Quiz#2: Java

What will be the output of the following Java code?

• 32

• 33

• 24

• 25

Which environment variable is used to set the Java path?

• MAVEN_Path

• JavaPATH

• JAVA

• JAVA_HOME

Which method must be implemented by a class that implements the Runnable interface?

• run( )

• start( )

• main( )

• execute( )

What does the hashCode( ) method in Java return?

• The memory address of the object

• The size of the object

• An integer representation of the object

• A string representation of the object

What is the role of the `@FunctionalInterface` annotation in Java?

• It allows a class to be used in lambda expressions.

• It enforces that the interface has exactly one abstract method.

• It makes the interface eligible for serialization.

• It automatically generates default methods for the interface.

What does the `ForkJoinPool` class in Java do?

• It provides a thread pool optimized for divide-and-conquer algorithms.

• It allows concurrent access to a shared resource.

• It synchronizes multiple threads.

• It blocks threads until they are explicitly woken up.

Which of these packages contains the exception Stack Overflow in Java?

• java.io

• java.system

• java.lang

• java.util

Which of these statements is incorrect about Thread?

• start( ) method is used to begin execution of the thread

• run( ) method is used to begin execution of a thread before start( ) method in special cases

• A thread can be formed by implementing Runnable interface only

• A thread can be formed by a class that extends Thread class

Which of this method can be used to make the main thread to be executed last among all the threads?

• stop( )

• sleep( )

• join( )

• call( )

What will be the output of the following Java program?

Note: inputoutput.java is stored in the disk.

• true

• false

• prints number of bytes in file

• prints number of characters in the file