Explain Which of these statement is incorrect?

Question

Which of these statement is incorrect? (a) A thread can be formed by implementing Runnable interface only (b) A thread can be formed by a class that extends Thread class (c) start() method is used to begin execution of the thread (d) run() method is used to begin execution of a thread before start() method in special cases This question was posed to me in an online quiz. The doubt is from Implementing Runnable interface for Threads in section Multithreading of Java Select the correct answer from above options

Answer 1

Correct choice is (d) run() method is used to begin execution of a thread before start() method in special cases To explain: run() method is used to define the code that constitutes the new thread, it contains the code to be executed. start() method is used to begin execution of the thread that is execution of run(). run() itself is never used for starting execution of the thread.