JZTXT

Java

发布时间 2023-04-24 18:38:39作者: 你在学什么

HashSet

  • contains
  • add

Stack+

  • empty peek pop push(add) size

HashMap

  • valueOf(value)
  • get(key), put(key, value), isEmpty()
  • containsKey(key) containsValue(value) remove(key)
  • cnt.merge(x, 1, Integer::sum);

Queue

  • Queue q = new LinkedList<>();
  • PriorityQueue heap = new PriorityQueue();
  • offer(*) poll() peek() isEmpty()

ArrayDeque q = new ArrayDeque<>(); //双端队列

Deque q = new ArrayDeque<>();

  • peekFirst() peekLast() pollFirst() pollLast()
  • offerFirst(E e) offerLast(E e)

String s

  • s.charAt(i)
  • s.toCharArray()；

Arrays.fill
Arrays.sort

String.valueOf