多线程中范围内共享变量的概念与作用

<span style="font-size:24px;">import java.util.HashMap;
import java.util.Map;
import java.util.Random;
/*
 * 线程范围内共享变量的概念与作用，创建三个线程，都访问了三个对象
 * 第一个对象设置值，第二第三个对象取值，同一个线程设置的值，只能被相同的线程获取
 */
public class ThreadScopeShareDate {
	private static int data = 0;
	private static Map<Thread, Integer> threadData = new HashMap<Thread, 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);
					threadData.put(Thread.currentThread(), data);
					new A().get();
					new B().get();
				}
			}).start();
		}
	}

	static class A {
		public void get() {
			int data = threadData.get(Thread.currentThread());
			System.out.println("A from" + Thread.currentThread().getName()
					+ "has put data" + data);
		}
	}

	static class B {
		public void get() {
			int data = threadData.get(Thread.currentThread());
			System.out.println("B from" + Thread.currentThread().getName()
					+ "has put data" + data);
		}
	}

}
</span>