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我是 JAVA 的初学者。我的问题是我的 GUI 有一个按钮。如果按下按钮，它应该在 GUI 上打印一些文本。但是当我按下按钮时。它会显示一个全新的框架，然后显示文本。我怎样才能将所有内容保持在同一个框架中，每次按下按钮时，都会弹出新文本。

1.构建了整个GUI

package JuiceFactory;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class JuiceFactory extends JFrame{
    private CustomTextFeild customTextFeild;
    private CustomButton customButton;
    public JuiceFactory() {
        JFrame jf = new JFrame("Welcome to a Juice Factory");
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        JPanel jPanel = new JPanel();
        jPanel.setLayout(new BorderLayout(5,5));
                   jPanel.setBorder(BorderFactory.createLineBorder(Color.GRAY,10));

        customTextFeild = new CustomTextFeild();
        customButton = new CustomButton();


        jPanel.add(customTextFeild,BorderLayout.CENTER);
        jPanel.add(customButton,BorderLayout.EAST);

        customButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                      new Juice();
            }
        });


        jf.setContentPane(jPanel);
        jf.setLocationRelativeTo(null);
        jf.pack();
        jf.setVisible(true);
    }
    public void printMessage(String Message){
        customTextFeild.addText(Message);
    }
}

2.JButton的偏好

 class CustomButton extends JButton  {
    public static int Height = 20,Width=100;
    public CustomButton(){
        setOpaque(true);
        new JButton();
        setText("Order Juice");
    }
    public Dimension getPreferredSize(){
        return  (new Dimension(Width,Height)) ;
    }
}

3.JTextFeild 偏好

class CustomTextFeild extends JTextArea{
    private  static final int GAP = 5;
    public CustomTextFeild(){
        setOpaque(true);
        setBorder(BorderFactory.createLineBorder(Color.YELLOW,GAP,true));
        setLineWrap(true);
        setText("Juice Producing process.......\n");
    }
    public Dimension getPreferredSize(){
        return  (new Dimension(100,100)) ;
    }
    public void addText(String words){
        append(words+"\n");
    }
}

package JuiceFactory;
//where the program begins
public class Main  extends CustomTextFeild{

        public Main(){
             new Juice();
        }

        public static void main(String[] args) {


            JuiceFactory juiceFactory = new JuiceFactory();

        }
}

4.显示过程

package JuiceFactory;

public class Juice extends JuiceFactory implements Runnable{

    public Juice(){
        Thread t1 =  new Thread(this);
        t1.start();

    }

    @Override
    public void run() {
        try {
            printMessage("Put Fruits into the mixer.......");
            Thread.sleep(3000);
            printMessage("Juice is done！");
        } catch (InterruptedException e){
            e.printStackTrace();
        }
    }
}
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