Question

How to use for each loop with HashMap and entrySet in Java

Answer 1

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

public class MyClass {
    public static void main(String args[]) {
        HashMap<String, Integer> hmp = new HashMap<String, Integer>();
   
        hmp.put("java", 4);
        hmp.put("c++", 2);
        hmp.put("c", 6);
        hmp.put("python", 5);
        hmp.put("c#", 1);
        hmp.put("php", 3);
        
        Set<Map.Entry<String, Integer>> entrySet = hmp.entrySet();

        for (Map.Entry<String, Integer> entry : entrySet) {
            System.out.printf("%s : %d %n", entry.getKey(), entry.getValue());
        }
    }
}




/*
run:
      
c# : 1 
c++ : 2 
python : 5 
java : 4 
c : 6 
php : 3 
      
*/

 

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Answer 2

import java.util.HashMap;
import java.util.Set;

public class MyClass {
    public static void main(String args[]) {
        HashMap<String, Integer> hmp = new HashMap<String, Integer>();
   
        hmp.put("java", 4);
        hmp.put("c++", 2);
        hmp.put("c", 6);
        hmp.put("python", 5);
        hmp.put("c#", 1);
        hmp.put("php", 3);
        
        hmp.entrySet().forEach(entry -> {
            System.out.println(entry.getKey() + " : " + entry.getValue());
        });
    }
}




/*
run:
      
c# : 1
c++ : 2
python : 5
java : 4
c : 6
php : 3
      
*/

 

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