JAVA中HashMap遍历以及排序代码

HashMap遍历

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

            HashMap<String,String> map=new HashMap<String,String>();
            Scanner scanner=new Scanner(System.in);
            String name=scanner.next();
            String hobby=scanner.next();
            map.put(name, hobby);
            Collection list=map.values();//转换成集合都是values只有values，，要是都输出就是keyset
            Iterator it=list.iterator();
            while(it.hasNext())
            {
                System.out.println(it.next());
            }
            System.out.println(map.get(name));
            map.remove(name);
            System.out.println(map.size());
    }
}

HashMap排序

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class Main{
    public static void main(String[] args){

    HashMap<String,Integer> map=new HashMap<String,Integer>();
        map.put("Kobe",24);
        map.put("James",6);
        map.put("Durant",35);
        map.put("Anthony",7);

        List list=new ArrayList(map.keySet());
        //map变成集合list,对keyset进行排序,只有key(对新生成的list进行排序)
        Collections.sort(list, new Comparator<String>(){
        //list固定,按照String进行排序
                @Override
                public int compare(String o1, String o2) {
                    // TODO Auto-generated method stub
                    return o1.compareTo(o2);
                }       
        });
        System.out.println(map.get("Kobe"));
            Iterator it=list.iterator();
            while(it.hasNext())
            {   
             String s=(String) it.next();  
                System.out.println(s+"="+map.get(s)); 
          }

    }
}