Mcqs on Java - Activity hour

_____ is used to find and fix bugs in the Java programs

• JVM

• JRE

• JDK

• JDB

Which of the following is a valid declaration of a char?

• char ch = '\utea';

• char ca = 'tea';

• char cr = \u0223;

• char cc = '\itea';

What does the expression float a = 35 / 0 return?

• 0

• Not a number

• Infinity

• Run time exception

Evaluate the following Java expression, if x=3, y=5, and z=10:

++z + y - y + z + x++

• 24

• 23

• 20

• 25

What will be the output of the following program?

public class Test { public static void main(String[] args) { int count = 1; while (count <= 15) { System.out.println(count % 2 == 1 ? "***" : "+++++"); ++count; } // end while } // end main }

• 15 times ***

• 15 times +++++

• 8 times *** and 7 times +++++

• Both will print only once

Which of the following for loop declaration is not valid?

• for ( int i = 99; i >= 0; i / 9 )

• for ( int i = 7; i <= 77; i += 7 )

• for ( int i = 20; i >= 2; - -i )

• for ( int i = 2; i <= 20; i = 2* i )

Which one of the following is correct?

• Java applets can not be written in any programming language

• An applet is not a small program

• An applet can be run on its own

• Applets are embedded in another applications

Which of the following is/are true about packages in Java?

1) Every class is part of some package.

2) All classes in a file are part of the same package.

3) If no package is specified, the classes in the file

go into a special unnamed package

4) If no package is specified, a new package is created with

folder name of class and the class is put in this package.

• Only 1, 2 and 3

• Only 1, 2 and 4

• Only 4

• Only 1 and 3

Predict the output of following Java Program

class Test { public static void main(String args[]) { int x = -4; System.out.println(x>>1); int y = 4; System.out.println(y>>1); } }

• Compiler Error: Operator >> cannot be applied to negative numbers

• -2

  2

• 2

  2

• 0

  2

What is the output of the following program?

class Helper

{ private int data; private Helper()

{ data = 5;

}

}

public class Test

{ public static void main(String[] args)

{

Helper help = new Helper(); System.out.println(help.data);

}

}

• Compilation error

• 5

• Runtime error

• None