CODEWITHSUNDEEP
java
Aslam a
Aslam a

Reputation: 759

Threads run method

Can we use directly run method as done in the below class. It is producing the same result as that when we use t1.start();. Is there any reason behind using only start method for invoking run?

public class runcheck extends Thread{

    public void run(){

        System.out.println(" i am run");

    }
    public static void main(String args[]){

        runcheck as = new runcheck();
        Thread t1 = new Thread(as);
        t1.run();

    }

}

Upvotes: 3

Views: 107

Answers (3)

boxed__l
boxed__l

Reputation: 1336

From this:

start() calls run() asynchronously (non-blocking)

while calling run() directly results in synchronous calling (blocking)

Upvotes: 1

Sajan Chandran
Sajan Chandran

Reputation: 11487

Yes, you can invoked run directly from main method, in this case the main method and run method runs one after the other.

Order

main -> t.run() -> main - Only 1 Thread

But if you call start method on the instance t1, then the run method and the main method runs parallely.

main -> t.start() -> main - 1st Thread

run() - 2nd Thread.

Upvotes: 0

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 279930

Yes, but it will run in the same thread. It's equivalent to calling a method on a normal object.

start() is what you want. It calls a native method that actually spawns an OS Thread to execute the run() code in.

Upvotes: 8

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