Help with Drawing a line

[Rgfirefly24]

I am trying to create an application that divides the client area of the screen into 4 equally sized canvases. EAch canvas should have a different color. I must create at least one of the colors. Also for every two mouse clicks in a particular canvas, that canvas should draw a line between the two mouse click points.

here are my .java files.

Lab6Draw.java=

Code:

import javax.swing.*;
import java.lang.*;
import java.io.*;
import java.util.*;
import java.awt.*;

public class Lab6Draw{
	public static void main(String[] args) throws Exception{
		Grid frame = new Grid();
		frame.setTitle("Lab6 - Application #1");
		frame.setSize(400,300);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setLocationRelativeTo(null);



	}
}

Grid.java = 
import javax.swing.*;
import java.lang.*;
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.Color.*;

public class Grid extends JFrame{
	 public Grid(){
		JPanel p1 = new JPanel(new FlowLayout());
		Color color = new Color(50,100,75);
		p1.setBackground(color);
		p1.setForeground(color);
		p1.add(new newPanel());


		JPanel p2 = new JPanel(new FlowLayout());
		p2.setBackground(Color.red);
		p2.setForeground(Color.blue);

		JPanel p3 = new JPanel(new FlowLayout());
		p3.setBackground(Color.blue);
		p3.setForeground(Color.red);

		JPanel p4 = new JPanel(new FlowLayout());
		p4.setBackground(Color.green);
		p4.setForeground(Color.yellow);

		JPanel p5 = new JPanel();
		p5.setLayout(new GridLayout(2,2,1,1));
		p5.add(p1);
		p5.add(p2);
		p5.add(p3);
		p5.add(p4);

		this.add(p5);



	}
}

Drawing.java = 
import javax.swing.*;
import java.lang.*;
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.Color.*;

class Drawing extends JFrame {
	public Drawing(){
		add(new newPanel());
	}
}

newPanel.java = 

import javax.swing.*;
import java.lang.*;
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Graphics;

class newPanel extends JPanel
	implements MouseListener{
		public int x1= -1;
		public int y1= -1;
		public int x2= -1;
		public int y2= -1;

		public newPanel(){
		 // Register listener for the mouse event
		    addMouseListener(this);
		    }

		  public void mouseClicked(MouseEvent e) {
		  }

		  public void mouseEntered(MouseEvent e) {
		  }

		  public void mouseExited(MouseEvent e) {
		  }

		  public void mouseReleased(MouseEvent e) {
		  }

		  public void mousePressed(MouseEvent e) {
			if (x1 == -1){
			   	x1 = e.getX();
			   	y1 = e.getY();
			}
			else{
				x2 = e.getX();
				y2 = e.getY();
			}
		  }

  	protected void paintComponent(Graphics g){
		super.paintComponent(g);
		g.setColor(Color.black);
		g.drawLine(x1,y1,x2,y2);
	}
}

[hardwired]

Code:

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

public class L6D{
	public static void main(String[] args) throws Exception{
		Grid frame = new Grid();
		frame.setTitle("Lab6 - Application #1");
		frame.setSize(400,300);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setLocationRelativeTo(null);
	}
}

class Grid extends JFrame{
	public Grid(){
		Color[] bgColors = {
			new Color(50,100,75), Color.red,
			Color.green.darker(), Color.blue
		};
		Color[] fgColors = {
			Color.orange, Color.blue,
			Color.yellow, Color.red
		};
		JPanel panel = new JPanel();
		panel.setLayout(new GridLayout(2,2,1,1));
		for(int j = 0; j < bgColors.length; j++) {
			panel.add(new NewPanel(bgColors[j], fgColors[j]));
		}

		this.add(panel);
	}
}

class NewPanel extends JPanel implements MouseListener{
	Color color;
	public int x1= 0;
	public int y1= 0;
	public int x2= -1;
	public int y2= -1;

	public NewPanel(Color bg, Color fg){
		setBackground(bg);
		color = fg;
		// Register listener for the mouse event
		addMouseListener(this);
	}

	public void mouseClicked(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}
	public void mouseReleased(MouseEvent e) {}

	public void mousePressed(MouseEvent e) {
		if (x1 != x2 || y1 != y2){
		   	x1 = e.getX();
		   	y1 = e.getY();
			x2 = x1;
			y2 = y1;
		} else {
			x2 = e.getX();
			y2 = e.getY();
		}
		repaint();
	}

  	protected void paintComponent(Graphics g){
		super.paintComponent(g);
		g.setColor(color);
		g.drawLine(x1,y1,x2,y2);
	}
}