1，建立一個類Queue，代表隊列（特點：先進先出），新增add（Object obj）及get（）方法，mian（）方法驗證。

package com.bdqn.demo;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.NoSuchElementException;

public class Queue {
	private List<Object> arrayList = new ArrayList<Object>();
    private LinkedList<Object> linkedList = new LinkedList<Object>();
 
    //ArrayList實現的先進先出
    public void arrayListAdd(Object obj) {
        this.arrayList.add(obj);
    }
 
    public Object arrayListGet() {
        Object obj = null;
        if (this.arrayList.size() > 0) {
            obj = this.arrayList.get(0);
            this.arrayList.remove(0);
        }
        return obj;
    }
 
    //LinkedList實現的先進先出
    public void linkedListAdd(Object obj) {
        this.linkedList.addFirst(obj);
    }
     
    @SuppressWarnings("finally")
    public Object linkedListGet(){
        Object obj = null;
        try {
            obj = this.linkedList.getLast();
            this.linkedList.removeLast();
        } catch (NoSuchElementException e) {
        }finally{
            return obj;
        }
    }
     
    public static void main(String[] args) {
        Queue queue = new Queue();
        //測試ArrayList，新增0 1 2進去
        for (int i = 0; i < 3; i++){
            System.out.println("arrayListAdd("+i+")");
            queue.arrayListAdd(i);
        }
        //輸出4次，第4次應該為null，輸出順序和放入順序一致
        for (int i = 0; i < 4; i++) {
            System.out.println("arrayListGet()=="+queue.arrayListGet());
        }
         
        //測試Linkedlist，新增0 1 2進去
        for (int i = 0; i < 3; i++){
            System.out.println("linkedListAdd("+i+")");
            queue.linkedListAdd(i);
        }
        //輸出4次，第4次應該為null，輸出順序和放入順序一致
        for (int i = 0; i < 4; i++) {
            System.out.println("linkedListGet()=="+queue.linkedListGet());
        }
    }
}
 

package com.bdqn.demo;

public class Student {
     private String name;//學生姓名
     private int score;//分數
     public Student( String name,int score) {//過載接收引數
    	 this.name=name;
    	 this.score=score;
     }
	public String getName() {//獲取名字
		return name;
	}
	public int getScore() {//獲取分數
		return score;
	}
     
}

package com.bdqn.demo;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

//測試類
public class Test {
    public static void main(String[] args) {
    	//學生引數傳遞
    	Student stu1=new Student("張三", 99);
    	Student stu2=new Student("李四", 80);
    	Student stu3=new Student("王五", 86);
    	Student stu4=new Student("趙六", 72);
		Map <String,Student>score=new HashMap<String,Student>();//宣告HashMap
		//新增學生引數集合
		score.put(stu1.getName(),stu1);
		score.put(stu2.getName(),stu2);
		score.put(stu3.getName(),stu3);
		score.put(stu4.getName(),stu4);
        for(String key:score.keySet()) {//foreach列印
        	System.out.println(key+"\t"+score.get(key).getScore());
        }
	     stu4=new Student("趙六",76);//修改一名學生成績
	     score.put(stu4.getName(), stu4);//新增修改的資料
	     System.out.println("修改後的學員成績如下：");//列印修改後的學生成績
	     for(String key:score.keySet()) {
	        	System.out.println(key+"\t"+score.get(key).getScore());
	        }
		}
	
	
}