Swing问题！（Swing 高手请进）

[pipen]

请问在JInternalFrame窗口中可以添加JSplitPane面板吗？
最好给出简单示例！
我试了，总是出错，出错信息如下：（一定给分拉）

C:\JBuilder6\jdk1.3.1\bin\javaw -classpath "D:\jbproject\jbform\classes;C:\JBuilder6\jdk1.3.1\demo\jfc\Java2D\Java2Demo.jar;C:\JBuilder6\jdk1.3.1\jre\lib\i18n.jar;C:\JBuilder6\jdk1.3.1\jre\lib\jaws.jar;C:\JBuilder6\jdk1.3.1\jre\lib\rt.jar;C:\JBuilder6\jdk1.3.1\jre\lib\sunrsasign.jar;C:\JBuilder6\jdk1.3.1\lib\dt.jar;C:\JBuilder6\jdk1.3.1\lib\htmlconverter.jar;C:\JBuilder6\jdk1.3.1\lib\tools.jar" jbform.FormDesigner
java.lang.NullPointerException: peer

at sun.awt.windows.WCanvasPeer.create(Native Method)

at sun.awt.windows.WComponentPeer.<init>(WComponentPeer.java:375)

at sun.awt.windows.WCanvasPeer.<init>(WCanvasPeer.java:26)

at sun.awt.windows.WToolkit.createCanvas(WToolkit.java:285)

at java.awt.Canvas.addNotify(Canvas.java:76)

at java.awt.Container.addNotify(Container.java:1579)

at javax.swing.JComponent.addNotify(JComponent.java:3500)

at java.awt.Container.addNotify(Container.java:1579)

at javax.swing.JComponent.addNotify(JComponent.java:3500)

at java.awt.Container.addNotify(Container.java:1579)

at javax.swing.JComponent.addNotify(JComponent.java:3500)

at java.awt.Container.addNotify(Container.java:1579)

at javax.swing.JComponent.addNotify(JComponent.java:3500)

at javax.swing.JRootPane.addNotify(JRootPane.java:483)

at java.awt.Container.addNotify(Container.java:1579)

at javax.swing.JComponent.addNotify(JComponent.java:3500)

at java.awt.Container.addNotify(Container.java:1579)

at javax.swing.JComponent.addNotify(JComponent.java:3500)

at javax.swing.JInternalFrame.show(JInternalFrame.java:1459)

at java.awt.Component.show(Component.java:946)

at java.awt.Component.setVisible(Component.java:903)

at javax.swing.JComponent.setVisible(JComponent.java:1833)

at jbform.FrameDesigner.jbInit(FrameDesigner.java:184)

at jbform.FrameDesigner.<init>(FrameDesigner.java:94)

at jbform.FormDesigner.<init>(FormDesigner.java:20)

at jbform.FormDesigner.main(FormDesigner.java:52)

[qxjavajava]

import javax.swing.*;import java.awt.*;import java.awt.event.*;
class Mywindow extends JFrame
{ JButton button1,button2,button;JTextArea text;JSplitPane split_one,split_two;
Mywindow()
{setSize(200,400);setVisible(true); Container con=getContentPane();
JPanel pp = new JPanel();
TextField tt = new TextField("Hello");
TextArea ta = new TextArea(4,10);
pp.setLayout(new FlowLayout());
pp.add(tt);
pp.add(ta);
JInternalFrame interframe_1,interframe_2;
button=new JButton("Boy");
interframe_1=new JInternalFrame("内窗体1",true,true,true,true);
interframe_1.setSize(100,100);
interframe_1.getContentPane().add(pp);
JDesktopPane desk1=new JDesktopPane();
desk1.add(interframe_1);
button1=new JButton("ok"); button2=new JButton("No");
text=new JTextArea("I love you,java",10,20);
split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,desk1,button2);
split_two=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,split_one,text);
con.add(split_two,BorderLayout.CENTER);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
public class Example25_8
{ public static void main(String args[])
{ Mywindow win=new Mywindow();win.pack();
}
}
稍作改动，没细考虑

[bigbearcn]

/*
* test.java
*
* Created on 2002年9月16日, 下午12:56
*/

/**
*
* @author Administrator
*/
public class test extends javax.swing.JInternalFrame {

/** Creates new form test */
public test() {
initComponents();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
private void initComponents() {
jSplitPane1 = new javax.swing.JSplitPane();
jTree1 = new javax.swing.JTree();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();

jSplitPane1.setLeftComponent(jTree1);

jTextArea1.setPreferredSize(new java.awt.Dimension(280, 50));
jScrollPane1.setViewportView(jTextArea1);

jSplitPane1.setRightComponent(jScrollPane1);

getContentPane().add(jSplitPane1, java.awt.BorderLayout.WEST);

pack();
}


// Variables declaration - do not modify
private javax.swing.JTree jTree1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JSplitPane jSplitPane1;
// End of variables declaration

}

[qxjavajava]

