanel();
scorePan.setLayout(new GridLayout(10,1));
highScoreLab = new JLabel("High Score: " + highScores[difficulty.getSelectedIndex()] + " ");
currentScoreLab = new JLabel("Current Score: " + currentScore + " ");
scorePan.add(highScoreLab);
scorePan.add(currentScoreLab);
//adding to start panel
startPan.add(setupGameBut, BorderLayout.SOUTH);
startPan.add(headingLab, BorderLayout.NORTH);
startPan.add(startInfoPan, BorderLayout.CENTER);
//adding to setup panel
setupPan.add(cancelBut, BorderLayout.SOUTH);
setupPan.add(headingLab, BorderLayout.NORTH);
setupPan.add(setupInfoPan, BorderLayout.CENTER);
//adding to game panel
gamePan.add(endGameBut, BorderLayout.SOUTH);
gamePan.add(headingLab, BorderLayout.NORTH);
gamePan.add(gameInfoPan, BorderLayout.CENTER);
gamePan.add(scorePan, BorderLayout.EAST);
//setting up container panel and adding each screen to it
contPan = new JPanel();
contPan.setLayout(cl);
contPan.add(startPan, "Start Applet Screen");
contPan.add(setupPan, "Setup Game Screen");
contPan.add(gamePan, "New Game Screen");
//action listeners
setupGameBut.addActionListener((ActionEvent e) -> {
newGame();
});
startGameBut.addActionListener((ActionEvent e) -> {
startGame();
});
cancelBut.addActionListener((ActionEvent e) -> {
quitGame();
});
endGameBut.addActionListener((ActionEvent e) -> {
quitGame();
});
//add container panel
this.add(contPan);
}
@Override
public void paint(Graphics g) {
}
public void newGame() {
cl.show(contPan, "Setup Game Screen");
}
public void startGame() {
cl.show(contPan, "New Game Screen");
}
public void quitGame() {
cl.show(contPan, "Start Applet Screen");
if (currentScore > highScores[difficulty.getSelectedIndex()]) {
highScores[difficulty.getSelectedIndex()] = currentScore;
}
currentScore = 0;
}
@Override
public Insets getInsets() {
return new Insets(10, 10, 10, 10);
}
}
不要覆盖paint()
很少有理由这样做,我想不出有什么理由使用空方法。空方法必然会导致问题
我稍后会在我的绘画程序中使用它
仍然不覆盖paint()。自定义绘制通过重写JPanel(或JComponent)的paintComponent(…)
方法完成,然后将面板添加到小程序中
有关更多信息和示例,请阅读上Swing教程的部分。不要覆盖
paint()
。很少有理由这样做,我想不出有什么理由使用空方法。空方法肯定会引起问题。@camickr我稍后将在我的绘画材料程序(大学的应用程序用户界面模块)中使用它,因此我们必须展示我们知道如何使用图形类绘制材料。但这解决了一切。谢谢我必须找到一种方法,当我实现它时,它不会破坏一切…@camickr我不知道在这种情况下该怎么办。我是否要删除该问题?还是要添加答案?添加了包含更多信息的答案。