public class TestProxy {
//线程本地存储变量
private static final ThreadLocal<Integer> THREAD_LOCAL_NUM = new ThreadLocal<Integer>() {
@Override
protected Integer initialValue() {
return 0;
}
};
public static void main(String[] args) {
for (int i = 0; i <3; i++) {//启动三个线程
Thread t = new Thread() {
@Override
public void run() {
add10ByThreadLocal();
}
};
t.start();
}
}
/**
* 线程本地存储变量加 5
*/
private static void add10ByThreadLocal() {
for (int i = 0; i <5; i++) {
Integer n = THREAD_LOCAL_NUM.get();
n += 1;
THREAD_LOCAL_NUM.set(n);
System.out.println(Thread.currentThread().getName() + " : ThreadLocal num=" + n);
}
}
}
运行结果：
Thread-0 : ThreadLocal num=1 Thread-0 : ThreadLocal num=2 Thread-0 : ThreadLocal num=3 Thread-0 : ThreadLocal num=4 Thread-0 : ThreadLocal num=5 Thread-1 : ThreadLocal num=1 Thread-1 : ThreadLocal num=2 Thread-1 : ThreadLocal num=3 Thread-1 : ThreadLocal num=4 Thread-1 : ThreadLocal num=5 Thread-2 : ThreadLocal num=1 Thread-2 : ThreadLocal num=2 Thread-2 : ThreadLocal num=3 Thread-2 : ThreadLocal num=4 Thread-2 : ThreadLocal num=5
线程共享的变量，但又互不影响。是线程安全的。
