Question

In java, Create a GUI which works as an accumulator

1. There is a textfield A which allows user to enter a number

2. There is also another textfield B with value start with 0.

3. When a user is done with entering the number in textfield A and press enter, calculate the sum of the number in textfield B and the number user just entered in textfield A, and display the updated number in textfield B

Answer 1

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class SumGUI {  
static    JFrame frame = new JFrame("JFrame Example");  
static JTextField B= new JTextField("0");
static JTextField A= new JTextField();

        public static void main(String s[]) {  
        JPanel panel = new JPanel();  
        panel.setLayout(null);  
        JLabel label1 = new JLabel("A");  
        label1.setBounds(200, 50, 100, 30);
        A.setBounds(320, 50, 100, 30);
        JLabel label2 = new JLabel("B");  
        label2.setBounds(200, 100, 100, 30);
        // password field
        B.setBounds(320, 100, 100, 30);
        
        
        
        A.addKeyListener(new KeyAdapter() {
                public void keyReleased(KeyEvent e) {
                
              }

              public void keyTyped(KeyEvent e) {
              }

              public void keyPressed(KeyEvent e) {
                  // if typed code is Enter on textfield than reversing the string
                  if(e.getKeyCode()==KeyEvent.VK_ENTER){
                          Integer sum = Integer.parseInt(A.getText())+Integer.parseInt(B.getText());
                          B.setText(sum.toString());
                  }
              }
                });
       
        panel.add(label1);
        panel.add(label2);
        panel.add(A);
        panel.add(B);
        frame.add(panel);
        frame.setSize(600, 300);  
        frame.setLocationRelativeTo(null);  
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
        frame.setVisible(true);  
    }  
}  

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