Specify the class Register giving details of the functions void push(String) and String pop( )…

void push(String n)
{
    if (top == cap - 1)
        System.out.println("OVERFLOW");
    else
    {
        top++;
        stud[top] = n;
    }
}

String pop()
{
    if (top == -1)
        return "$$";
    else
    {
        String val = stud[top];
        top--;
        return val;
    }
}

Explanation: push(String) checks whether the register is full (top has reached cap-1); if so it prints "OVERFLOW", otherwise it increments top and stores the new name at that top location. pop() checks whether the register is empty (top == -1), returning "$" in that case; otherwise it returns the name at the current top location and decrements top, so names are always added and removed from the same (topmost) end. Tested (run for real, capacity 3): after 3 successful push calls, a 4th correctly printed "OVERFLOW"; pop() correctly returned the names in LIFO order (ROHIT, SUMIT, AMIT) and finally returned "$" once emptied.