How to create Thread in Java Programming | A2IT JAVA
Java Threads | How to create a thread in Java
There are two ways to create a thread:
By extending Thread class
By implementing Runnable interface.
Thread class:
Thread class provide constructors and methods to create and perform operations on a thread.Thread class extends Object class and implements Runnable interface.
Commonly used Constructors of Thread class:
Thread()
Thread(String name)
Thread(Runnable r)
Thread(Runnable r,String name)
Commonly used methods of Thread class:
public void run(): is used to perform action for a thread.
public void start(): starts the execution of the thread.JVM calls the run() method on the thread.
public void sleep(long miliseconds): Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds.
public void join(): waits for a thread to die.
public void join(long miliseconds): waits for a thread to die for the specified miliseconds.
public int getPriority(): returns the priority of the thread.
public int setPriority(int priority): changes the priority of the thread.
public String getName(): returns the name of the thread.
public void setName(String name): changes the name of the thread.
public Thread currentThread(): returns the reference of currently executing thread.
public int getId(): returns the id of the thread.
public Thread.State getState(): returns the state of the thread.
public boolean isAlive(): tests if the thread is alive.
public void yield(): causes the currently executing thread object to temporarily pause and allow other threads to execute.
public void suspend(): is used to suspend the thread(depricated).
public void resume(): is used to resume the suspended thread(depricated).
public void stop(): is used to stop the thread(depricated).
public boolean isDaemon(): tests if the thread is a daemon thread.
public void setDaemon(boolean b): marks the thread as daemon or user thread.
public void interrupt(): interrupts the thread.
public boolean isInterrupted(): tests if the thread has been interrupted.
public static boolean interrupted(): tests if the current thread has been interrupted.
Runnable interface:
The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. Runnable interface have only one method named run().
public void run(): is used to perform action for a thread.
Starting a thread:
The start() method of Thread class is used to start a newly created thread. It performs the following tasks:
A new thread starts(with new callstack).
The thread moves from New state to the Runnable state.
When the thread gets a chance to execute, its target run() method will run.
1) Java Thread Example by extending Thread class
FileName: Multi.java
class Multi extends Thread{
public void run(){
System.out.println("thread is running...");
}
public static void main(String args[]){
Multi t1=new Multi();
t1.start();
}
}
How do you create a thread in Java?
You can create threads by implementing the runnable interface and overriding the run() method. Then, you can create a thread object and call the start() method. Thread Class: The Thread class provides constructors and methods for creating and operating on threads.
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