CSL203 OOP Lab (Cycle-1) Viva

Which one the following represents the file type in which bytecode is stored?

• .java

• .txt

• .class

• .pdf

In java, the 'int' data type is ____ bits in size

• 8

• 16

• 32

• 64

Which one of the following packages is available by default in all java programs?

• java.util

• java.io

• java.lang

• java.awt

Which of the following is not a valid java identifier?

• myVariable

• my_Variable

• 2ndVariable

• _myVariable

In the JVM, what is the purpose of Just-In-Time (JIT) compiler?

• To compile java source code into bytecode

• To convert bytecode into machine code at runtime for improved performance

• To perform static analysis on bytecode

• To mange memory allocation

What is the main advantage of Java's automatic garbage collection?

• It speeds up program execution

• It automatically reclaims memory used by objects that are no longer referenced

• It reduces the need for explicit exception handling

• It compiles code faster

Who is considered the primary creator of the java programming language?

• James Gosling

• Bjarne Stroustrup

• Dennis Ritchie

• Guido van rossum

What is the output of the following code, int a=10; int b=20; System.out.println(a+b+"hello");

• 1020hello

• 10 20 hello

• 30hello

• hello30

Which one of the following loop type will always execute at least once?

• for

• while

• do-while

• None of these

What will be output of the following code, String s="welcome"; String t=s; System.out.println(s==t)

• true

• false

• compilation error

• null