Question

Create a class 'ProblemSolution' with following characteristics A public method 'solution' without parameters and return type is int. Create object of class 'Student' inside 'solution' method and return the value of ""rollNumber"" from the class 'Student'.

Answer 1

Answer:

The program to this question as follows:

Program:

class Student //defining class student

{

int rollNumber=1001; //defining integer variable rollnumber and assign value

int value() //defining method value

{

return rollNumber; //return value

}

}

public class ProblemSolution extends Student //defining class problemSolution that inherits Student

{

int solution() //defining method solution

{

Student stu=new Student(); //creating student class object

return stu.value(); //call function using return keyword  

}

public static void main(String ax[]) //defining main method

{

int result; //defining integer variable result

ProblemSolution ps=new ProblemSolution(); //creating class object

result=ps.solution(); //holding value of solution function

System.out.println("rollNumber value is: "+result); //print value

}

}

Output:

rollNumber value is: 1001

Explanation:

In the above java code two-class "Student and ProblemSolution" is defined, in which student class an integer variable rollNumber is defined, that holds a value "1001", and inside this class, a method "value" is defined, that return above variable value.

• In the next step, class "ProblemSolution" is defined, that inherits the student class, inside this class two method "solution and the main method" is defined.
• Inside the solution method, the student class object is created and this method uses the return keyword to call the student class method "value".
• In the main method, an integer variable "result" is defined, which holds its method "solution" value and uses print function to print its value.