80 lines
2.0 KiB
Java
80 lines
2.0 KiB
Java
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import java.util.Stack;
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public class StackImpl<E>
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{
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private Stack<E> stack;
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/** Creates an empty Stack. **/
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public StackImpl()
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{
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stack = new Stack<E>();
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}
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/** Tests if this stack is empty. **/
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public boolean empty()
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{
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return stack.empty();
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}
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/**
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* Looks at the object at the top of this stack without removing it from the
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* stack.
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**/
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public E peek()
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{
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return stack.peek();
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}
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/**
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* Removes the object at the top of this stack and returns that object as
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* the value of this function.
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**/
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public E pop()
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{
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return stack.pop();
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}
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/** Pushes an item onto the top of this stack. **/
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public E push(E item)
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{
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return stack.push(item);
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}
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/** Returns the 1-based position where an object is on this stack. **/
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public int search(Object o)
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{
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return stack.search(o);
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}
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public static void main(String...arg)
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{
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StackImpl<Integer> stack = new StackImpl<Integer>();
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System.out.println("element pushed : " + stack.push(3));
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System.out.println("element pushed : " + stack.push(4));
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System.out.println("element pushed : " + stack.push(-19));
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System.out.println("element pushed : " + stack.push(349));
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System.out.println("element pushed : " + stack.push(35));
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System.out.println("element poped : " + stack.pop());
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System.out.println("element poped : " + stack.pop());
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System.out.println("Element peek : " + stack.peek());
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System.out.println("position of element 349 " + stack.search(3));
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while (!stack.empty())
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{
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System.out.println("element poped : " + stack.pop());
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}
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}
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}
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/*
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element pushed : 3
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element pushed : 4
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element pushed : -19
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element pushed : 349
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element pushed : 35
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element poped : 35
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element poped : 349
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Element peek : -19
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position of element 349 3
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element poped : -19
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element poped : 4
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element poped : 3
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