[java]代码库package three;

//这段程序主要是创建一个JTabbedPane面板，为每一个标签设置一个名称

import javax.swing.*;

import java.awt.*;

public class test7

{

public static void main(String[] args)

{

try

{//显示外观风格

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

}

catch(Exception e){

e.printStackTrace();

}

JFrame frame = new JFrame ("资金状况");

frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

frame.setVisible (true);//默认为false

JTabbedPane tp=new JTabbedPane();//创建一个选项卡容器，将之添加到顶层容器内

frame.setContentPane(tp);

JPanel panel1 = new JPanel ();

JPanel panel2 = new JPanel ();

JPanel panel3 = new JPanel ();

JPanel panel4 = new JPanel ();

JPanel panel5 = new JPanel ();

tp.addTab("panel1", panel1); //添加选项卡容器，并且设置其中每个选项卡的标签以及其是否可启用

tp.setEnabledAt(0,true);

tp.setTitleAt(0,"个人收入状况");

tp.addTab ("panel2", panel2);

tp.setEnabledAt (1, true);

tp.setTitleAt (1,"工资");

tp.addTab ("panel3", panel3);

tp.setEnabledAt (2, true);

tp.setTitleAt (2,"奖金");

tp.addTab ("panel4", panel4);

tp.setEnabledAt(3,true);

tp.setTitleAt(3,"津贴");

tp.addTab ("panel5", panel5);

tp.setEnabledAt(4,true);

tp.setTitleAt(4,"社保");

///设置其大小以及其选项卡的位置方向

tp.setPreferredSize (new Dimension (500,200));

tp.setTabPlacement (JTabbedPane.TOP);

///设置选项卡在容器内的显示形式

tp.setTabLayoutPolicy (JTabbedPane.SCROLL_TAB_LAYOUT);

frame.pack();

}

}

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

at javax.swing.plaf.basic.BasicTabbedPaneUI.rotateInsets(BasicTabbedPaneUI.java:1920)

at javax.swing.plaf.basic.BasicTabbedPaneUI.getTabAreaInsets(BasicTabbedPaneUI.java:1579)

at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneScrollLayout.calculateTabRects(BasicTabbedPaneUI.java:2792)

at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.calculateLayoutInfo(BasicTabbedPaneUI.java:2263)

at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneScrollLayout.layoutContainer(BasicTabbedPaneUI.java:2596)

at java.awt.Container.layout(Container.java:1401)

at java.awt.Container.doLayout(Container.java:1390)

at java.awt.Container.validateTree(Container.java:1473)

at java.awt.Container.validateTree(Container.java:1480)

at java.awt.Container.validateTree(Container.java:1480)

at java.awt.Container.validate(Container.java:1448)

at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)

at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:109)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

初次接触swing 。。完全看不懂这个异常从哪里出来的。。

求讲解。~//源代码片段来自云代码http://yuncode.net