I want to add a mouselistener to mt JFrame frame but when i do frame.addMouseListener(this) i get an error that i cannot use this in a static method
I am making an application that detects a click of the mouse then displays it in int clicks
code
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class numberOfClicks implements MouseListener{
static int clicks = 0;
@Override
public void mouseClicked(MouseEvent e) {
clicks++;
}
static JTextField text = new JTextField();
static String string = clicks+" Clicks";
static JFrame frame = new JFrame("Click Counter");
public static void frame(){
Font f = new Font("Engravers MT", Font.BOLD, 23);
text.setEditable(false);
text.setBackground(Color.BLUE);
text.setFont(f);
text.setForeground(Color.GREEN);
text.setBorder(BorderFactory.createLineBorder(Color.BLUE));
text.setText(string);
frame.add(text, BorderLayout.SOUTH);
frame.setResizable(false);
frame.setSize(300, 300);
frame.getContentPane().setBackground(Color.BLUE);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.addMouseListener(this);
}
public static void main(String[] args){
frame();
}
@Override
public void mousePressed(MouseEvent e) {}
@Override
public void mouseEntered(MouseEvent e) {}
@Override
public void mouseExited(MouseEvent e) {}
@Override
public void mouseReleased(MouseEvent e) {}
}
this
doesn't exist in a static method since a static method is a method of the class, not of the object (the owner of this
). Solution: get rid of all statics from your code above. None of your fields or methods above should be static other than the main method.
Edit
And as Andrew Thompson correctly states, add the MouseListener to a JPanel that is added to the JFrame's contentPane.
Edit 2
mousePressed(...)
method rather than the mouseClicked(...)
since the former is less persnickety about accepting presses.mousePressed(...)
method since just changing the clicks value isn't enough to change the display.e.g.,
JPanel mainPanel = new JPanel();
mainPanel.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
clicks++;
text.setText(clicks + " Clicks");
}
});
// add mainPanel to the JFrame...