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When to call the Thread.run() instead of Thread.start() in Java?
When we call the start() method on a thread it causes the thread to begin execution and run() method of a thread is called by the Java Virtual Machine(JVM).
If we call directly the run() method, it will be treated as a normal overridden method of a thread class (or runnable interface) and it will be executed within the context of the current thread, not in a new thread.
Example
public class CallRunMethodTest extends Thread { @Override public void run() { System.out.println("In the run() method: " + Thread.currentThread().getName()); for(int i = 0; i < 5 ; i++) { System.out.println("i: " + i); try { Thread.sleep(300); } catch (InterruptedException ie) { ie.printStackTrace(); } } } public static void main(String[] args) { CallRunMethodTest t1 = new CallRunMethodTest(); CallRunMethodTest t2 = new CallRunMethodTest(); t1.run(); // calling run() method directly instead of start() method t2.run(); // calling run() method directly instead of start() method } }
In the above example, two threads are created and the run() method is called directly on the threads rather than calling a start() method.
Output
In the run() method: main i: 0 i: 1 i: 2 i: 3 i: 4 In the run() method: main i: 0 i: 1 i: 2 i: 3 i: 4
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