Question

*15.7 (Change color using a mouse) Write a program that displays the color of a circle as red when the mouse button is pressed and as blue when the mouse button is released. Please complete using Java language

Answer 1

ChangeColor.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
// implement mouselistener for work with mouse events
public class ChangeColor extends JFrame implements MouseListener
{
boolean flag=false;
public ChangeColor() // constructor
{
setTitle("Change Circle Color On Mouse Action"); // set title to the jframe
setSize(500,500); // set size of the jframe
// when user clicks X button then jframe will be close
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true); // setting jframe visible
addMouseListener(this); // add mouse listener

}
public void paint(Graphics g)
{
super.paint(g);
if(flag) // if mouse button is pressed then
g.setColor(Color.BLACK);
else // if mouse button is released then
g.setColor(Color.WHITE);
g.fillOval(100,100,300,300); // draws filled oval
}

// overriding all mouse listener methods
@Override
public void mousePressed(MouseEvent e)
{
flag=true;
repaint();
}
@Override
public void mouseReleased(MouseEvent e)
{
flag=false;
repaint();
}
@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 mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
public static void main(String args[])
{
new ChangeColor(); // creating anonymous object of ChangeColor class
}
}

Output

C:\Users\AKSHAY\Desktop>javac ChangeColor.java

C:\Users\AKSHAY\Desktop>java ChangeColor

Mouse Button is Pressed

Mouse Button is Released