자바 HashMap.containsKey()

1 개요

자바 HashMap .containsKey()

import java.util.HashMap;
public class MyClass {
	public static void main(String[] args) {
		HashMap<String,Object> hm = new HashMap<String,Object>();
		hm.put("first", "1");
		hm.put("second", "4");

		System.out.println( hm.containsKey("first") ); // true
		System.out.println( hm.containsKey("third") ); // false
	}
}

2 같이 보기

• 자바 HashMap
• 함수 containsKey()

3 참고

• https://www.mkyong.com/java/java-check-if-key-exists-in-hashmap/
• http://docs.oracle.com/javase/8/docs/api/java/util/Map.html#containsKey-java.lang.Object-