有那位大哥可以帮忙一下~~

Question

我想问为什么下面那程序的text没有滚动条的!
谢谢~~import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Frame1 extends JFrame {
    JPanel contentPane;
    GridLayout gridLayout1 = new GridLayout();
    JMenuBar jMenuBar1 = new JMenuBar();
    JMenu jMenu1 = new JMenu();
    JMenu jMenu2 = new JMenu();
    JMenuItem jMenuItem1 = new JMenuItem();
    JMenuItem j1 = new JMenuItem();
    JMenuItem jMenuItem3 = new JMenuItem();
    JMenuItem jMenuItem4 = new JMenuItem();
    TextArea t1 = new TextArea();    public Frame1() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(gridLayout1);
        contentPane.add(t1);
        this.setJMenuBar(jMenuBar1);
        setSize(new Dimension(400, 300));
        setTitle("编辑器");
        jMenu1.setText("文件");
        jMenu2.setText("编辑");
        j1.setText("打开");
        j1.addActionListener(new Frame1_jMenuItem2_actionAdapter(this));
        jMenuItem1.setText("退出");
        jMenuItem1.addActionListener(new Frame1_jMenuItem1_actionAdapter(this));
        jMenuItem4.setText("字体");
        jMenuItem3.setText("颜色");
        jMenuBar1.add(jMenu1);
        jMenuBar1.add(jMenu2);
        jMenu1.add(j1);
        jMenu1.add(jMenuItem1);
        jMenu2.add(jMenuItem4);
        jMenu2.add(jMenuItem3);
    }    public void jMenuItem1_actionPerformed(ActionEvent e) {
    System.exit(0);
    }    public void jMenuItem2_actionPerformed(ActionEvent e) {
        t1.setText(null);
        FileDialog fd=new  FileDialog(this, "打开文件");
                  fd.setVisible(true);
        String s1=fd.getDirectory()+fd.getFile();
        try
        {
          FileReader tt=new FileReader(s1);
          BufferedReader yy=new BufferedReader(tt);
          String s2=yy.readLine();
          while(s2!=null)
          {    t1.setText(t1.getText()+s2+"\n");
                s2=yy.readLine();
          }
          tt.close();
          yy.close();
        }
        catch(IOException yu)
                {        }    }
}
class Frame1_jMenuItem2_actionAdapter implements ActionListener {
    private Frame1 adaptee;
    Frame1_jMenuItem2_actionAdapter(Frame1 adaptee) {
        this.adaptee = adaptee;
    }    public void actionPerformed(ActionEvent e) {
        adaptee.jMenuItem2_actionPerformed(e);
    }
}class Frame1_jMenuItem1_actionAdapter implements ActionListener {
    private Frame1 adaptee;
    Frame1_jMenuItem1_actionAdapter(Frame1 adaptee) {
        this.adaptee = adaptee;
    }    public void actionPerformed(ActionEvent e) {
        adaptee.jMenuItem1_actionPerformed(e);
    }
}
原帖来自于网易社区:http://club.163.com/viewArticleByWWW.m?boardId=java&articleId=java_112fbdbfc9504be_0

Answer 1

TextArea t1 = new TextArea();
JScrollPane tools = new JScrollPane(t1);
contentPane.add(t1); // 改为 contentPane.add(tools);
就可以了