Question

How to join a map into a string in Java

Answer 1

import java.util.Map;
import java.util.HashMap;
import java.util.stream.Stream;
import java.util.stream.Collectors;

public class MyClass {
    public static void main(String args[]) {
        
        Map<Integer, String> mp = new HashMap<>();
        
        mp.put(1, "java");
        mp.put(2, "c");
        mp.put(3, "c++");
        mp.put(4, "c#");
        mp.put(5, "rust");

        String result = mp.entrySet().stream()
                    .map(entry -> entry.getKey() + " = " + entry.getValue())
                    .collect(Collectors.joining(", "));

        System.out.println(result);
    }
}
  
  
  
  
/*
run:
  
1 = java, 2 = c, 3 = c++, 4 = c#, 5 = rust
  
*/

 

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