遍历Map的4种方法

//1，取key

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

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());
}