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assert checkInvariants

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Articles by assert checkInvariants

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并发源码分析ConcurrentHashMap线程集合_java_脚本之家

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By float loadFactor, assert checkInvariants
| 脚本之家
简介 ConcurrentHashMap是一个线程安全的集合,底层是通过对指定索引位置上的节点进行加锁,而不是对整个数组加锁,当一个线程对指定索引位置上的节点加了锁之后,其它线程就不能对该索引位置上的节点进行操作,但可以对其它的索引位置上的节点操作,ConcurrentHashMap与HashMap有许多相似的地方,ConcurrentHashMap只是在一些产生线程安全的地方加了锁,如果对HashMap了解的话,再来看ConcurrentHashMap就简单许多。 常量 /** 数组最大容量大小(1073741824) */ private static final int MAXIMUM_CAPACITY = 1 << 30; /** 默认的初始容量大小 */ private static final int DEFAULT_CAPACITY = 16; /** 默认的并发等级 */ private static final int DEFAULT_CONCURRENCY_LEVEL = 16; /** 负载因子 */ private static final float...
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