CoreJava - ClassesObjectsMethods

CoreJava - ClassesObjectsMethods - Assignment

Classes, Objects, Methods:

1. Create a class called "Person" with instance variables for name, age, and gender.
2. Create an object of the "Person" class and set its instance variables.
3. Write a method in the "Person" class that prints out the person's name, age, and gender.
4. Write a method that calculates the age of a person based on their birth year.
5. Write a method that checks if a person is an adult (over 18 years old).
6. Create a class called "Rectangle" with instance variables for length and width.
7. Write a method in the "Rectangle" class that calculates the area of the rectangle.
8. Write a method that calculates the perimeter of a rectangle.
9. Create a class called "Student" with instance variables for name, grade, and GPA.
0 Write a method that prints out a student's name, grade, and GPA.

Method Signature, Static/Non-Static, Return Keyword, Parameterization

11. Write a method that takes two integers as parameters and returns their sum.
12. Write a method that takes a string as a parameter and returns the length of the string.
13. Write a method that takes an array of integers as a parameter and returns the sum of the array.
14. Write a static method that calculates the factorial of a number.
15. Write a non-static method that calculates the area of a circle.
16. Write a method that takes two integers as parameters and returns the larger of the two.
17. Write a method that takes two integers as parameters and returns their product.
18. Write a method that takes a string as a parameter and returns the string in reverse.
19. Write a method that takes an array of integers as a parameter and returns the average of the array.
20. Write a parameterized constructor for the "Rectangle" class that takes length and width as parameters and sets the instance variables.

Pass By Value & Pass by Reference:

21. Write a method that takes an integer as a parameter and increments it by 1.
22. Write a method that takes an array of integers as a parameter and sets all values to 0.
23. Write a method that takes an object of the "Person" class as a parameter and sets their age to 0.
24. Write a method that takes a string as a parameter and appends "hello" to the string.
25. Write a method that takes an array of strings as a parameter and sorts the array in alphabetical order.

Recursive Methods:

26. Write a method that calculates the factorial of a number recursively.
27. Write a method that calculates the Fibonacci sequence recursively.
28. Write a method that prints out the numbers from 1 to n recursively.
29. Write a method that calculates the sum of the digits of a number recursively.
30. Write a method that checks if a string is a palindrome recursively.

Constructors:

31. Write a default constructor for the "Person" class that sets the instance variables to default values.
32. Write a parameterized constructor for the "Person" class that takes name, age, and gender as parameters and sets the instance variables.
33. Write a non-parameterized constructor for the "Rectangle" class that sets the length and width to 0.
34. Write a parameterized constructor for the "Rectangle" class that takes length and width as parameters and sets the instance variables.
35. Write a constructor for the "Student" class that sets the instance variables to default values.

Variables:

36. Create a static variable called "count" in the "Person" class that counts the number of persons created.
37. Create an instance variable called "grade" in the "Student" class that represents the student's grade level.
38. Create a local variable called "sum" in a method that calculates the sum of two integers.
39. Create an instance variable called "balance" in a bank account class.
40. Create a static variable called "PI" in a math class that represents the value of pi.

Access Modifiers/Specifiers:

41. Create a public method in a class that prints out a message.
42. Create a private instance variable in a class that represents the class's password.
43. Create a protected method in a class that returns the class's name.
44. Create a default instance variable in a class that represents the class's size.
45. Create a public static variable in a class that represents the class's ID.

Operators:

46. Write a program that uses the relational operators to compare two integers.
47. Write a program that uses the assignment operator to assign a value to a variable.
48. Write a program that uses the arithmetic operators to calculate the sum, difference, product, and quotient of two integers.
49. Write a program that uses the logical operators to determine if a number is positive and even.
50. Write a program that uses the unary operators to increment and decrement a variable.

Conditional Statements and Loops:

51. Write a program that uses an if statement to determine if a number is positive or negative.
52. Write a program that uses an if-else statement to determine if a number is even or odd.
53. Write a program that uses a switch statement to determine the day of the week.
54. Write a program that uses a for loop to print out the numbers from 1 to 10.
55. Write a program that uses a while loop to calculate the factorial of a number.
56. Write a program that uses a do-while loop to ask the user for their name and prints out a greeting.
57. Write a program that uses a for-each loop to print out the elements of an array.
58. Write a program that uses a break statement to exit a loop.
59. Write a program that uses a continue statement to skip an iteration of a loop.
60. Write a program that uses nested loops to print out a multiplication table.

Inheritance:

61. Create a class called "Animal" with instance variables for name and age.
62. Create a subclass of "Animal" called "Dog" with instance variables for breed and weight.
63. Create a method in the "Animal" class called "makeSound".
64. Override the "makeSound" method in the "Dog" class to make a barking sound.
65. Create a constructor in the "Animal" class that takes arguments for name and age.

CGT