How to select value based on index on linkedhashmap-CodePudding

I have some data on linkedhasmap and i want to call first 2 data on linkedhasmap . how can i get 2 data from linkedhashmap. I just want call value 1 and value 2.

here the code

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

    map.put(1, "value 1");
    map.put(2, "value 2");
    map.put(3, "value 3");

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

      for(int i=0; i<3;i  ){
              if (entry.getKey().equals(i)){

        System.out.println(entry.getValue(i));

        }
      }

CodePudding user response：

Modify your code like this to get the first two values, LinkedHashMap is ordered and preserves the order of insertion.


int count = 0;
for (Map.Entry<Integer, String> entry : map.entrySet()) {
  if (count == 2) {
    break;
  }
  System.out.println(entry.getValue());
  count  ;
}

CodePudding user response：

You can use entrySet() method to get Set of Map.Entry object that represents key value pairs. Here is example for that:

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

map.put(1, "value 1");
map.put(2, "value 2");
map.put(3, "value 3");

int count = 0;
for (Map.Entry<String,String> entry : map.entrySet()){
    if (count >= 2) {
        break;
    }
    System.out.println(entry.getValue());
    count  ;
}

You can iterate over the first two lelemets as shown in the above using enchanced for loop.