Question

How to use lambda expression to display HashMap in Java

Answer 1

package javaapplication1;

import java.util.HashMap;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            HashMap<String, String> hash = new HashMap<>();
            hash.put("java", "3 programmers");
            hash.put("c", "5 programmers");
            hash.put("c++", "2 programmers");
            hash.put("c#", "1 programmers");

            hash.forEach((s1, s2) -> System.out.println(s1 + " - " + s2 + " : " + s1.length()));

        } catch (Exception e) {
            System.out.println(e.toString());
        }
    }
}

/*
               
run:
  
c# - 1 programmers : 2
c++ - 2 programmers : 3
java - 3 programmers : 4
c - 5 programmers : 1
      
 */

 

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