Question

How to safely get a value from HashMap in Java

Answer 1

import java.util.HashMap;

public class MyClass {
    public static void main(String args[]) {
        HashMap<String, Integer> hashmap = new HashMap<>();
 
        hashmap.put("java", 11);
        hashmap.put("c", 22);
        hashmap.put("c++", 33);
        hashmap.put("python", 44);
 
        int r1 = hashmap.getOrDefault("java", -1); 
        int r2 = hashmap.getOrDefault("php", -1); 

        System.out.println(r1);
        System.out.println(r2);
    }
}
 
 
 
/*
run:
 
11
-1
 
*/

 

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