OOP - Java Classes

Which one of the following is a valid statement?

• char[] c = new char();

• char[] c = new char[5];

• char[] c = new char(4);

• char[] c = new char[];

Which is the correct way of knowing Array Size in Java?

• int[] ary;

  ary.length()

• int[] ary;

  ary.length

• int[] ary;

  ary->length()

• int[] ary;

  ary->length

A ___________ is a pre-defined set of steps that complete a specific task, optionally based on parameter values, and optionally returning some result.

• array

• function

• method

• module

• class

Predict the output of the following program.

class A{

int a=40;//non static

public static void main(String args[]){

System.out.println(a);

}

}

• Compilation Error

• 40

• 0

• None of the above

what is the output of this question?

class Test1 {

public

static void main(String[] args)

{

int x = 20;

System.out.println(x);

}

static

{

int x = 10;

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

}

}

• 10 20

• 20 10

• 10 10

• 20 20

Which of the following variable is declared as static?

• Home address of a particular Student

• Account number of a Customer

• Company name of all Employees in an Organization

• Name of a Employee

What is the output of the following code?

public class Demo

{

public void show(int a)

{

System.out.println(a);

}

public static void main(String[] args)

{

show(20);

}

}

• 20

• No Output Displayed

• a constant is passed as argument

• Compile Time Error

Output of following Java Program?

• 10

• 20

• Compilation Error

• Run Time Error

Output of following Java Program?

• 12

• 321

• 123

• 23

What is subclass in java?

• A subclass is a class that extends another class

• A subclass is a class declared inside a class

• Both above.

• None of the above.