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The first one is answered as follows. Help with the second one.  package test; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class JavaApplication1 { public static void main(String[] arguments) { JFrame.setDefaultLookAndFeelDecorated(true); JFrame frame = new JFrame("print X and Y Coordinates"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.setSize(500,400); final JTextField output = new JTextField();; frame.add(output,BorderLayout.SOUTH); frame.addMouseListener(new MouseListener() { public void mousePressed(MouseEvent me) { } public void mouseReleased(MouseEvent me) { } public void mouseEntered(MouseEvent me) { } public void mouseExited(MouseEvent me) { } public void mouseClicked(MouseEvent me) {

The first one is answered as follows. Help with the second one.  package test; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class JavaApplication1 { public static void main(String[] arguments) { JFrame.setDefaultLookAndFeelDecorated(true); JFrame frame = new JFrame("print X and Y Coordinates"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.setSize(500,400); final JTextField output = new JTextField();; frame.add(output,BorderLayout.SOUTH); frame.addMouseListener(new MouseListener() { public void mousePressed(MouseEvent me) { } public void mouseReleased(MouseEvent me) { } public void mouseEntered(MouseEvent me) { } public void mouseExited(MouseEvent me) { } public void mouseClicked(MouseEvent me) {

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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The first one is answered as follows. Help with the second one. 

package test;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JavaApplication1 {

public static void main(String[] arguments) {

JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("print X and Y Coordinates");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLayout(new BorderLayout());
frame.setSize(500,400);

final JTextField output = new JTextField();;
frame.add(output,BorderLayout.SOUTH);

frame.addMouseListener(new MouseListener() {
public void mousePressed(MouseEvent me) { }
public void mouseReleased(MouseEvent me) { }
public void mouseEntered(MouseEvent me) { }
public void mouseExited(MouseEvent me) { }
public void mouseClicked(MouseEvent me) {
int x = me.getX();
int y = me.getY();
output.setText("Coordinate X:" + x + "|| Coordinate Y:" + y);
}
});

frame.setVisible(true);
}
}

Questions 1. Printing click coordinates. Build a custom subclass of JComponent which listens for MouseEvents, after observing a click, it should just print the coordinates, as in "Click detected at (X,Y)." (but with actual coordinates for X and Y). This means your class should also implement the MouseListener interface, and register itself as a listener in the constructor. Write a main method which creates a new JFrame and adds an instance of your class to the frame. Name your custom class EventLabCanvas (or anything else you prefer. You may want to refer to lecture code posted on May 30th to get started. 2. Drawing circles centered on clicks. Add code to make your canvas draw a small filled circle on itself when it receives a mouseClicked event. The circle should be centered on the location of the click. (Hint: use JComponent.getGraphics () and Graphics.fil10val() in your implementation of the mouseClicked method.) 3. Connecting circles with lines. Modify your canvas so that it draws lines between the centers of the circles as you create them. See Figure 1 for an example. Hint: use instance variables to store most recent click coordinates (or MouseEvent) and getGraphics () and Graphics.drawLine () to draw the line in mouseClicked) Make circles draggable when placing them. Have your program draw small filled circles as the mouse is dragged, and make the connecting line move too. Use Graphics.setColor and set color to Color.WHITE to erase the previous graphic when dragging. You will need to implement the MouseMotionListener interface, and to call addMouseMotionListener as appropriate. 4.
Transcribed Image Text:Questions 1. Printing click coordinates. Build a custom subclass of JComponent which listens for MouseEvents, after observing a click, it should just print the coordinates, as in "Click detected at (X,Y)." (but with actual coordinates for X and Y). This means your class should also implement the MouseListener interface, and register itself as a listener in the constructor. Write a main method which creates a new JFrame and adds an instance of your class to the frame. Name your custom class EventLabCanvas (or anything else you prefer. You may want to refer to lecture code posted on May 30th to get started. 2. Drawing circles centered on clicks. Add code to make your canvas draw a small filled circle on itself when it receives a mouseClicked event. The circle should be centered on the location of the click. (Hint: use JComponent.getGraphics () and Graphics.fil10val() in your implementation of the mouseClicked method.) 3. Connecting circles with lines. Modify your canvas so that it draws lines between the centers of the circles as you create them. See Figure 1 for an example. Hint: use instance variables to store most recent click coordinates (or MouseEvent) and getGraphics () and Graphics.drawLine () to draw the line in mouseClicked) Make circles draggable when placing them. Have your program draw small filled circles as the mouse is dragged, and make the connecting line move too. Use Graphics.setColor and set color to Color.WHITE to erase the previous graphic when dragging. You will need to implement the MouseMotionListener interface, and to call addMouseMotionListener as appropriate. 4.
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