QUIZ-5 static, String and StringBuffer

The keyword "static" in Java is used with

• Method

• Block

• Variable

• All the Above

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 snippet?

public class Demo

{

public static void main(String[] args)

{

System.out.println("Done ");

}

static

{

System.out.print("Hi ");

}

static

{

System.out.print("Well ");

}

}

• Done Hi Well

• Hi Well Done

• Well Done Hi

• Done Well Hi

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

Which of the following is not a correct statement?

• A class can have any number of static blocks

• Static method is accessed directly using class name

• Separate memory is allocated for each object for all static variables

• Static method is executed before main() method once a class is loaded

Static variables belongs to an Object?

• Yes

• No

What is the output of the following code?

public class Demo

{

static int x=10;

int y =15;

public Demo()

{

x++;

y++;

}

public static void main(String[] args)

{

Demo d1= new Demo();

Demo d2= new Demo();

Demo d3= new Demo();

System.out.println(d3.x + " , " +d3.y);

}

}

• 13,15

• 13,16

• 13,18

• 10, 18

What is the output of the code segment?

public class Demo

{

static int a = 20;

public static void main(String args[])

{

add();

System.out.print(a);

}

private static void add()

{

a = a++ + 20;

}

}

• 40

• 41

• 20

• 21

Which of the following is Mutable object

• String

• StringBuffer

The method of String class used to obtain index of the first occurrence of a specified string or character.

• charAt()

• getString()

• substring()

• indexOf()