Java – Check if key exists in HashMap

In Java, you can use the

Map.containsKey()

method to check if a key exists in a

Map

.

TestMap.java

package com.mkyong.test;

import java.util.HashMap;
import java.util.Map;

public class TestMap {

public static void main(String[] args) {

Map<String, Integer> fruits = new HashMap<>();
fruits.put("apple", 1);
fruits.put("orange", 2);
fruits.put("banana", 3);

if(fruits.containsKey("apple")){
//key exists
System.out.println(fruits.get("apple"));
}else{
//key not exists
}

}

}
···
Output
···
1
···
Alternatively, just check the `null` value like this :
###`TestMap.java`

package com.mkyong.test;

import java.util.HashMap;

import java.util.Map;

public class TestMap {

public static void main(String[] args) {

Map<String, Integer> fruits = new HashMap<>();
fruits.put("apple", 1);
fruits.put("orange", 2);
fruits.put("banana", 3);

Integer appleQty = fruits.get("apple");
if(appleQty!=null){
//key exists
System.out.println(appleQty);
}else{
//key not exists
}

}

}

Output

1

“`