I created a window with a button and 3 fields, 1st, 2nd field is the text, and in the 3rd field, it is necessary to write down words that are repeated in 1st & 2nd fields. How to make it?

        JFrame frame = new JFrame("new Frame");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        Label lbTextLabel = new Label("1:");
        lbTextLabel.setBounds(50, 10, 120, 20);
 
        Label lbTextLabel2 = new Label("2:");
        lbTextLabel2.setBounds(50, 50, 120, 20);
 
        Label lbTextLabel3 = new Label("3:");
        lbTextLabel3.setBounds(50, 90, 120, 20);
 
        JTextArea TextArea = new JTextArea("Welcome to javatpoint");
        TextArea.setBounds(50,30, 120,20);
 
        JTextArea TextArea2 = new JTextArea("Welcome to javatpoint 2");
        TextArea2.setBounds(50,70, 127,20);
 
        JTextArea TextArea3 = new JTextArea("");
        TextArea3.setBounds(50,110, 127,20);
 
        JButton button =new JButton("Click Here");
        button.setBounds(140,130,95,30);
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                
            }
        });

CodePudding user response：

You have to split both textarea word and check if first textarea word is matched with second textarea word, If match print it in third textarea.

Here down is example:

import java.awt.event.*;  
import javax.swing.*;    
import java.util.*;
class CompareWord{
    public static void main(String[] args) {
        JFrame f;
        JLabel lbTextLabelt1, lbTextLabel2, lbTextLabel3;
        JTextArea TextArea, TextArea2, TextArea3;
        JButton button;

        f = new JFrame("new Frame");
        lbTextLabelt1 = new JLabel("1:");
        lbTextLabelt1.setBounds(50, 10, 120, 20);

        lbTextLabel2 = new JLabel("2:");
        lbTextLabel2.setBounds(50, 70, 120, 20);

        lbTextLabel3 = new JLabel("3:");
        lbTextLabel3.setBounds(50, 140, 120, 20);

        TextArea = new JTextArea("Welcome to javatpoint");
        TextArea.setBounds(50,30, 120,30);

        TextArea2 = new JTextArea("Welcome to javatpoint");
        TextArea2.setBounds(50,90, 127,30);

        TextArea3 = new JTextArea("");
        TextArea3.setBounds(50,160, 127,30);

        button = new JButton("Click Here");
        button.setBounds(120,200,95,30);
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){

                String str1 = TextArea.getText();  //