JAVA - Day1

What is the main purpose of the main() method in Java?

• It is the entry point of the Java program.

• It is used to define class properties.

• It is only required for GUI-based applications.

• It is used to define multiple threads.

Which of the following is true about Java?

• Java is a compiled language only.

• Java is a scripting language.

• Java is both compiled and interpreted.

• Java does not require a JVM to run.

What is the default value of an uninitialized int variable in Java?

• 0

• null

• Garbage value

• 1

What will be the output of the following Java code?
int x = 10;

if (x > 10)

System.out.println("Greater");

else

System.out.println("Not Greater");

• Greater

• Not Greater

• Compilation Error

• Runtime Error

How many times will the following loop execute?
int i = 0;

while (i < 3) {

System.out.println(i);

i++;

}

• 0

• 3

• Infinite

• 4

What does the javac command do?

• Executes Java programs

• Compiles Java source files

• Runs Java bytecode

• Starts the JVM

Which component is responsible for executing Java bytecode?

• JDK

• JRE

• JVM

• Compiler

What is the extension of compiled Java files?

• .java

• .class

• .exe

• .jar

Which of the following is not a primitive data type in Java?

• boolean

• char

• String

• double

What is the size of a long data type in Java?

• 2 bytes

• 4 bytes

• 8 bytes

• 16 bytes