Java Basics

Java Source Code is compiled into

• .Obj

• Source Code

• Bytecode

• .Exe

Single line comment starts with _________ in Java.

• /**

• //

• /*

• None of these

Java is case sensitive?

• True

• False

• Depends On Complier

• May be true or false

How to compile java code in command prompt?

• javac filename.java

• java filename.java

• javac filename

• java filename

What is true in Java?

• For all class names the first letter should be in Upper Case.

• All method names should start with a Lower Case letter.

• Name of the program file should exactly match the class name.

• All of the above

All Java components require names. Names used for classes, variables, and methods are called?

• Variables

• identifiers

• Access Modifiers

• Java Modifiers

What is JRE?

• JRE is a java based GUI application.

• JRE is an implementation of the Java Virtual Machine which executes Java programs.

• JRE is an application development framework.

• None of the above

Default, public , protected, private are?

• Access Modifier

• Non-access Modifiers

• Both A and B

• It's variable

What will be the output of the program?class PassA

{

public static void main(String [] args)

{

PassA p = new PassA();

p.start();

}

void start()

{

long [] a1 = {3,4,5};

long [] a2 = fix(a1);

System.out.print(a1[0] + a1[1] + a1[2] + " ");

System.out.println(a2[0] + a2[1] + a2[2]);

}

long [] fix(long [] a3)

{

a3[1] = 7;

return a3;

}

}

• 12 15

• 15 15

• 3 4 5 3 7 5

• 3 7 5 3 7 5

What will be the output of the program?

class PassS

{

public static void main(String [] args)

{

PassS p = new PassS();

p.start();

}

void start()

{

String s1 = "slip";

String s2 = fix(s1);

System.out.println(s1 + " " + s2);

}

String fix(String s1)

{

s1 = s1 + "stream";

System.out.print(s1 + " ");

return "stream";

}

}

• slip stream

• slipstream stream

• stream slip stream

• slipstream slip stream