JTextArea设置不可编辑，并显示I型光标

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;

public class Test extends JFrame {
JTextArea text;

public Test() {
super( "JTextArea ");
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent) {
System.exit(0);
}
});
text = new JTextArea();
text.setText( "我们都有一个家，名字叫中国，兄弟姐妹都很多...... ");
text.setEditable(false);
text.addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent mouseEvent) {
text.setCursor(new Cursor(Cursor.TEXT_CURSOR)); //鼠标进入Text区后变为文本输入指针
}
public void mouseExited(MouseEvent mouseEvent) {
text.setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); //鼠标离开Text区后恢复默认形态
}
});
text.getCaret().addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
text.getCaret().setVisible(true); //使Text区的文本光标显示
}
});
this.getContentPane().add(text);
this.setSize(300, 200);
this.setVisible(true);
}
public static void main(String[] args) {
new Test();
}
}