一个按钮的输出

Question

我写的一个倒数转换程序里面有转换按钮，清空和jTextField1三个部件，现在就是当我按下转换时这个输出不知道该怎么写jTextField1.setText(),他着个括号里面又要是String型这我就不知道该怎么办的！请大家指教指教谢谢
package untitled41;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import java.io.*;
/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */public class Frame1 extends JFrame {
  private int num1=0;
  private int j;
  JPanel contentPane;
  XYLayout xYLayout1 = new XYLayout();
  JButton jButton1 = new JButton();
  JTextField jTextField1 = new JTextField();
  JButton jButton2 = new JButton();  //Construct the frame
  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }  //Component initialization
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    jButton1.setText("转换");
    jButton1.addActionListener(new Frame1_jButton1_actionAdapter(this));
    contentPane.setLayout(xYLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("Frame Title");
    jTextField1.setText("");
    jButton2.setText("清空");
    jButton2.addActionListener(new Frame1_jButton2_actionAdapter(this));
    contentPane.add(jButton1,  new XYConstraints(51, 60, 65, 31));
    contentPane.add(jTextField1,   new XYConstraints(158, 80, 193, 30));
    contentPane.add(jButton2,    new XYConstraints(51, 107, 66, 31));
  }  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }  void jButton1_actionPerformed(ActionEvent e) {
if(e.getActionCommand()=="转换"){
num1=Integer.parseInt(((Choice)e.getSource()).getSelectedItem().trim());
      do{
            j=num1%10;
            num1/=10;
jTextField1.setText(); 
        }while(num1!=0);
  }
}  void jButton2_actionPerformed(ActionEvent e) {
jTextField1.setText("");   }
}class Frame1_jButton1_actionAdapter implements java.awt.event.ActionListener {
  Frame1 adaptee;  Frame1_jButton1_actionAdapter(Frame1 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jButton1_actionPerformed(e);
  }
}class Frame1_jButton2_actionAdapter implements java.awt.event.ActionListener {
  Frame1 adaptee;  Frame1_jButton2_actionAdapter(Frame1 adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jButton2_actionPerformed(e);
  }
}

Answer 1

void jButton1_actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("转换")){
num1=Integer.parseInt(((Choice)e.getSource()).getSelectedItem().trim());
StringBuffer szValue =new StringBuffer();
 do{
            j=num1%10;
            num1/=10;
            szValue.append(j);
   }while(num1!=0);
   jTextField1.setText(szValue.toString()); 
  }
}