Question

How to add value to HashMap elements to ArrayList in Java

Answer 1

import java.util.ArrayList;
import java.util.Map.Entry;
import java.util.HashMap;

public class MyClass {
    public static void main(String args[]) {
        HashMap<String, Integer> hashmap = new HashMap<>();
  
        hashmap.put("java", 3);
        hashmap.put("c++", 4);
        hashmap.put("c", 1);
        hashmap.put("swift", 5);
        hashmap.put("python", 2);
        
        ArrayList<Entry<String, Integer>> al = new ArrayList<>();
        
        al.addAll(hashmap.entrySet());
        
        System.out.println(al);
    }
}
  
  
  
  
/*
run:
  
[c++=4, python=2, java=3, c=1, swift=5]
  
*/

 

 

70+ SQL courses for beginners and professionals