Interview Questions of Java-First-Program

Q1. What is the meaning of 'public static void main(String[] args)' in Java ?
Solution:
Explanation:

public - Access Modifier
static - Reserved Keyword
void - No value is returned after execution
main - The program start running for compiling
String[] args - Allows command-line input when executing the program.

Q2. What are the steps to compile and run a Java program ?
Solution:

Step - 01 Write the Java program in a .Java file (Ex- Helloworld.java).
Step - 02 Compile the program using command prompt by giving instruction.

javac Helloworld.java

Step - 03 Run the program using.

java Helloworld

Output will display.

Q3. What is the purpose of 'System.out.println()' in Java?

Solution:

System.out.println() is used to print messages to the console.
It is a built-in Java method from the System class.

Ex- System.out.println("Hello world!")
Hello world! in the output will printed.

Q1. What is the meaning of 'public static void main(String[] args)' in Java ?
Solution:
Explanation:

public - Access Modifier
static - Reserved Keyword
void - No value is returned after execution
main - The program start running for compiling
String[] args - Allows command-line input when executing the program.

javac Helloworld.java

Step - 03 Run the program using.

java Helloworld

Output will display.

Q3. What is the purpose of 'System.out.println()' in Java?

Solution:

System.out.println() is used to print messages to the console.
It is a built-in Java method from the System class.

Ex- System.out.println("Hello world!")
Hello world! in the output will printed.