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Encapsulation is a cornerstone of object-oriented programming (OOP) in Java. It promotes data protection and code organization by bundling data (attributes) and methods (functions) that operate on that data into a single unit called a class. By controlling access to this data, encapsulation safeguards the integrity of your program and ensures proper data manipulation.
This quiz serves as a valuable tool to test your understanding of encapsulation concepts in Java. Take the short quiz to assess your knowledge and identify areas for potential improvement.
Whether you’re a beginner or an experienced Java developer, this quiz provides an opportunity to solidify your grasp of this fundamental OOP principle. Let’s test your knowledge.
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Question 1 of 15
1. Question
- Which method is used for grouping the code and data together ?
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Question 2 of 15
2. Question
class Demo {
private int number ;
number = 5;
public void display() {
System.out.println(number);
}
}
class Main {
public static void main ( String args [ ] )
{
Demo d = new Demo();
d.display();
}
}
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Question 3 of 15
3. Question
class Sample {
protected String a = “DataFlair”;
}
class Example extends Sample {
public void print() {
System.out.println(a);
}
}
class Main {
public static void main ( String args [ ] )
{
Example e = new Example();
e.print();
}
}
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Question 4 of 15
4. Question
Which two concepts are used to encapsulate a class ?
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Question 5 of 15
5. Question
class EncapsulationDemo {
private String name;
public void getname() {
return name;
}
public void setname(string text) {
name = text;
System.out.println(name);
}
}
class Main {
public static void main ( String args [ ] )
{
EncapsulationDemo d = new EncapsulationDemo();
d.getname();
d.setname(“DataFlair”);
}
}
CorrectIncorrect -
Question 6 of 15
6. Question
class Encapsulation {
private int branches;
private string company;
public void GetBranches() {
return branches;
}
public void SetBranches()
System.out.println(branches);
}
public void GetCompany () {
return company;
}
public void SetName( String name ) {
company = name;
System.out.println(company);
}
}
class Main {
public static void main ( String args [ ] )
{
Encapsulation e = new Encapsulation();
e.GetBranches();
e.SetBranches(25);
e.GetBranches();
e.SetBranches(“DataFlair”);
}
}
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Question 7 of 15
7. Question
Which method is used to make the fields read only or write only ?
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Question 8 of 15
8. Question
class Rhombus {
private int side;
private int altitude;
public void calculate ( int perimeter , int a )
side = perimeter / 4;
Altitude= a;
int area = side * altitude;
System.out.println(area);
}
}
class Main {
public static void main ( String args [ ] )
{
Rhombus r = new Rhombus();
r.calculate(12,5);
}
}
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Question 9 of 15
9. Question
Which of the following is the correct syntax of the getter setter method ?
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Question 10 of 15
10. Question
Which of the following is not an advantage of Encapsulation ?
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Question 11 of 15
11. Question
class Demo {
private int a;
public void get() {
return a;
}
public void set() {
this.a = a;
}
}
class Main {
public static void main ( String args [ ] )
{
Demo obj = new Demo();
obj.set(5);
System.out.println(obj.set(5));
}
}
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Question 12 of 15
12. Question
class EncapsulationSample {
private String a = “DataFlair”;
}
class Inheritance extends EncapsulationSample {
public void display( ) {
System.out.println(a);
}
}
class Main {
public static void main ( String args [ ] )
{
Inheritance i = new Inheritance();
i.display();
}
}
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Question 13 of 15
13. Question
Which keyword is used to implement encapsulation ?
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Question 14 of 15
14. Question
class Sample {
private int length,breath;
public void Area(int l , int b ) {
private int area = l * b;
}
}
class Main {
public static void main ( String args [ ] )
{
Sample s = new Sample();
s.Area(2,3);
System.out.println(area);
}
}
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Question 15 of 15
15. Question
class Area {
private int a;
Scanner sc = new Scanner(System.in);
public void calculate () {
int Squarearea = a * a ;
}
}
class Main {
public static void main ( String args [ ] )
{
Area a = new Area();
a.calculate();
System.out.println(Squarearea);
}
}
CorrectIncorrect
Summary:
This blog post presented a concise quiz on encapsulation in Java. The quiz consisted of a single multiple-choice question focusing on the concept of grouping code and data together. While the quiz itself is brief, it serves as a springboard for further exploration.
Remember, encapsulation is a critical concept in Java programming. By effectively leveraging encapsulation principles, you can create well-structured, maintainable, and secure applications. For a deeper understanding of encapsulation, explore additional resources beyond the quiz, such as online tutorials, courses, and practice problems.