遍历map的几种方法

佚名 6年前 (2019-05-05) 随笔 1034人围观抢沙发百度已收录

1，取key

Map<String,String> map=new HashMap<String,String>();

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

map.get(key);

}

2，取value

Map<String,String> map=new HashMap<String,String>();

for(String value:map.values){

System.out.println("value = "+value);

}

3，最常用

Map<String, String> map = new HashMap<String, String>();

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

System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());

}

4，iterator

Map<String, String> map = new HashMap<String, String>();

Iterator<Map.Entry<String, String>> entries = map.entrySet().iterator();

while (entries.hasNext()) {

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

System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());

}