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'.

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.