退出标志

import lombok.SneakyThrows;

import java.text.SimpleDateFormat;

public class T {

    static boolean flag = true;

    @SneakyThrows
    public static void main(String[] args) {

        Thread thread1 = new Thread(() -> {
            try {
                while (flag) {
                    Thread.sleep(3000);
                    System.out.println(Thread.currentThread().getName() + ":"
                            + new SimpleDateFormat("yyyy-MM-dd hh:mm:ss SSS").
                            format(System.currentTimeMillis()));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }, "线程1");

        thread1.start();

        Thread.sleep(6000);
        flag = false;
    }
}

interrupt()

打断阻塞的线程（sleep/wait/joing），线程会抛出InterruptException异常
打断正常的线程，可以根据打断状态标记是否退出线程

阻塞线程

import lombok.SneakyThrows;

import java.text.SimpleDateFormat;

/*
线程1:2024-08-14 11:53:44 437
java.lang.InterruptedException: sleep interrupted
	at java.lang.Thread.sleep(Native Method)
	at T.lambda$main$0(T.java:16)
	at java.lang.Thread.run(Thread.java:748)
**/
public class T {

    static boolean flag = true;

    @SneakyThrows
    public static void main(String[] args) {

        Thread thread1 = new Thread(() -> {
            try {
                while (true) {
                    Thread.sleep(3000);
                    System.out.println(Thread.currentThread().getName() + ":"
                            + new SimpleDateFormat("yyyy-MM-dd hh:mm:ss SSS").
                            format(System.currentTimeMillis()));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }, "线程1");

        thread1.start();

        Thread.sleep(6000);
        thread1.interrupt();
    }
}

非阻塞线程

import lombok.SneakyThrows;

import java.text.SimpleDateFormat;

/*
正常退出
**/
public class T {

    static boolean flag = true;

    @SneakyThrows
    public static void main(String[] args) {

        Thread thread1 = new Thread(() -> {
            try {
                while (true) {
                    System.out.println(Thread.currentThread().getName() + ":"
                            + new SimpleDateFormat("yyyy-MM-dd hh:mm:ss SSS").
                            format(System.currentTimeMillis()));
                    Thread currentThread = Thread.currentThread();
                    boolean interrupted = currentThread.isInterrupted();
                    if (interrupted) {
                        System.out.println("打断状态" + interrupted);
                        break;
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }, "线程1");

        thread1.start();

        Thread.sleep(1000);
        thread1.interrupt();
    }
}

stop()

stop方法的作用是强制结束线程，就和kill -9一个效果，如果用stop来停止线程会直接结束线程，无视线程中对数据逻辑操作的完整性，这样是不安全。

import lombok.SneakyThrows;

import java.text.SimpleDateFormat;

public class T {
    @SneakyThrows
    public static void main(String[] args) {

        Thread thread1 = new Thread(() -> {
            try {
                while (true) {
                    Thread.sleep(3000);
                    System.out.println(Thread.currentThread().getName() + ":"
                            + new SimpleDateFormat("yyyy-MM-dd hh:mm:ss SSS").
                            format(System.currentTimeMillis()));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }, "线程1");

        thread1.start();

        Thread.sleep(7000);
        thread1.stop();
    }
}