how to show all TextArea in JLabel?

Dera frinds:

Good weekends.

I met a simple problem when I run my code below, TextArea did not show up, what is wrong here?

package com.aaa;

import java.awt.Container;

import java.awt.GridLayout;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JLabel;

import javax.swing.*;

import java.awt.*;

publicclass TextAreaSample{

publicstaticvoid main(String args[]){

String title = (args.length == 0 ?"TextArea Example" : args[0]);

JFrame frame =new JFrame(title);

Container content = frame.getContentPane();

content.setLayout(new GridLayout(0, 2));

JTextArea leftTextArea =new JTextArea("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");

leftTextArea.append("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");

leftTextArea.setLineWrap(true);

leftTextArea.setEditable(true);

leftTextArea.setPreferredSize(new Dimension(100, 300));

JLabel jl =new JLabel("OK");

jl.setPreferredSize(new Dimension(200, 300));

jl.setVisible(true);

jl.add(leftTextArea);

content.add(jl);

//leftTextArea.paste();

JTextArea rightTextArea =new JTextArea(){

publicboolean isManagingFocus(){

returnfalse;

}

};

rightTextArea.append("BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB");

rightTextArea.setLineWrap(true);

rightTextArea.setEditable(true);

rightTextArea.setPreferredSize(new Dimension(100, 300));

// rightTextArea.paste();

jl.add(rightTextArea);

JScrollPane rightPane =new JScrollPane(jl);