java 多线程ThreadLocal-优快云博客

本文链接：https://blog.youkuaiyun.com/luobing_csdn/article/details/88341531

本文通过一个具体的示例程序，展示了如何使用Java中的ThreadLocal来确保每个线程拥有独立的副本数据，避免了线程间的数据干扰。同时介绍了ThreadLocal的基本原理及其实现方式。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >



import java.util.Random;

/***
 * 线程内独享数据 ,多个线程内操作的数据互不干扰. 
 * ThreadLocal 底层 采用的是 ThreadLocalMap 
 * 自己实现的话就是 可以采用   Map<Thread.currentThread().getName(),value> 
 * (个人理解 勿喷)
 */
public class ThreadLocalTest {

	/**
	 * @param args
	 */
	private static ThreadLocal<Integer> x=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().getName()+" has put data "+data);
						x.set(data);
						MyThreadLocalData.getInstance().setName("name"+data);
						MyThreadLocalData.getInstance().setAge(data);
						new A().get();
						new B().get();
					}
				}
			).start();

		}
	}

	static class A{

		public void get(){
			int data =x.get();
			System.out.println("A from "+Thread.currentThread().getName()+" get Date :"+data);
		}
	}

	static class B{
		public void get(){
			int data =x.get();
			MyThreadLocalData mtld=MyThreadLocalData.getInstance();
			System.out.println("B from "+Thread.currentThread().getName()+" get Date :"+mtld.getName()+" --age--"+mtld.getAge());
			System.out.println("B from "+Thread.currentThread().getName()+" get Date :"+data);
		}
	}
}

class MyThreadLocalData{
	private int age;
	private String name;
	private MyThreadLocalData(){} 
	private static ThreadLocal<MyThreadLocalData> map=new ThreadLocal<MyThreadLocalData>();

	public static MyThreadLocalData getInstance(){
		MyThreadLocalData data=map.get();
		if(data==null){
			data=new MyThreadLocalData();
			map.set(data);
		}
		return data;
	}

	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}

}