Question

How to loop over HashMap keys in Java

Answer 1

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

public class MyClass {
    public static void main(String args[]) {
        HashMap<String, Integer> hashmap = new HashMap<>();

        hashmap.put("java", 1);
        hashmap.put("c", 2);
        hashmap.put("c++", 3);
        hashmap.put("python", 4);

        Set<String> keys = hashmap.keySet();

        for (String key : keys) {
            System.out.println(key);
        }
    }
}



/*
run:

c++
python
java
c

*/

 

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