HashSet

HashSet

HashSet<Integer> h = new HashSet<>();

h.add(e);
h.contains(e);
h.remove(e);
h.size();
h.getOrDefault(k,default_val); 
h.clear();

값 출력

HashSet<Integer> set = new Hashset<Integer>(Arrays.asList(1, 2, 3));
// 전체 출력
System.out.println(set);

Iterator iter = set.iterator();
while(iter.hasNext()) {
    System.out.println(iter.next());
}

Ref

• https://coding-factory.tistory.com/554

set to array

Set<String> set = new HashSet<String>();

//populate set

for (String s : set) {
    System.out.println(s);
}

[Java] 배열을 Set으로, Set을 배열로 변환하기TISTORY

loop

How to Iterate over a Set/HashSet without an Iterator?Stack Overflow

basic

[자바/java] Set, HashSet 사용법 데이터 삽입, 삭제, 출력TISTORY