Question

// Ex.: SaverJPanel.java // Program simulates a simple screen saver import java.awt.Color; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.awt.Graphics; import java.util.Random; import javax.swing.JPanel; import javax.swing.Timer; public class SaverJPanel extends JPanel implements ActionListener { //random-number generator private static final Random random = new Random(); private Timer timer; // constructor sets window's title bar string and dimensions public SaverJPanel() { timer = new Timer(1000, this); // create the timer, every 1000 milliseconds, the timer triggers an event on the panel timer.start(); } // end SaverJPanel constructor // draw lines public void paintComponent(Graphics g) { super.paintComponent(g); int x, y, x1, y1; //TO DO: //use for loop to draw 100 lines //select x, y, x1, y1 coordinates to be random numbers between 0 and 300 //set color to be random RGB value //call graphics draw line between point (x,y) and point (x1, y1) } // end method paintComponent // repaint JPanel public void actionPerformed(ActionEvent actionEvent) { repaint(); } // end method actionPerformed } // end class SaverJPanel

          // Ex.: SaverJPanel.java
// Program simulates a simple screen saver
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Graphics;
import java.util.Random;
import javax.swing.JPanel;
import javax.swing.Timer;
public class SaverJPanel extends JPanel implements ActionListener
{
//random-number generator
private static final Random random = new Random();
private Timer timer;
// constructor sets window's title bar string and dimensions
public SaverJPanel()
{
    timer = new Timer(1000, this); // create the timer, every 1000 milliseconds, the timer triggers an event on the panel
    timer.start();
} // end SaverJPanel constructor
// draw lines
public void paintComponent(Graphics g)
{
    super.paintComponent(g);
    int x, y, x1, y1;
    //TO DO:
    //use for loop to draw 100 lines
    //select x, y, x1, y1 coordinates to be random numbers between 0 and 300
    //set color to be random RGB value
    //call graphics draw line between point (x,y) and point (x1, y1)
} // end method paintComponent
// repaint JPanel
public void actionPerformed(ActionEvent actionEvent)
{
    repaint();
} // end method actionPerformed
} // end class SaverJPanel

// Ex.: SaverJPanel.java
// Program simulates a simple screen saver
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Graphics;
import java.util.Random;
import javax.swing.JPanel;
import javax.swing.Timer;
public class SaverJPanel extends JPanel implements ActionListener

//random-number generator
private static final Random random = new Random();
private Timer timer;
// constructor sets window's title bar string and dimensions
public SaverJPanel()

timer = new Timer(1000, this); // create the timer, every 1000 milliseconds, the timer triggers an event on the panel
timer.start();
// end SaverJPanel constructor
// draw lines
public void paintComponent(Graphics g)

super.paintComponent(g);
int x, y, x1, y1;
//TO DO:
//use for loop to draw 100 lines
//select x, y, x1, y1 coordinates to be random numbers between 0 and 300
//set color to be random RGB value
//call graphics draw line between point (x,y) and point (x1, y1)
// end method paintComponent
// repaint JPanel
public void actionPerformed(ActionEvent actionEvent)

repaint();
// end method actionPerformed
// end class SaverJPanel

Added by Alex F.

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