ThreadLocalAssignment.java

// 김상희

class UserTask implements Runnable {
    private ThreadLocal<String> threadLocalValue;
    private String userInfo;

    public UserTask(ThreadLocal<String> threadLocal, String userInfo) {
        this.threadLocalValue = threadLocal;
        this.userInfo = userInfo;
    }

    @Override
    public void run() {
        threadLocalValue.set(userInfo);
        System.out.println(Thread.currentThread().getName() + " 로그인: " + threadLocalValue.get());
        threadLocalValue.remove();
    }
}

public class ThreadLocalAssignment {
    public static void main(String[] args) {
        ThreadLocal<String> threadLocalValue = new ThreadLocal<>();

        Thread  thread1 = new Thread(new UserTask(threadLocalValue, "사용자 A"));
        Thread  thread2 = new Thread(new UserTask(threadLocalValue, "사용자 B"));

        thread1.start();
        thread2.start();
    }
}