如何修改HashMap中元素的值

Map map=new HashMap()

map.put("测试",1)

map.put("测试2",2)

System.out.println(map.get("测试2"))

map.put("测试2",3)

System.out.println(map.get("测试2"))

输出结果是 ： 2

3

1、用Object remove(Object key)方法从HashMap或者HashTable中移去待修改的key值对，该方法同时会返回该Key所对应的Object

2、用put(Object key, Object value) 将新的Key-Value重新放入HashMap(HashTable)

static String[] s1={"E","F","G","S","T","(",")","+","-","*","/","i","#"}

HashMap<String,List<String>>hashMap=new HashMap<String,List<String>>()

for(int i=5i<s1.lengthi++){

List list=new ArrayList()

list.add(s1[i])

hashMap.put(s1[i],list)

}

---