question archive Consider the following Java program
Consider the following Java program
Subject:Computer SciencePrice:2.87 Bought7
Consider the following Java program. Which one of the following does NOT describe "MouseWhisperer"?
import java.awt.event.*;
import javax.swing.*;
public class MouseWhisperer extends JFrame implements MouseListener {
MouseWhisperer() {
super("COME CLOSER");
setSize(300,100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addMouseListener(this);
setVisible(true);
}
public void mouseClicked(MouseEvent e) { setTitle("OUCH"); }
public void mousePressed(MouseEvent e) { setTitle("LET GO"); }
public void mouseReleased(MouseEvent e) { setTitle("WHEW"); }
public void mouseEntered(MouseEvent e) { setTitle("I SEE YOU"); }
public void mouseExited(MouseEvent e) { setTitle("COME CLOSER"); }
public static void main(String[] args) { new MouseWhisperer(); }
}
Select one:
a. A "MouseWhisperer" object can be assigned to a "JFrame" variable.
b. A "MouseWhisperer" object listens for action events.
c. A "MouseWhisperer" object responds to mouse clicks.
d. A "MouseWhisperer" object responds to mouse movement.
e. The "MouseWhisperer" class can be run as a program.
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Answer :
b. A "MouseWhisperer" object listens for action events.
Action Listener lists for action events. Here we are implementing Mouse Listener which is an interface used for listening only mouse events (press, release, click, enter, and exit) on a component.
And,
We can assign "MouseWhisperer" object to a "JFrame" variable.
"MouseWhisperer" object responds to mouse clicks,mouse movement as we can observe the code.
public void mouseClicked(MouseEvent e) { setTitle("OUCH"); }
public void mousePressed(MouseEvent e) { setTitle("LET GO"); }
public void mouseReleased(MouseEvent e) { setTitle("WHEW"); }
public void mouseEntered(MouseEvent e) { setTitle("I SEE YOU"); }
public void mouseExited(MouseEvent e) { setTitle("COME CLOSER"); }
The "MouseWhisperer" class can be run as a program as main method is inside its class name.
