配列とノード方式で実装されたスタック

package com.study.link;

public class ArrayStack {
	private Node[] objectArray;
	private int topIndex;
	public ArrayStack(int length){
		objectArray = new Node[length];
	}
	public Node pop(){
		if(topIndex>0){
			Node node = objectArray[topIndex-1];
			topIndex--;
			return node;
		}else{
			return null;
		}
	}
	public void push(Node node){
		topIndex++;
		objectArray[topIndex-1]=node;
	}
	public Node[] getObjectArray() {
		return objectArray;
	}
	public void setObjectArray(Node[] objectArray) {
		this.objectArray = objectArray;
	}
	public int getTopIndex() {
		return topIndex;
	}
	public void setTopIndex(int topIndex) {
		this.topIndex = topIndex;
	}
	
	public static void main(String[] args) {
		ArrayStack stack=new ArrayStack(100);  
        stack.push(new Node(1));  
        stack.push(new Node(2));  
        stack.push(new Node(3));  
        stack.push(new Node(4));  
        stack.push(new Node(5));  
        while(stack.getTopIndex()>0)  
        {  
            System.out.println(stack.pop().getValue());  
        }  
	}
}

package com.study.link;

/**
 *  
 *  
 * @author Administrator
 *
 */
public class NodeStack {
	private Node top;// 
	public Node pop(){
		if(top!=null){
			Object value = top.getValue();
			Node temp = new Node(value);
			top = top.getNext();
			return temp;
		}else{
			return null;
		}
	}
	public void push(Node node){
		if(node!=null){
			node.setNext(top);
			top = node;
		}else{
			top = node;
		}
	}
	public static void main(String[] args) {
		NodeStack stack=new NodeStack();  
        stack.push(new Node(1));  
        stack.push(new Node(2));  
        stack.push(new Node(3));  
        stack.push(new Node(4));  
        while(stack.top!=null)  
        {  
            System.out.println(stack.pop().getValue());  
        }  
	}
}

package com.study.link;
/**
 *  
 *  
 * @author Administrator
 *
 */
public class Node {
	private Object value;
	private Node next;
	public Node(Object value){
		this.value = value;
		next = null;
	}
	public Object getValue() {
		return value;
	}
	public void setValue(Object value) {
		this.value = value;
	}
	public Node getNext() {
		return next;
	}
	public void setNext(Node next) {
		this.next = next;
	}
}