Classes and Objects | Accenture TFA

 

Question 1

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Question text

___ and _____ are the access specifiers that can be applied to top level Class.

Select one or more:

public 

protected

default 

private

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Your answer is correct.

The correct answers are: default, public

Question 2

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class Sample{  

   private double num = 100;

   private int square(int a){

return a*a;

   }

}  

public class Test{

   public static void main(String args[]){  

Sample obj = new Sample();  

System.out.println(obj.num); 

System.out.println(obj.square(10));

   }  

}

Select one:

Compile time error 

Run time error

Executes but no output

100

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Your answer is correct.

The correct answer is: Compile time error

Question 3

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Choose the appropriate access specifier for the attribute value so that it can be accessed from anywhere.

class Test

{

Choose...privateprotectedpublicdefault  int value;

}

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Your answer is correct.

The correct answer is:

Choose the appropriate access specifier for the attribute value so that it can be accessed from anywhere.

class Test

{

[public] int value;

}

Question 4

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Choose the appropriate return type for the getters and setters provided below. 

class Test

{

private int value;

public  voidint  setValue(int value){//some code}

public  voidint  getValue(){//some code}

}

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Your answer is correct.

The correct answer is:

Choose the appropriate return type for the getters and setters provided below. 

class Test

{

private int value;

public [void] setValue(int value){//some code}

public [int] getValue(){//some code}

}

Question 5

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Analyze the below program, and fill the correct code so that it produces the below output:

0
0.0
101

public class Book {
	private int bookId;
	private double bookPrice;
	public int getBookId() {
		return bookId;
	}
	public void setBookId(int bookId) {
		this.bookId = bookId;
	}
	public double getBookPrice() {
		return bookPrice;
	}
	public void setBookPrice(double bookPrice) {
		this.bookPrice = bookPrice;
	}
	
}

class Test
{
	public static void main(String a[])
	{
		Book bobj=new Book();
		 blank 
		 blank 
		 blank 
		 blank 
		
	}
}

  

bobj.setBookId(101);bobj.setBookId(101);bobj.setBookId(101);bobj.setBookId(101);System.out.println(bobj.getBookPrice());System.out.println(bobj.getBookPrice());System.out.println(bobj.getBookPrice());System.out.println(bobj.getBookPrice());System.out.println(bobj.getBookId());System.out.println(bobj.getBookId());System.out.println(bobj.getBookId());System.out.println(bobj.getBookId());

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Your answer is correct.
Once we create an object, the default value will be assigned for each attribute. First print the values, then set the values and again print the values.

The correct answer is: Analyze the below program, and fill the correct code so that it produces the below output:

0
0.0
101

public class Book {
	private int bookId;
	private double bookPrice;
	public int getBookId() {
		return bookId;
	}
	public void setBookId(int bookId) {
		this.bookId = bookId;
	}
	public double getBookPrice() {
		return bookPrice;
	}
	public void setBookPrice(double bookPrice) {
		this.bookPrice = bookPrice;
	}
	
}

class Test
{
	public static void main(String a[])
	{
		Book bobj=new Book();
		[System.out.println(bobj.getBookId());]
		[System.out.println(bobj.getBookPrice());]
		[bobj.setBookId(101);]
		[System.out.println(bobj.getBookId());]
		
	}
}

Question 6

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Consider the below code snippet  and determine the output.

class Student

{ private int studentId;

private float average;

}

class Test

{

public static void main(String a[])

{

Student s=new Student();

s.studentId=123;

System.out.println(s.studentId);

}

}

Select one:

Compile time error 

1

Any value

0

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Your answer is correct.
Private variables can be accessed only within the class. They cannot be accessed outside the class.

The correct answer is: Compile time error

Question 7

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The below code snippet shows an error

cannot find symbol:

System.out.println("BookId:"+bobj.getId());

public class Book {

private int bookId;

private double bookPrice;

public int getBookId() {

return bookId;

}

public void setBookId(int bookId) {

this.bookId = bookId;

}

public double getBookPrice() {

return bookPrice;

}

public void setBookPrice(double bookPrice) {

this.bookPrice = bookPrice;

}

}

public class Test {

public static void main(String[] args) {

Book bobj=new Book();

bobj.setBookId(123);

bobj.setBookPrice(500);

System.out.println("BookId:"+bobj.getId());

System.out.println("BookPrice:"+bobj.getBookPrice());

}

}

Analyze the above code and select the correct reason for the error.

Select one:

bobj is not initialized

getId method is not present in the book class 

“+” symbol should not be used in  System.out.println

Getter method should not be called inside System.out.println

Feedback

Your answer is correct.

When we specify the methodname or variablename or classname wrongly,then we will get an error “cannot find symbol”. The compiler tries to fetch the methodname "getId" from the book class, where it is not defined.

The correct answer is: getId method is not present in the book class

Question 8

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Question text

Arrange the code in the correct sequence, so that the program compiles successfully.

• public class Employee {
  private int employeId;
  private float salary;
• public void setSalary(float salary1) {
• if(salary>0){
  salary=salary1;
  }
• }
  }

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Your answer is correct.
The purpose of the setter method is to set a valid value for the attribute, by  doing the necessary validations