Question

我进行了搜索，但所有答案都是关于cardlayout的，并且我经历过cardlayout需要一个始终可见的面板来执行操作。我有这个游戏..

我想让它显示一个新面板，其中包含消息游戏结束和选项

再次播放

退出
当序列出现时在同一窗口中我创建了一个名为 GameOver 的新类，并在其构造函数中创建了一个面板，并在其中添加了上述选项。并尝试使用构造函数或新方法等。但是当我在主游戏类中调用它时它会给出空指针异常错误
更新：这是整个Stack Trace。

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.awt.Container.addImpl(Container.java:1091)
at java.awt.Container.add(Container.java:1003)
at javax.swing.JFrame.addImpl(JFrame.java:564)
at java.awt.Container.add(Container.java:415)
at Tic_Tac_new.mouseClicked(Tic_Tac_new.java:132)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:270)
at java.awt.Component.processMouseEvent(Component.java:6528)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6290)
at java.awt.Container.processEvent(Container.java:2234)
at java.awt.Component.dispatchEventImpl(Component.java:4881)
at java.awt.Container.dispatchEventImpl(Container.java:2292)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4542)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
at java.awt.Container.dispatchEventImpl(Container.java:2278)
at java.awt.Window.dispatchEventImpl(Window.java:2739)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:719)
at java.awt.EventQueue$4.run(EventQueue.java:717)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

建立成功（总时间：11秒）

pGOver

@Override
    public void mouseClicked(MouseEvent e) {

               if (e.getSource()== buttonsArray[0] && turn == true){
                        buttonsArray[0].setText("X");
                        turn = false;
                        checkXb1();
                        buttonsArray[0].setForeground(Color.red);
                        turntxt.setText(turnA);

//                        newGame.remove(mainGamePanel);
                        this.add(GameOver.pGOver);
                    }

在java游戏结束时切换面板

0 个答案: