Simple windowed application: Difference between revisions

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<lang java>import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

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import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.SwingUtilities;

public class Clicks extends JFrame ~~implements ActionListener~~{

public class Clicks extends JFrame{

private long clicks = 0;

private JLabel label;

private JButton clicker;

private String text;

public Clicks(){

super("Clicks");//set window title

text = "There have been no clicks yet";

label = new JLabel(~~text~~);

JLabel label = new JLabel("There have been no clicks yet");

clicker = new JButton("click me");

JButton clicker = new JButton("click me");

clicker.addActionListener(~~this);~~//listen to the button

clicker.addActionListener(//listen to the button

new ActionListener(){

@Override

⚫

public void actionPerformed(ActionEvent e) {

⚫

label.setText("There have been " + (++clicks) + " clicks");//change the text

⚫

}

⚫

}

);

setLayout(new BorderLayout());//handles placement of components

add(label,BorderLayout.CENTER);//add the label to the biggest section

add(clicker,BorderLayout.SOUTH);//put the button underneath it

label.setPreferredSize(new Dimension(300,100));//nice big label

setSize(300,200);//stretch out the window

label.setHorizontalAlignment(JLabel.CENTER);//text not up against the side

pack();//fix layout

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//stop the program on "X"

setVisible(true);//show it

}

public static void main(String[] args){

SwingUtilities.invokeLater( //Swing UI updates should not happen on the main thread

new Clicks();//call the constructor where all the magic happens

() -> new Clicks() //call the constructor where all the magic happens

}

);

⚫

public void actionPerformed(ActionEvent ~~arg0~~) {

if(arg0.getSource() == clicker){//if they clicked the button

⚫

~~text =~~ "There have been " + (++clicks) + " clicks";

label.setText(text);//change the text

⚫

}

⚫

}

}</lang>