Java

//---------------------------------------------------------------------------- 
// List.java 
//---------------------------------------------------------------------------- 
class List 
{ 
   private class Node 
   {  int col; 
      double val; 
      Node next, prev; 
      
      Node (int c, double v) { col = c; val = v; next = prev = null; } 
      
      public String toString() { 
         return String.format (" (%2d, %5.2f)", col, val); 
      } 

      public boolean equals(Node E) { return (this.val == E.val); } 
      } 
    
   private Node front, back, current; 
   private int row, length; 

   List(int r) { front = back = current = null; row = r; length = 0; } 
    
   void insertAfterLast(Node N) 
   {  Node node = new Node(N.col, N.val); 
      
      if ( this.length == 0 ) 
      { this.front = this.back = node; 
      }else { 
         node.prev = this.back; 
         this.back.next = node; 
         this.back = node; 
         this.current = node; 
      } 
      this.length++; 
   } 

   public String toString() 
   {  String str = ""; 
      for(Node N = front; N != null;  N = N.next) 
      {  if ( N == front ) { str = String.format ("%3d:", row); } 
         str += N.toString() + (N.next==null?"\n":""); 
      } 
      return str; 
   } 
} 

//---------------------------------------------------------------------------- 
// ListTest.java - A test client for the List ADT 
//---------------------------------------------------------------------------- 
class ListTest 
{ 
   private class Entry 
   {  int col; 
      double val; 
      Entry next, prev; 
      
      // Entry Constructor 
      Entry (int c, double v) { col = c; val = v; next = prev = null; } 
   } 

   public static void main(String[] args) 
   {  int i; 
      List A = new List(1); 
      List B = new List(2); 
      
      Entry Ea = new Entry(0, 0.0); 
      for(i=1; i<=4; i++){ 
         Ea.col = i; 
         Ea.val = Double.parseDouble(Integer.toString(i)); 
         A.insertAfterLast(Ea); 
         Ea.val = Double.parseDouble(Integer.toString(10-2*i)); 
         B.insertAfterLast(Ea); 
         Ea.val = Double.parseDouble(Integer.toString(9-2*i)); 
         B.insertAfterLast(Ea); 
      } 
      
      System.out.println(" "); 
      System.out.println("Print Lists A and B which have been initialized");       
      System.out.println("A = " + A); 
      System.out.println("B = " + B); 
      
   } 
} 

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

public class Circleline extends JApplet 
{
	public void paint(Graphics g) 
	{
		Dimension d = getSize();
		int x = (int) d.getWidth();
		int y = (int) d.getHeight();
		g.drawLine(5, 5, x / 10, y / 10);
		g.drawRect(5, 5, x / 10, y / 10);
		g.fillRect(5 + x / 10 + 5 + 3, 5 + 3, x / 10 - 6, y / 10 - 10);
		g.drawRect(5 + x / 10 + 5, 5, x / 10, y / 10);
		g.drawOval(5 + x / 10 + 5 + x / 10 + 5 + 1, 5 + 1, x / 10 - 6,y / 10 - 10);
		g.drawRect(5 + x / 10 + 5 + x / 10 + 5, 5, x / 10, y / 10);
	}

	public void init() 
	{
		setSize(400, 400); 
	}
}