内部窗体的一个常用的构造方法：
JInternalFrame(String title,boolean resizable,boolean closable,boolean max ,boolean min)，
第一个参数是窗体的名字，接下来的参数分别决定窗体能否调整大小，能否关闭，能否最大化，能否最小化。对于内部窗体需注意下列两点：
1. 内部窗体和前面讲的中间容器有所不同，我们不能直接把组件加到内部窗体中，而只能加到它的内容面板中。内部窗体和JFrame窗体一样，可以通过getContentPane()得到它的内容窗体。
2. 为了能显示内部窗体，必须把内部窗体先添加到一个容器中，这个容器是JdesktopPane，该容器是专门为内部窗体服务的。
3. 不必再调用setVisible为内部窗体设置可见性，它和所在的容器一起显示。但是内部窗体仍然需要调用　setSize()或setBounds设置大小。内部窗体的默认布局也是BorderLayout布局。

[pipen]

to bigbearcn(bigbearcn) :你可能没有理解我要的是什么？我自己也写了，但是把我写的JInternalFrame加到Desktop的时候出错！仍然要对你说谢谢了！
to qxjavajava(射手座) :你仍然是直接把JSplitPane加到contentPane中了，你的代码中生成了desktopPane，但是没有使用！

[bigbearcn]

可能我没理解你的意思,贴出你的代码,我们看看到底途径原因

[qxjavajava]

JDesktopPane desk1=new JDesktopPane();
desk1.add(interframe_1);
.....
split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,desk1,button2);
谁说我没用JDesktopPane

[pipen]

我的代码如下，烦劳高手看看！谢谢！Tree.java
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class Test extends JFrame{

public Test(){
Container contentPane = getContentPane();
JInternalFrame iframe = new NewFrame();
JDesktopPane desktop = new JDesktopPane();
desktop.add(iframe,new Integer(1));
contentPane.add(desktop);
try{
iframe.setVisible(true);
iframe.setSelected(true);
}catch(java.beans.PropertyVetoException ee){
System.out.println("sdjfl");
ee.printStackTrace();
}

}

public static JFrame createFrame() {
JFrame frame = new Test();
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
frame.addWindowListener(l);
return frame;
}
public JSplitPane initSplitPane(){
JTextArea text1 = new JTextArea();
JTextArea text2 = new JTextArea();
JSplitPane split = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,text1,text2);
split.setDividerLocation(20);
return split;
}
public static void main(String[] args) {
JFrame fframe = createFrame();
fframe.setSize(200,200);
fframe.show();
}
class NewFrame extends JInternalFrame{
public NewFrame(){
super("",true,true,true,true);
setTitle("sd");
JPanel top = new JPanel();
top.setLayout(new BorderLayout());
JSplitPane split = initSplitPane();
top.add(split,BorderLayout.CENTER);
setContentPane(top);
pack();
setSize(100,100);
setLocation(10,10);
}
}

}

[pipen]

上面的文件名应该是：Test.java!
我要做的就是在一个MDI的窗口中打开一个内部窗口（JInternalFrame）,在打开的JInternalFrame中使用JSplitPane!
to qxjavajava(射手座) ：刚才是我没有看清楚，不好意思！但是你是把desktop(包含JInternalFrame）添加到了JSplitPane中，我要问的是怎么能把JSplitPane添加到JInternalFrame中

[pipen]

往前推一下！
有人知道的话麻烦看一下！

[pipen]

如果不能这样做，请说明一下理由，一样给分了

[qxjavajava]

import javax.swing.*;import java.awt.*;import java.awt.event.*;
class Mywindow extends JFrame
{ JButton button1,button2,button;JTextArea text;JSplitPane split_one,split_two;
Mywindow()
{setSize(200,400);setVisible(true); Container con=getContentPane();
JInternalFrame interframe_1,interframe_2;
button=new JButton("Boy");
interframe_1=new JInternalFrame("内窗体1",true,true,true,true);
interframe_1.setSize(100,100);
interframe_1.getContentPane().add(button);
JDesktopPane desk1=new JDesktopPane();
desk1.add(interframe_1);
button1=new JButton("ok"); button2=new JButton("No");
text=new JTextArea("I love you,java",10,20);
split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,desk1,button2);
split_two=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,split_one,text);
con.add(split_two,BorderLayout.CENTER);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
public class Example25_8
{ public static void main(String args[])
{ Mywindow win=new Mywindow();win.pack();
}
}
试一试

[pipen]

谢谢！
不过，你的SplitPane还是加到了contentPane中，
我的应用是这样的，我要做一个MDI的应用，在桌面desktop上打开一个InternalFrame,然后我的应用的UI存放在Internalframe的SplitPane中，
我认为你的这句：con.add(split_two,BorderLayout.CENTER);是加在con中的了！
可以再帮我看看吗？

[qxjavajava]

其实也可以加，但是我发现效果很难看，所以就用了这种方法。