Java Lab Questions

1. a. Write a java program to calculate area of a rectangle.

   b. Write a java program to calculate the area of circle.

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2. a. Write a java program to check even or odd.

   b. Write a java program to swap two numbers using third variable.

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3. a. write a java program to display even numbers between 1 to n.

   b. Write a java program to display grade of the student by entering 5 subjects marks and calculating percentage of marks with the following conditions:

   Percentage	Grade
   >80	A+
   >70	A
   >60	B+
   >50	B
   >40	C
   >35	D
   otherwise	F

   (Jan 19)

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4. a. Write a java program to check whether given number is +ve, -ve or zero. (Jan 23)

   b. Write a java program to display biggest of three numbers using nested if else. (Feb 6)

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5. a. Write a java program to find factorial of a number. (Feb 6)

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6. a. Write a menu driven program to calculate addition, multiplication and division of 2 numbers and also find the remainder using java. (Feb 7)

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7. a. Suppose we are calculating weekly sale of a girl. If x is the number of products sold in a week her weekly salary is given by

               { 4x + 100 for x < 40 }
   
   Salary  =   { 300 for x = 40 }
   
               { 4.5x + 150 for x > 40 }
   

   Write a java program. (Feb 9)

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8. a. Write a java program to count the even numbers and odd numbers within the range of 1 to n. (Feb 9)

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9. a. Write a java program to find square root, and logarithm using inbuilt Math class function. (Feb 9)

   b. Write a java program to find $x^y$, and maximum of x and y using inbuilt Math class function. (Feb 9)

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10. a. Write a java program to display multiplication table for n numbers of rows and columns as follows: (Feb 13)

    1   2   3   4   .   .   n
    2   4   6   8   
    3   6   9   12  
    4   8   12  16  
    .  
    .
    n
    

    b. Write a java program to find power of $2^n$. (Feb 14)

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11. a. Write a program to find reverse of an integer number. (Feb 20)

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12. a. Write a java program by defining a class Rectangle with 2 methods getdata() and rectArea() and instantiate with an object to find area of a Rectangle. (Feb 21)

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13. a. Write a java program to define a class Rectangle to calculate area of a rectangle and use constructor. (Feb 23)

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14. a. Write a java program by defining a class Arithmetic_operator with methods add(), multiplication(), division() and subtraction() for two variables. (Feb 27)

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15. a. Write a java program with class Employee and its members emp_details() and salary(), name, emp_id, address, salary. Display the details and salary of three employee. (Feb 27)

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16. a. Define a class Room with method area() and another class Bedroom with extending the feature of Room class, along with a method volume(). Calculate area volume of a room by performing simple single Inheritance. (Feb 28)

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17. a. Write a java program to find biggest of two numbers by nesting of methods. (March 1)

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18. a. Write a java program to find the area of a square and rectangle by overloading constructor method. (March 1)

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19. a. Write a java program to show the use of methods overriding. By defining a class super with method display() and a subclass sub with method display(). (March 5)

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20. a. Write a java program to overload a method area for finding out area of a square, rectangle and circle. (March 8)

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21. a. Define a class Employee with member variables employee_no, name, address and a constructor method and another class Worker with data members no_of_hours and a constructor method. Perform required inheritance and display employee workers details (atleast 3 workers details). (March 12)

    class Employee{
    
    }
    
    class Worker extends Employee{
    
    }

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22. a. Write a java program by defining an interface Area and two classes Rectangle and Circle to implement it for finding area of a Circle and a Rectangle. (March 12)

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23. a. Write a program to show how the concept of multiple inheritance can be illustrated in java using interface. (March 20)

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24. a. Write a program to show method overriding by defining a class Figure with method area(), constructor and a sub class Rectangle with another method area() for finding area of a rectangle. Override the method area() in Figure class. (April 2)

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25. a. Sort an array in descending order. (April 9)

    b. Read an array of n elements and calculate average of the elements. (April 3)

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26. a. Write a java program to display two dimensional multiplication table as follows: (April 9)

      1   2   3   4   5   6   7   8   9  10
      2   4   6   8  10  12  14  16  18  20
      3   6   9  12  15  18  21  24  27  30
      4   8  12  16  20  24  28  32  36  40
      5  10  15  20  25  30  35  40  45  50
      6  12  18  24  30  36  42  48  54  60
      7  14  21  28  35  42  49  56  63  70
      8  16  24  32  40  48  56  64  72  80
      9  18  27  36  45  54  63  72  81  90
     10  20  30  40  50  60  70  80  90 100
    

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27. a. Create the java packages as follows (April 10)

    pack1/                  pack2/
    |                       |
    |--- class A            |--- class X
    |--- class B            |--- class Y
    |--- pack3/             
    |    |
    |    |--- class E
    |    |--- class D