JavaExercises/Java 1/swing/CounterApp.java at master · biblelamp/JavaExercises · GitHub

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import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JButton;

import javax.swing.SwingConstants;

import java.awt.BorderLayout;

import java.awt.Font;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

class CounterApp extends JFrame {

private int value;

public static void main(String[] args) {

new CounterApp(1);

}

public CounterApp(int initialValue) {

setTitle("Simple Counter");

setDefaultCloseOperation(EXIT_ON_CLOSE);

setSize(300, 120);

setLocationRelativeTo(null);

Font font = new Font("Arial", Font.BOLD, 42);

JLabel counterValueView = new JLabel();

counterValueView.setFont(font);

counterValueView.setHorizontalAlignment(SwingConstants.CENTER);

add(counterValueView, BorderLayout.CENTER);

value = initialValue;

counterValueView.setText(String.valueOf(value));

JButton decrementButton = new JButton("<");

decrementButton.setFont(font);

add(decrementButton, BorderLayout.WEST);

JButton incrementButton = new JButton(">");

incrementButton.setFont(font);

add(incrementButton, BorderLayout.EAST);

decrementButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

value--;

counterValueView.setText(String.valueOf(value));

}

});

incrementButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent actionEvent) {

value++;

counterValueView.setText(String.valueOf(value));

}

});

setVisible(true);

}

JavaExercises/Java 1/swing/CounterApp.java at master · biblelamp/JavaExercises · GitHub

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