자바 HashMap.containsKey()

1 개요

자바 HashMap .containsKey()

HashMap<String,Object> hm = new HashMap<String,Object>();
hm.put("first", "1");
hm.put("second", "4");

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

2 같이 보기

• 자바 HashMap
• 함수 containsKey()

3 참고 자료

• 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-