# Start Thread Execution

**1) start():**

Calling start() on a Thread instance creates a new thread of execution, which exe- cutes run(). **You can call start() on a thread that’s in the NEW state**. Calling start() from any other thread state will throw an IllegalThreadStateException:

![](/files/-LTxDGugh3XwN4R6o9w8)

![](/files/-LTxDJONGBF4hQvIGor_)

![](/files/-LTxDlRMCyBqK-ryi1cy)

Calling run() on a Thread instance doesn’t start a new thread of execution. The run() continues to execute in the same thread.

#### Problem:

![](/files/-LTxGRlTXldpAAhwMbo5)

![](/files/-LTxGdx_04KnEp8pFMsK)

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