Java Stack与Queue详解

package StackPack;

import java.util.Stack;
public class StackDemo {
    public static void main(String[] args) {
        Stack<Integer> stack=new Stack<>();

        for(int i=0;i<10;i++)
        {
            stack.push(i*2);
        }
        //[0, 2, 3, 4, 6, 8, 12, 14, 16, 18]
        System.out.println(stack.peek());  //18
        System.out.println(stack.search(14));  //以1为基数，
        // 返回最近出现位置到栈顶距离，因此为3
        while(!stack.isEmpty())
        {
            System.out.print(stack.pop()+"\t");
        }
        System.out.println();

        System.out.println(stack.search(1));  //找不到，返回-1


    }
}

package QueuePack;

import java.util.*;
public class QueueDemo {
    public static void main(String[] args) {
        Queue<Integer> queue=new ArrayDeque<>();
        for(int i=0;i<10;i++)
        {
            queue.offer(i*2);
        }

        Iterator<Integer> it=queue.iterator();
        while(it.hasNext())
        {
            System.out.print(it.next()+"\t"); //0	2	4	6	8	10	12	14	16	18
        }
        System.out.println();

        System.out.println(queue.peek()); //0
        System.out.println(queue.poll());  //0,同时队列变成[2,4,6,8,10,12,14,16,18]
        
    }
}

package QueuePack;

import java.util.*;
public class QueueDemo {
    public static void main(String[] args) {
        Queue<Integer> queue=new ArrayDeque<>();
        for(int i=0;i<10;i++)
        {
            queue.offer(i*2);
        }

        Iterator<Integer> it=queue.iterator();
        while(it.hasNext())
        {
            System.out.print(it.next()+"\t"); //0	2	4	6	8	10	12	14	16	18
        }
        System.out.println();

        System.out.println(queue.peek()); //0
        System.out.println(queue.poll());  //0,同时队列变成[2,4,6,8,10,12,14,16,18]
        
    }
}