Add the code first
Create a new Thread, the code is as follows:
package com.thread.test;public class MyThread extends Thread { private String name; public MyThread(String name) { this.name = name; } @Override public void run() { for (int i = 0; i < 100; i++) { System.out.println(name+"["+i+"]"); } super.run(); }}Then create a new test class, the code is as follows:
package com.thread.test;/* * 0-50 executes the main thread, 50-100 executes the A thread, and the main thread will continue to be executed after the A thread is fully executed*/public class ThreadDemo{ public static void main(String[] args) { MyThread t = new MyThread("A"); t.start(); for (int i = 0; i < 100; i++) { if (i>50) { try { t.join(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println("main thread"+"["+i+"]"); } }}The following is an explanation of the Join method in Thread in the Java Platform SE8 API:
public final void join(long millis) throws InterruptedExceptionWaits at most millis millions milliseconds for this thread to die. A timeout of 0 means to wait forever. This implementation uses a loop of this.wait calls conditioned on this.isAlive. As a thread terminates the this.notifyAll method is invoked. It is recommended that applications not use wait, notify, or notifyAll on Thread instances.Parameters: millis - the time to wait in million seconds Throws: IllegalArgumentException - if the value of millis is negative InterruptedException - if any thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown.
Add the code first
Create a new Thread, the code is as follows:
package com.thread.test;public class MyThread extends Thread { private String name; public MyThread(String name) { this.name = name; } @Override public void run() { for (int i = 0; i < 100; i++) { System.out.println(name+"["+i+"]"); } super.run(); }}Then create a new test class, the code is as follows:
package com.thread.test;/* * 0-50 executes the main thread, 50-100 executes the A thread, and the main thread will continue to be executed after the A thread is fully executed*/public class ThreadDemo{ public static void main(String[] args) { MyThread t = new MyThread("A"); t.start(); for (int i = 0; i < 100; i++) { if (i>50) { try { t.join(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println("main thread"+"["+i+"]"); } }}The following is an explanation of the Join method in Thread in the Java Platform SE8 API:
public final void join(long millis) throws InterruptedExceptionWaits at most millis millions milliseconds for this thread to die. A timeout of 0 means to wait forever. This implementation uses a loop of this.wait calls conditioned on this.isAlive. As a thread terminates the this.notifyAll method is invoked. It is recommended that applications not use wait, notify, or notifyAll on Thread instances.Parameters: millis - the time to wait in million seconds Throws: IllegalArgumentException - if the value of millis is negative InterruptedException - if any thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown.
My own understanding is that it will forcefully enter the thread using the join method, and other threads will wait until the thread is fully executed before coming in.