Raw type test program. - Java Object Oriented Design

Java examples for Object Oriented Design:Generic Class

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Description

Raw type test program.

Demo Code

import java.util.ArrayList;

class EmptyStackException extends RuntimeException
{
   // no-argument constructor
   public EmptyStackException()
   {//from   ww  w.  j a  v  a2 s. c o  m
      this("Stack is empty");
   } 

   // one-argument constructor
   public EmptyStackException(String exception)
   {
      super(exception);
   } 
}
class Stack<T>  
{
   private final ArrayList<T> elements; // ArrayList stores stack elements

   // no-argument constructor creates a stack of the default size
   public Stack()
   {
      this(10); // default stack size
   } 

   // constructor creates a stack of the specified number of elements
   public Stack(int capacity)
   {
      int initCapacity = capacity > 0 ? capacity : 10; // validate
      elements = new ArrayList<T>(initCapacity); // create ArrayList
   }

   // push element onto stack
   public void push(T pushValue)
   {
      elements.add(pushValue); // place pushValue on Stack
   } 

   // return the top element if not empty; else throw EmptyStackException
   public T pop()
   {
      if (elements.isEmpty()) // if stack is empty
         throw new EmptyStackException("Stack is empty, cannot pop");

      // remove and return top element of Stack
      return elements.remove(elements.size() - 1); 
   }
}

public class Main 
{
   public static void main(String[] args) 
   {
      Double[] doubleElements = {1.1, 2.2, 3.3, 4.4, 5.5};
      Integer[] integerElements = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

      // Stack of raw types assigned to Stack of raw types variable
      Stack rawTypeStack1 = new Stack(5); 

      // Stack<Double> assigned to Stack of raw types variable
      Stack rawTypeStack2 = new Stack<Double>(5);          

      // Stack of raw types assigned to Stack<Integer> variable
      Stack<Integer> integerStack = new Stack(10);            

      testPush("rawTypeStack1", rawTypeStack1, doubleElements);
      testPop("rawTypeStack1", rawTypeStack1);
      testPush("rawTypeStack2", rawTypeStack2, doubleElements);
      testPop("rawTypeStack2", rawTypeStack2);
      testPush("integerStack", integerStack, integerElements);
      testPop("integerStack", integerStack);
   }

   // generic method pushes elements onto stack
   private static <T> void testPush(String name, Stack<T> stack,
      T[] elements)
   {
      System.out.printf("%nPushing elements onto %s%n", name);

      // push elements onto Stack            
      for (T element : elements)         
      {
         System.out.printf("%s ", element);
         stack.push(element); // push element onto stack
      } 
   } 

   // generic method testPop pops elements from stack
   private static <T> void testPop(String name, Stack<T> stack)
   {
      // pop elements from stack
      try
      {
         System.out.printf("%nPopping elements from %s%n", name);
         T popValue; // store element removed from stack

         // remove elements from Stack
         while (true)
         {
            popValue = stack.pop(); // pop from stack
            System.out.printf("%s ", popValue);
         } 
      }
      catch(EmptyStackException emptyStackException)
      {
         System.out.println();
         emptyStackException.printStackTrace();
      }
   }
}

Result


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