Is it unsafe to call methods from a thread?

Why can't i call Start() method twice on same thread object?

• example code: public class MyThread extends Thread{ public void run(){ System.out.println("hi"); } } Thread mythread=new MyThread(); mythread.start(); mythread.start();// Exception why? Also Explain me What happens on calling Start() method? Note:don't say me it calls the run() method i know it Explain me Somewhat more Special things means internals details.  Thanks!

• Answer:

  Solution- use a different object Eg- mythread.start() mythread2.start() Internal procssing- Calling start places the virtual CPU embodied in the thread into a runnable state, meaning it bcmz viable fr scheduling for execution by the JVM. In other words, by calling the start() you hav told the JVM to schedule your thread in the runnable threads queue. The nxt step automatically is to execute or run mythread. (Y do u want to re-request to place ur thread in the runnable state when the first call already does this for u. It is neither of a fruitful consequence nor semantically correct (poor compiler has to giv n error)) This request is generated by run(). (v say this as -the thread is in started state)Then when the thread reaches the start of the queue it starts running actually.