import java.awt.*; import java.awt.event.*; import java.awt.geom.*; public class

Question

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;

public class projectheba1 extends Frame implements
    MouseListener
{
    

    int upperLeftX, upperLeftY, width, height, x1, y1, x2, y2;
    int numpress = 0;
    
    TextField position = new TextField();
    
    private void initializeTextField()
    {
        position.setLocation(5,  575);
        position.setSize(70, 20);
        position.setBackground(Color.white);
        add(position);
    }
    
    protected void displayMouseCoordinates(int X, int Y)
    {
        position.setText("[" + String.valueOf(X)+ "," + String.valueOf(Y)+"]");
    }
    
    public void mousePressed(MouseEvent event)
    {
        upperLeftX= 0; upperLeftY =0; width = 0; height = 0;
        x1 = event.getX();
        y1 = event.getY();
        x2 = event.getX();
        y2 = event.getY();
        Graphics g = getGraphics();
        displayMouseCoordinates(event.getX(), event.getY());
        numpress = numpress +1;
    }
    
    
public void paint(Graphics g) {
     
    initializeTextField();
    addMouseListener(this);
    displayMouseCoordinates(x1, y1);
    
    int p1 = 0, p2 = 0, p3 = 0, p4 = 0;
    if(numpress == 1)
    {
        p1 = x1;
        p2 = y1;
    }
    else
    {
        p3 = x2;
        p4 = y2;
    }
    Line2D line1 = new Line2D.Double(p1, p2, p3, p4);
    Stroke drawingStroke = new BasicStroke(2);
    Graphics2D graph = (Graphics2D)g;
    graph.setStroke(drawingStroke);
    graph.setPaint(Color.red);
      graph.draw(line1);

}

  public static void main(String args[]) {
  Frame frame = new projectheba1();
  frame.addWindowListener(new WindowAdapter(){
  public void windowClosing(WindowEvent we){
  System.exit(0);
}
  });
  frame.setSize(800, 600);
  frame.setVisible(true);
}
}

what in the world is wrong with this code, it runs and i can see the points of the mouse for x and y but i cant seem to save them in variables and use them to calculate what i need

Explanation / Answer

One big mistake I can see is if you are implementing the mouseListener, then you have to implement all the methods of it. You have implemented just 1 which is mousePressed. You have to implement remaining 4. Even if you are not doing anything, you can keep the body of the methods blank. These methods are

@Override

public void mouseClicked(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

}

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