Java Quiz-1

What is the output of this program?

class evaluate

{

public static void main(String args[])

{

int a[] = {1,2,3,4,5};

int d[] = a;

int sum = 0;

for (int j = 0; j < 3; ++j)

sum += (a[j] * d[j + 1]) + (a[j + 1] * d[j]);

System.out.println(sum);

}

}

• 38

• 39

• 40

• 41

What is the output of this program?

class variable_scope

{

public static void main(String args[])

{

int x;

x = 5;

{

int y = 6;

System.out.print(x + " " + y);

}

System.out.println(x + " " + y);

}

}

• 5 6 5 6

• 5 6 5

• Runtime error

• Compilation error

When does method overloading is determined?

• At run time

• At compile time

• At coding time

• At execution time

What is it called if an object has its own lifecycle and there is no owner?

• Aggregation

• Composition

• Encapsulation

• Association

What is it called where child object gets killed if parent object is killed?

• Aggregation

• Composition

• Encapsulation

• Association

Which of the following is a valid declaration of an object of class Box?

• Box obj = new Box();

• Box obj = new Box;

• obj = new Box();

• new Box obj

What is the output of this program?

class main_class

{

public static void main(String args[])

{

int x = 9;

if (x == 9)

{

int x = 8;

System.out.println(x);

}

}

}

• 9

• 8

• Compilation error

• Runtime error

What is the output of this program?

class box

{

int width;

int height;

int length;

}

class mainclass

{

public static void main(String args[])

{

box obj1 = new box();

box obj2 = new box();

obj1.height = 1;

obj1.length = 2;

obj1.width = 1;

obj2 = obj1;

System.out.println(obj2.height);

}

}

• 1

• 2

• Runtime error

• Garbage value

What is the output of this program?

class box

{

int width;

int height;

int length;

}

class mainclass

{

public static void main(String args[])

{

box obj = new box();

System.out.println(obj);

}

}

• 0

• 1

• Runtime error

• classname@hashcode in hexadecimal form

Which of this statement is incorrect?

• All object of a class are allotted memory for the all the variables defined in the class

• If a function is defined public it can be accessed by object of other class by inheritation

• main() method must be made public

• All object of a class are allotted memory for the methods defined in the class