textarea 如何控制自动换行

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseListener;
import java.awt.Event.*;
/**
*
* @author zy
*/
public class Main extends JFrame //implements MouseListener
{
static JTextField txt1 = new JTextField();
static JTextField txt2 = new JTextField();
static JButton but1 = new JButton("开始执行");
static JButton but2 = new JButton("开始执行");
static JLabel la1 = new JLabel("输入回收的块号");
static JLabel la2 = new JLabel("盘块分配演示");
static JLabel la3 = new JLabel("输入分配所需的块数");
static JLabel la4 = new JLabel("盘块回收演示");
static JLabel la5 = new JLabel("盘块未进行分配，回收前的使用情况");
static JLabel la6 = new JLabel("盘块执行操作后的情况");
static JTable ta1 = new JTable (8, 6);
static JTable ta2 = new JTable (16, 16);
static JLabel la8 = new JLabel("盘块执行操作后的情况");
static TextAre