Java_HashMap使用思路

package com.ahd.map;

public class Letter {
    private String name;
    private int count=1;
    
    
    
    public Letter() {
        super();
    }

    public Letter(String name, int count) {
        super();
        this.name = name;
        this.count = count;
    }
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getCount() {
        return count;
    }
    public void setCount(int count) {
        this.count = count;
    }
    
    
}

package com.ahd.map;

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

//HashMap的思路
public class Demo02 {
    public static void main(String[] args) {
        //创建HashMap
        Map<String,Letter> map=new HashMap<String,Letter>();
        
        //创建测试的字符串
        String str="this is my way but i fucking love you that is our dream";
        //切割字符串,转成字符串数组
        String []strArray=str.split(" ");
        
        //进行增强for循环,创建hashmap中key值
        for(String temp:strArray){
            
            if(!map.containsKey(temp)){
                map.put(temp, new Letter());
            }
            
            //计数设置
            Letter col=map.get(temp);
            col.setCount(col.getCount()+1);
        }
        
        
        //进行遍历 通过set集合来封装key
        Set<String> set=map.keySet();
        for(String key:set){
            System.out.println("key:"+key);
            System.out.println("value(count):"+map.get(key).getCount());
        }
    }
    
}