java并发之固定对象与实例 Immutable Objects An object is considered immutable if its state cannot change after it is constructed. Maximum reliance on immutable objects is widely accepted as a sound strategy for creating simple, reliable code. Immutable objects…
信号量 信号量类Semaphore,用来保护对唯一共享资源的访问.一个简单的打印队列,并发任务进行打印,加入信号量同时之能有一个线程进行打印任务 . import java.util.concurrent.Semaphore; public class PrintQueue { public PrintQueue() { semaphore = new Semaphore(1,true); } private final Semaphore semaphore; public void prin…
import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Semaphore; /** * Created by chengtao on 17/12/5. */public class Thread1401_Semaphore { public static void main(String[] args) { ExecutorServ…
在上篇博客中分析了hashmap的用法,详情查看java并发之hashmap 本篇博客重点分析下hashmap的源码(基于JDK1.8) 一.成员变量 HashMap有以下主要的成员变量 /** * The default initial capacity - MUST be a power of two. 默认初始容量 */ static final int DEFAULT_INITIAL_CAPACITY = 1 << 4; // aka 16 /** * The maximum capa…
