HelloWorld Program – I
Q.1: What is the valid extension of a Java program ?
A. .Java
B. .JAVA
C. .JJ
D. None of these
Q.2: Identify the correct statement.
A. Java program file extension is case sensitive.
B. Java program file extension is case sensitive only on Mac OS.
C. Java program file extension is not case sensitive.
D. None of these
Answer : A
Q.3: What will happen if a Java program by name of ” prg.ca” is compiled?
A. Compiler error
B. No compiler error
C. Runtime error
D. None of the above
Answer : A
Q.4: How to give single line comment ?
A. //
B. #
C. ” ”
D. /
Answer : A
Q.5: How to give multi-line comment ?
A. //
B. #
C. /* …*/
D. ” ”
Answer : C
Q.6: What will happen if a Java program by name of ” Prg. java” is compiled ?
A. Runtime error
B. Compiler error
C. Data error
D. None of the above
Answer : B
Q.7: My Prg.java will compile to …………… file.
A. MyPrg.class
B. MyPrg.bytecode
C. MyPrg
D. MyPrg.java
Answer : A
Q.8: Binary Java code is also called as ………….
A. Source code
B. Byte code
C. Runtime code
D. Native code
Answer : B
Q.9: What will happen if a Java program by name “Prg.java” is compiled?
A. Compiler error
B. Runtime error
C. No Compiler error
D. Data error
Answer : C
Q.10: …………. Method is the entry point in Java program.
A. MAIN()
B. Main()
C. main()
D. None of the above
Answer : C
Q.11: What is the output ?
class Program {
public static void main(String a){
system.out.println(“HelloWorld”);
}
}
A. Runtime error
B. Compiler error
C. HelloWorld
D. No output
Answer : A
Q.12: Which of the following is the valid entry point in a java program ?
A. public static void main(String …a)
B. public static void Main(String…a)
C. public static void main()
D. public static void Main()
Answer : A
Q.13: What is the output ?
class Program {
public static void main(String[]a){
System.out.println(“HelloWorld”);
}
}
A. Runtime error
B. HelloWorld
C. Compiler error
D. No output
Answer : B
Q.14: What is the output if the command line arguments are : Ram Hari ?
class Program {
public static void main(String args[]) {
system.out.println(” HelloWorld”+args[0]+”,”+args[1]);
}
}
A. HelloWorld
B. HelloWorld Ram, Hari
C. Runtime error
D. None of the above
Answer : B
Q.15: What is the output(when no command line arguments are passed)?
class Program {
public static void main(String args[]) {
system.out.println(” Namaskar :”+args);
}
}
A. Compiler error
B. Runtime error
C. Namaskar :
D. Namaskar :[Ljava.lang.String;@2a139a55
Answer : D
Q.16: What is the output ?
class Program {
public static void main(String ….a) {
system.out.println(” HelloWorld”);
}
}
A. Compiler error
B. Runtime error
C. No output
D. Helloworld
Answer : D
Q.17: Identify the correct signature of “main” method which acts as an entry point.
A. public static void main (String args[])
B. public static void Main (String args[])
C. public static void main ()
D. public static void Main ()
Answer: A
Q.18: What is the output if the command line arguments is : Ram ?
class Program {
public static void main(String args[]) {
system.out.println(” HelloWorld”+args[0]+”,”+args[1]);
}
}
A. HelloWorld Ram
B. HelloWorld
C. Compiler error
D. Runtime error
Answer : D
Q.19: System class belongs to ………….. package.
A. java.lang
B. java.io
C. java.basic
D. java.System
Answer : A
Q.20: What is the output ?
class Program {
public static void main(String args[]) {
system.out.println(” HelloWorld”);
}
}
A. Compiler error
B. Runtime error
C. HelloWorld
D. No error
Answer : B
Q.21: Which of the following is the valid entry point in a java program?
A. public static void Main (String args[])
B. public static void main (String args[])
C. public static void main (String[] args)
D. Both B and C
Answer: D
Q.22: What is the output ?
class Program {
public static void main(String args[]) {
system.out.println(” HelloWorld”);
}
public static void Main(String args[]) {
system.out.println(” HelloWorld”);
}
}
A. No output
B. HelloWorld
C. Compiler error
D. Runtime error
Answer : B
Q.23: What is the output ?
class Program {
public static void main(String args[]) {
system.out.println(” HelloWorld”);
}
public static void main(String args[]) {
system.out.println(” HelloWorld”);
}
}
A. Runtime error
B. Compiler error
C. No output
D. HelloWorld
Answer : B
Q.24: “System.out” is an object of ………. class.
A. Print
B. PrintStream
C. PrintWriter
D. Printer
Answer : B
Q.25: What is the output if the command line arguments are : 10 20 ?
class Program {
public static void main(String args[]) {
int i = Integer.parseInt(args[0]);
int j = Integer.ParseInt(args[1]);
system.out.println(i+j);
}
}
A. 30
B. Compiler error
C. Runtime error
D. 10
Answer : A
Q.26: What is the output if the command line arguments are : A B ?
class Program {
public static void main(String args[]) {
int i = Integer.parseInt(args[0]);
int j = Integer.ParseInt(args[1]);
system.out.println(“The sum is :”+(i+j));
}
}
A. Runtime error
B. Compiler error
C. 131
D. 132
Answer : A
