import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

public class Java8Template {

    public static void main(String[] args) {

        Map<String,Integer>items=new HashMap<>();

        items.put("A",10);

        items.put("B",20);

        items.put("C",30);

        items.put("D",40);

        items.put("E",50);

        items.put("F",60);

        //1.使用entrySet的迭代器

        Iterator iter1=items.entrySet().iterator();

        while(iter1.hasNext()){

            Map.Entry<String,Integer> entry=(Map.Entry<String,Integer>)iter1.next();

            System.out.println("Item :"+entry.getKey()+" Count:"+entry.getValue());

        }

        //2.使用keySet的迭代器

        Iterator iter2=items.keySet().iterator();

        while(iter2.hasNext()){

            String key=(String) iter2.next();

            System.out.println("Item :"+key+" Count:"+items.get(key));

        }

        //3.使用for循环利用EntrySet进行遍历

        for(Map.Entry<String,Integer>entry:items.entrySet()){

            System.out.println("Item :"+entry.getKey()+" Count:"+entry.getValue());

        }

        //4.使用for循环利用keySet进行遍历

        for (String key:items.keySet()){

            System.out.println("Item :"+key+" Count:"+items.get(key));

        }

        //5.java8中使用forEach进行遍历

        items.forEach((k,v)-> System.out.println("Item :"+k+" Count:"+v));

    }

}