Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;

public class Main implements ActionListener {
    JTextField jtf = new JTextField(10);

    JButton jbtnGetTextUpper = new JButton("Get Text In Uppercase");

    Main() {
        JFrame jfrm = new JFrame("Demonstrate a Text Field");
        jfrm.setLayout(new FlowLayout());
        jfrm.setSize(240, 140);
        jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jtf.setActionCommand("TF");

        jtf.addActionListener(this);
        jbtnGetTextUpper.addActionListener(this);

        jtf.addCaretListener(new CaretListener() {
            public void caretUpdate(CaretEvent ce) {
                System.out.println("Text in real time: " + jtf.getText());
            }
        });

        jfrm.add(jtf);
        jfrm.add(jbtnGetTextUpper);
        jfrm.setVisible(true);
    }

    public void actionPerformed(ActionEvent ae) {
        if (ae.getActionCommand().equals("TF")) {
            System.out.println("ENTER key pressed: " + jtf.getText());
        } else {
            String str = jtf.getText().toUpperCase();
            System.out.println("Button pressed: " + str);
        }
    }

    public static void main(String args[]) {
        new Main();
    }
}