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- 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);
- fruits.put("watermelon", null);
- System.out.println("1. Is key 'apple' exists?");
- if (fruits.containsKey("apple")) {
- //key exists
- System.out.println("yes! - " + fruits.get("apple"));
- } else {
- //key does not exists
- System.out.println("no!");
- }
- System.out.println("\n2. Is key 'watermelon' exists?");
- if (fruits.containsKey("watermelon")) {
- System.out.println("yes! - " + fruits.get("watermelon"));
- } else {
- System.out.println("no!");
- }
- }
- }
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