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Articles by break findIndex

并发编程--------JUC集合_奔跑的码农小哥的博客-CSDN博客

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By assert checkInvariants, break findIndex
| CSDN
一、ConcurrentHashMap ConcurrentHashMap是线程安全的HashMap ConcurrentHashMap在JDK1.8中是以CAS+synchronized实现的线程安全 CAS：在没有hash冲突时（Node要放在数组上时） synchronized：在出现hash冲突时（Node存放的位置已经有数据了） 存储的结构：数组+链表+红黑树 1.2.1 put方法 public V put(K key, V value) { return putVal(key, value, false); } 1.2.2 putVal方法-散列算法 final V putVal(K key, V value, boolean onlyIfAbsent) { if (key == null || value == null) throw new NullPointerException(); int hash = spread(key.hashCode()); int binCount = 0; } static final int spread(int h) {...
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JAVA数据结构篇--13线程安全的Set 集合

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By Copy OnWrite ArraySet.add, break findIndex
| CSDN
前言：java 中用于存放不重复元素的set 集合，其中无序的HashSet，以及有序的LinkedHashSet和TreeSet 都是非线程安全的，那么多线程环境下，我们要存放不重复的元素，需要使用哪种集合进行数据存取； 1 使用： Set<User> set = Collections.synchronizedSet(new LinkedHashSet<>(10, 0.75f)); CopyOnWriteArraySet<User> copyOnWriteArraySet = new CopyOnWriteArraySet<>(); Set<User> setFromMap = Collections.newSetFromMap(new ConcurrentHashMap<>()); User userOne = new User(); userOne.setId(1).setName("lisi").setAge(20); set.add(userOne); copyOnWriteArraySet.add(userOne); setFromMap.add(userOne);...
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