Example analysis of how Java creates threads
Inherit Thread, use anonymous inner class here
@Slf4j(topic = "c.Test1")
public class Test1 {
public static void main(String[] args) {
//创建线程对象
Thread t = new Thread(){
@Override
public void run() {
//要执行的任务
log.debug("running");
}
};
//设置线程的名字
t.setName("t1");
//启动线程
t.start();
log.debug("running");
}
}
/*
19:44:31.998 [main] DEBUG c.Test1 - running
19:44:31.998 [t1] DEBUG c.Test1 - running
*/implement Runnable interface, cooperate with Thread class, also use anonymous inner class
separate threads and tasks
Thread represents the thread
Runnable represents the runnable task
@Slf4j(topic = "c.Test2")
public class Test2 {
public static void main(String[] args) {
Runnable runnable = new Runnable() {
@Override
public void run() {
//要执行的任务
log.debug("running");
}
};
//创建线程对象
Thread t = new Thread(runnable, "t2");
//启动线程
t.start();
}
}
//19:52:27.646 [t2] DEBUG c.Test2 - runningIn javajava, there is @ The FunctionalInterface@FunctionalInterface annotation means that the interface has only one abstract method, which can be simplified by lambdalambda expression
@Slf4j(topic = "c.Test2")
public class Test2 {
public static void main(String[] args) {
Runnable runnable = () -> {
//要执行的任务
log.debug("running");
};
//创建线程对象
Thread t = new Thread(runnable, "t2");
//启动线程
t.start();
}
}FutureTask with Thread
Because FutureTask can interface a Callable type parameter, used Handling situations with return values
@Slf4j(topic = "c.Test3")
public class Test3 {
public static void main(String[] args) throws ExecutionException, InterruptedException {
//创建任务对象
FutureTask<Integer> task = new FutureTask<>(() -> {
log.debug("running");
Thread.sleep(1000);
return 100;
});
/*
用lambda化简前
*/
FutureTask<Integer> task1 = new FutureTask<>(new Callable<Integer>() {
@Override
public Integer call() throws Exception {
log.debug("running");
Thread.sleep(1000);
return 100;
}
});
//参数1是任务的对象， 参数2是线程的名字
Thread t = new Thread(task, "t3");
t.run();
//主线程堵塞，同步等待task执行完毕的结果
Integer integer = task.get();
log.debug("结果是:{}", integer);
}
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