About ToolBar

I added two ToolBars in my program see below. It works fine until i move the toolbar. An exception was thrown:

Exception in thread"AWT-EventQueue-0" java.lang.IllegalArgumentException: cannot add to layout: constraints must be a GridBagConstraint

at java.awt.GridBagLayout.addLayoutComponent(Unknown Source)

at java.awt.Container.addImpl(Unknown Source)

at java.awt.Container.add(Unknown Source)

at javax.swing.plaf.basic.BasicToolBarUI.setFloating(Unknown Source)

at javax.swing.plaf.basic.BasicToolBarUI.floatAt(Unknown Source)

at javax.swing.plaf.basic.BasicToolBarUI$Handler.mouseReleased(Unknown Source)

at javax.swing.plaf.basic.BasicToolBarUI$DockingListener.mouseReleased(Unknown Source)

at java.awt.Component.processMouseEvent(Unknown Source)

at javax.swing.JComponent.processMouseEvent(Unknown Source)

at java.awt.Component.processEvent(Unknown Source)

at java.awt.Container.processEvent(Unknown Source)

at java.awt.Component.dispatchEventImpl(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Window.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

import java.awt.BorderLayout;

import java.awt.GridBagLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JToolBar;

publicclass Testextends JFrame{

public Test(){

JToolBar toolBar1=new JToolBar();

toolBar1.add(new JButton("button1"));

JToolBar toolBar2 =new JToolBar();

toolBar2.add(new JButton("button2"));

JPanel panel =new JPanel();

panel.setLayout(new GridBagLayout());

panel.add(toolBar1);

panel.add(toolBar2);

this.setLayout(new BorderLayout());

this.add(panel,BorderLayout.NORTH);

}

/**

* @param args

*/

publicstaticvoid main(String[] args){

// TODO Auto-generated method stub

Test test =new Test();

test.setSize(200,200);

test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

test.setVisible(true);

}

}

[4024 byte] By [youhaodiyia] at [2007-11-27 10:34:35]