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How to let the user stop a java application

I have an application which mainly uses a bot to press keys when a condition is met. I am used to working with applets so I am wondering about how the user stops the application. I did it by using the task manager but that is not very user friendly, is it?
So how can I make I UI for a standalone java application? Or is there an other way to give the user the opportunity to stop the application?

You need to add a button to the GUI, set an action listener to it and in the addActionListener call the System.exit() method..
Example:
JButton showDialogButton = new JButton("Exit the app");
showDialogButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});

Do you have a JFrame?
If not Create a new JFrame, JPanel, and JButton with:
JFrame frame = new JFrame("title");
JPanel panel = new JPanel();
JButton button = new JButton("Close");
//You need this for the screen to show.
frame.setSize(width,height);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
//add the panel to the frame and the button to the panel
frame.add(panel);
panel.add(button);
button.addActionListener(this);//the class needs to implements ActionListener
frame.setVisible(true);
//this is the actionperformed method which will run if the button is clicked.
public void actionPerformed(ActionEvent e) {
if(e.getSource==button){//If you have more than one button.
System.exit(0);
}
}

JFrame: All the frames close when I try to close just one of them

public class Scratch {
public static void main(String[] args) {
Dimension d = new Dimension(300,300);
JFrame frame1 = new JFrame("Frame-1");
JFrame frame2 = new JFrame("Frame-2");
frame1.setSize(250,250);
frame2.setSize(d);
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.setVisible(true);
frame2.setVisible(true);
}
}
When I run this, the two frames show up as expected, but when I close one of them, both of them close. I want to achieve the functionality where only the frame I click 'x' on closes and the other remains open until I click the 'x' on it. How do I do it?

frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
The "EXIT" tells the JVM to stop so all the windows are closed:
So you could be using:
frame1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame2.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
Then only the frame you click on will close. When both frames are closed the JVM will exit.
However, that is not a good solution. An application should generally only have a single JFrame and then use a JDialog for a child window. Using this approach the code would be:
JDialog dialog = new JDialog(frame1);
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
Depending on you requirement you would make the dialog modal or non-modal.
Using this approach the JVM will exit when you close the frame however it will stay open when you close a child dialog.
Read this forum question about multiple JFrames: The Use of Multiple JFrames: Good or Bad Practice?. It will give more thoughts on why using 2 JFrames is not a good idea.

public class Scratch {
public static void main(String[] args) {
Dimension d = new Dimension(300,300);
JFrame frame1 = new JFrame("Frame-1");
JFrame frame2 = new JFrame("Frame-2");
frame1.setSize(250,250);
frame2.setSize(d);
frame1.setVisible(true);
frame2.setVisible(true);
}
}
you add one of them to your frame.
setVisible(false);
dispose();
setDefaultCloseOperation(DISPOSE_ON_CLOSE);

JFrame stuck, i can't move across sreen

I made a frame with some labels and a button on it, created an executable ear and now when i start it i can't move the application on my screen. Sometimes it works, sometimes it doesn't. I just can't drag the thing..
JFrame frame = new JFrame("Name");
frame.setPreferredSize(new Dimension(260, 160));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton exitButton = new JButton("Exit");
exitButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent arg0) {
System.exit(0);
}
});
frame.add(exitButton, BorderLayout.SOUTH);
frame.add(vertBox, BorderLayout.CENTER);
frame.setVisible(true);
frame.pack();
frame.setLocationRelativeTo(null);
Any ideas what's wrong? It's really annoying that i can't move it.
P.S. There is a code part that i skipped, where i made the labels and added them

Perhaps (in the code you didn't show) you were disabling your frame through
frame.setEnabled(false);
PS: I know it has been 2 years since you asked the question, but it might help someone else

Closing a JFrame using a button in eclipse

I'm a rookie when it comes to programming. We have this project about a log-in profile account. I just started doing it; and I came across a specific problem. I want to close a frame using a button.
buttonenter.setText("Enter");
buttonenter.addActionListener(new ActionListener (){
public void actionPerformed (ActionEvent ae){
}
});
I tried placing my frame.dispose();, set.Visible(false) etc. but i just got an error. I don't quite get. I really appreciate the help! Thank you!

Here's a simple example of what you're trying to do. What errors are you receiving?
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton btnClose = new JButton("CLOSE");
btnClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frame.setVisible(false);
}
});
frame.getContentPane().add(btnClose, BorderLayout.NORTH);
}

from JButtons ActionListener you can to call
JFrame#dispose(); (terminating current JVM)
JFrame#setVisible(false); (hide JFrame)
System.exit(0); (terminating current JVM)
and/or with (another standard ways are)
setDefaultCloseOperation();
add WindowListener and override proper event windowClosing();

when you close any objects by false visible, actually you just hide that object whereas the object stays in the memory yet.
you better use the
frame.dispatchEvent(new windowEvent(frame,windowEvent.window_closeing)); method

Why doesnt my JButton always pop up on a GUI?

So im making a game, and i want a jbutton to pop up in the window and when you click it you can log in. the problem is that when i start the game, it doesnt always pop up, which is kind of annoying. the only think would be the problem is the order im doing things. here is the code:
public static void createWindow() {
ImagePanel panel = new ImagePanel(
new ImageIcon(backgroundFile).getImage()); //used for the background
JButton login = new JButton(new AbstractAction("Login") {
public void actionPerformed(ActionEvent e) {
Login.createWindow();
}
});
login.setBounds(300, 300, 100, 100);
frame.getContentPane().add(panel); //sets the background to a pic
frame.setJMenuBar(MenuBar.menuBarCreator()); creates the menu bar
frame.pack();
frame.setResizable(false);
frame.setTitle("*Game Title* Beta 0.0.1 ADMINISTRATOR VERSION");
frame.setSize(ImagePanel.img.getWidth(null),
ImagePanel.img.getHeight(null));
frame.setLocation(Monitor.setLocationHeight(),
Monitor.setLocationWidth());
frame.setVisible(true);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
StreamingLineSound.start(soundFile); //starts a music file
frame.add(login);
}
any help would be fantastic. so basically all i want is an idea why it doesnt pop up all the time. thanks

Code line frame.setVisible(true); must be last line in the public static void createWindow() {, because you display JFrame and thenafter add frame.add(login);