Difference between Thread.start() and Thread.run() in Java
In Java's multi-threading concept, start() and run() are the two most important methods. So what's the difference between them? The following article will introduce you to the start() and run() methods and introduce the differences between them. I hope it will be helpful to you.
The start() method in Java
The start() method of the thread class can be used Start a thread; this method internally calls the run() method of the Runnable interface to execute the code specified in the run() method in a separate thread. [Video tutorial recommendation: Java tutorial]
The start() method starts the thread to perform the following tasks:
● It counts a new thread
● The thread moves from New State to Runnable state.
● When a thread has a chance to execute, its target run() method will run.
The run() method in Java
The run() method of the thread class is an abstract method of the Runnable interface, controlled by the java virtual machine If called directly, no new thread will be created.
The difference between start() method and run() method
1. Definition of method
# The ##start() method is defined in the java.lang.Thread class; and the run() method is defined in the java.lang.Runnable interface and must be rewritten in the implementation class.2. New thread creation
When the program calls the start() method, a new thread will be created and then the run() method will be executed. But if we call the run() method directly, no new thread will be created, the run() method will be executed as a regular method call of the current calling thread itself, and no multi-threading will occur. Example:class MyThread extends Thread {
public void run()
{
System.out.println("\n");
System.out.println("当前线程的名称: "
+ Thread.currentThread().getName());
System.out.println("run()方法调用");
}
}
class demo {
public static void main(String[] args)
{
MyThread t = new MyThread();
t.start();
}
}Output:
class MyThread extends Thread {
public void run()
{
System.out.println("\n");
System.out.println("当前线程的名称: "
+ Thread.currentThread().getName());
System.out.println("run()方法调用");
}
}
class GeeksforGeeks {
public static void main(String[] args)
{
MyThread t = new MyThread();
t.run();
}
}Output:
3. Multiple calls
The start() method cannot be called multiple times, otherwise a java.lang.IllegalStateException will be thrown; however, the run() method can be called multiple times. call because it's just a normal method call. The above is the entire content of this article, I hope it will be helpful to everyone's study. For more exciting content, you can pay attention to the relevant tutorial columns of the PHP Chinese website! ! !The above is the detailed content of Difference between Thread.start() and Thread.run() in Java. For more information, please follow other related articles on the PHP Chinese website!
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