How to create and use Java language threads

Java is a high-level language that is widely used to develop various applications, especially enterprise-level applications. The Java language has many features, such as object-oriented, cross-platform, encapsulation, inheritance, multi-threading, etc. Among them, multi-threading is often used in Java development, mainly to improve the concurrency and responsiveness of the program. This article will introduce in detail the creation and use of Java language threads.

1. The basic concept of thread

Thread is the smallest unit of operating system scheduling, and thread is the smallest execution unit of a program. Threads in Java are instances of the Thread class, and each thread has its own stack and program counter. Java language supports multi-threading, the program can create multiple threads, and these threads can execute concurrently. There are five states of Java threads, namely New (new), Runnable (ready), Blocked (blocked), Waiting (waiting) and Terminated (terminated).

2. Thread Creation Method

The Java language provides two thread creation methods, one is to inherit the Thread class, and the other is to implement the Runnable interface.

1. Inherit the Thread class

public class MyThread extends Thread{

@Override
public void run(){
    //执行线程任务
}

}

2. Implement the Runnable interface

public class MyRunnable implements Runnable{

@Override
public void run(){
    //执行线程任务
}

}

3. How to use threads

Threads are one of the important features of the Java language. By using multi-threads, you can give full play to computer multi-core processing. performance of the processor and improve program efficiency. Below we will introduce some common uses of Java threads.

1. Start a thread

MyThread thread1 = new MyThread();
thread1.start();

MyRunnable runnable = new MyRunnable();
Thread thread2 = new Thread(runnable);
thread2.start();

2. Thread priority

The thread priority in Java is represented by an integer, and the range is 1 to 10, default priority is 5. We can control the number of thread executions by setting the thread's priority. Threads with higher priorities will get more CPU running time.

thread1.setPriority(Thread.MAX_PRIORITY);//Set the highest priority

3. Thread sleep

The thread sleep mode can suspend the current thread for a period of time. Some unnecessary CPU usage can be avoided. We can implement thread sleep through the Thread.sleep method.

try{

Thread.sleep(1000);//睡眠1秒

}catch(InterruptedException e){

e.printStackTrace();

}

4. Thread joining

Joining a thread is Refers to letting the current thread wait for another thread to finish executing before continuing. In Java, we can join threads through the Thread.join method.

thread1.join();//Waiting for thread 1 to complete execution

5. Thread synchronization

In Java multi-thread programming, thread synchronization is very important , mainly to avoid conflicts between threads and ensure thread safety. In Java, we can use the synchronized keyword to achieve thread synchronization.

public synchronized void method(){

//同步代码块

}

6. Thread interruption

Thread interruption in Java is implemented through the interrupt method. When a thread is interrupted, an InterruptedException will be thrown, which we can handle in the catch block.

try{

Thread.sleep(1000);

}catch(InterruptedException e){

//线程被中断，进行处理

}

7. Thread pool

Thread pool is Java A commonly used thread management method in China, it can avoid the performance overhead of frequent thread creation and destruction and improve the running efficiency of the program. In Java, we can create thread pools through the Executors class. Thread pools usually include four types: FixedThreadPool, CachedThreadPool, ScheduledThreadPool and SingleThreadExecutor.

ExecutorService executor = Executors.newFixedThreadPool(10);

4. Summary

This article introduces the creation and use of Java language threads, including the basic concepts of threads, threads How to create, how to use threads, etc. In Java development, the use of threads is very common, which can improve the concurrency and responsiveness of the program, but thread management is also very important, and thread safety and optimization need to be paid attention to. I hope this article can help everyone better understand the use of Java threads.

The above is the detailed content of How to create and use Java language threads. For more information, please follow other related articles on the PHP Chinese website!