To understand the code, the user needs to know the basics of Java threads and anonymous inner classes.
The code defines a class A that extends Thread and overrides its run() method to print the values of i from 0 to 1. It also defines a class Test with a main() method that creates an instance of Test and calls its check() method with an anonymous inner class that extends A. The check() method calls the start() method on the A instance, which starts a new thread that executes the run() method.
Now let's go through each option and explain why it is true or false:
A. 0 0: This option is false. The code creates a new thread that executes the run() method of the A instance, which prints the values of i from 0 to 1. Since the start() method is called only once, the output will be either "0 1" or "1 0", depending on which thread runs first.
B. Compilation error, class A has no start method: This option is false. The A class extends Thread, which provides the start() method. Thus, there is no compilation error.
C. 0 1: This option is true. The code creates a new thread that executes the run() method of the A instance, which prints the values of i from 0 to 1. Since the start() method is called only once, the output will be either "0 1" or "1 0", depending on which thread runs first.
D. Compilation succeed but runtime exception: This option is false. There is no runtime exception in the code.
Therefore, the correct answer is:
The Answer is: C. 0 1
