package cn.burce.HashMap;

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

//Map的實現類HashMap

public class Mapdemo1 {
    public static void main(String[] args) {
        fun();
        fun1();
    }

    public static void fun() {
        Map<String, Integer> map = new
 
 HashMap<String, Integer>();
        map.put("abc", 1);
        map.put("abcd", 2);
        map.put("abcde", 3);
        map.put("abcde", 4);
        map.put("abcdef", 4);
        System.out.println(map);// 列印map
        System.out.println(map.get("abcde"));// 通過鍵取值，沒有鍵返還null
    }

    public static
 
 void fun1() {
        HashMap<String, Integer> map = new HashMap<>();
        map.put("測試1", 1);
        map.put("測試2", 2);
        map.put("測試3", 3);
        map.put("測試4", 4);
        // 迭代器的步驟取值
        Set<String> set = map.keySet();
        Iterator<String> it = set.iterator();
        
 
while (it.hasNext())
        {
            String s = it.next();
            int i = map.get(s);
            System.out.println(s + "...." + i);
        }
        System.out.println("----------------------------------");
        // 程式碼簡化的foreach取值
        for (String key : map.keySet())
        {
            System.out.println(key + "...." + map.get(key));
        }
    }
}