Question

为什么我用JAVA编程会出现这样的错误提示

java.lang.Error: Do not use ChatJFrame.add() use ChatJFrame.getContentPane().add() instead
at javax.swing.JFrame.createRootPaneException(JFrame.java:465)
at javax.swing.JFrame.addImpl(JFrame.java:491)
at java.awt.Container.add(Container.java:307)
at ChatJFrame.<init>(ChatJFrame.java:19)
at ChatServerSocket.<init>(ChatServerSocket.java:27)
at ChatServerSocket.main(ChatServerSocket.java:45)
Exception in thread "main"
我用的工具是netbeans 编写一个聊天室程序 程序没有问题 可是一测试结果就出现上面的提示 正常的话会谈出聊天窗口的 这是为什么？？？
请高手帮忙 急急急！！！！！！！！！！！！！！谢谢了！！！

Answer 1

看看 java API 文档
The JFrame class is slightly incompatible with Frame. Like all other JFC/Swing top-level containers, a JFrame contains a JRootPane as its only child. The content pane provided by the root pane should, as a rule, contain all the non-menu components displayed by the JFrame. This is different from the AWT Frame case. As a conveniance add and its variants, remove and setLayout have been overridden to forward to the contentPane as necessary. This means you can write:

frame.add(child);

And the child will be added to the contentPane. The content pane will always be non-null. Attempting to set it to null will cause the JFrame to throw an exception. The default content pane will have a BorderLayout manager set on it. Refer to RootPaneContainer for details on adding, removing and setting the LayoutManager of a JFrame

估计是你没有Layout的缘故 要用个布局器吧

Answer 2

Do not use ChatJFrame.add() use ChatJFrame.getContentPane().add() instead