java实现多线程范围内的数据共享-优快云博客

本文深入探讨了在多线程环境下，如何从使用HashMap过渡到ThreadLocal来优化共享数据的管理。通过实例代码展示了在并发场景下，ThreadLocal相较于传统HashMap的优势及具体应用方式，旨在提升程序的并发性能和数据安全性。

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代码如下，比较坑爹，就是上一篇文章的hashmap改为了ThreadLocal

public class ThreadScopeShareData {

	/**
	 * @param args
	 */
//	private static HashMap<Thread, Integer> map = new HashMap<Thread, Integer>();
	private static ThreadLocal<Integer> threadLocal = new ThreadLocal<Integer>();
	public static void main(String[] args) {
		for(int i=0;i<2;i++){
			new Thread(new Runnable() {
				@Override
				public void run() {
					int data = new Random().nextInt();
					System.out.println(Thread.currentThread() +" data is "+data);
//					map.put(Thread.currentThread(), data);
					threadLocal.set(data);
					new A().get();
					new B().get();
				}
			}).start();

		}

	}

	static class A{妹,希望你能理解

		public void get(){
			int data = threadLocal.get();//map.get(Thread.currentThread());
			System.out.println("A get data:" + data + " from " + Thread.currentThread().getName());
		}
	}
	
	static class B{
		public void get(){
			int data = threadLocal.get();//map.get(Thread.currentThread());
			System.out.println("B get data:" + data + " from " + Thread.currentThread().getName());
		}
	}
	
}