JSplitPanel--- divider locates at the left(upper) component

Question

I want the divider is located at the right(under) component.
run this program you will see my effect, and fix this problem. thanks for reading
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
public class ChatFrame extends JFrame{
     private JTree tree = null;
     private ClientNode[] clientArray= new ClientNode[9999];
     private JTextArea textChat=null;
     private JTextField [] textBox = new JTextField[9999];
     private Socket connection=null;
     private BufferedReader in = null;
     private PrintWriter out = null;
     private int port;
     private JTabbedPane communicationTab;
     private JButton sendButton;
     public ChatFrame(int port){
          setSize(300,300);
          this.port = port;
          DefaultMutableTreeNode user = new DefaultMutableTreeNode("Another users");
          DefaultMutableTreeNode Client1 = new DefaultMutableTreeNode("Client 1");
          user.add(Client1);
          tree = new JTree(user);
          JScrollPane treeScrollPane = new JScrollPane(tree);
          JPanel p = new JPanel();
          p.add(treeScrollPane);
          communicationTab = new JTabbedPane();
          JSplitPane upperSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,communicationTab,p);
          upperSplitPane.setContinuousLayout(true);
          upperSplitPane.setOneTouchExpandable(true);
          upperSplitPane.setLastDividerLocation(1);
          textChat = new JTextArea();
          textChat.setLineWrap(true);
          textChat.setWrapStyleWord(true);
          JScrollPane scroll = new JScrollPane(textChat);
          JPanel q = new JPanel();
          sendButton = new  JButton("Send");
          sendButton.setSize(2,2);
          q.setLayout(new FlowLayout());          
          q.add(sendButton);
          JPanel tc = new JPanel();
          tc.setLayout(new BorderLayout());
          tc.add(scroll, BorderLayout.CENTER);
          tc.add(q,BorderLayout.EAST);
          JSplitPane underSplitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,upperSplitPane,tc);
          underSplitPane.setLastDividerLocation(1);
          getContentPane().add(underSplitPane,"Center");
     public void connectToServer(){
          try{
               connection = new Socket("serverName",getPort());
               while(true){
                    in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                    out = new PrintWriter(connection.getOutputStream());
                    String s = in.readLine();
                    if(s!=null){
                         textChat.append(s);
          }catch(Exception e){
     public int getPort(){
          return port;
     public static void main(String[] args){
          ChatFrame c = new ChatFrame(903);
          c.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          c.show();
}

Answer 1

thanks smith...
I have resolved my problem at this evening...
I have just used setResizeWeight(double C);
C value of 0, the default, indicates the right/bottom component gets all the extra space (the left/top component acts fixed), where as a value of 1 specifies the left/top component gets all the extra space (the right/bottom component acts fixed). Specifically, the left/top component gets (weight * diff) extra space and the right/bottom component gets (1 - weight) * diff extra space.
thanks so much.. You make try to fight this project all I have...