Core Java Assignments

For practicing Java, here are few Core Java Assignments. In Each Assignment, a specific Object Oriented Programming concept is covered. Before start this assignments, make sure you completed all the OOPs Concepts in Java here.

Core Java Assignments 0:

Goal: Learning Class Creation, Object Creation, Method Calling with Arguments, Local Variables

Create a class called Theatre
Have main method in it.
Create an instance[object] called raja of Theatre class.
Call method bookTicket(200) eg. raja.bookTicket(100)
Have method signature for bookTicket method with necessary arguments for handling the input 200.
Define bookTicket method as below.
1. Declare a local variable ticket_price in int datatype.
2. Assign 120 as value for ticket_price variable.
3. Subtract 120 from method argument (200)
4. Store result of above line into another variable called balance of int datatype.
5. return this balance to main method.
In main method, receive this balance as int balance
In main method, print as below.
System.out.println(“After booking ticket ” + balance);

Core Java Assignments 1:

Goal: Learning Method Calling, Accessing static, non-static variables from other classes, private modifier.

Steps:

Create a class Called School.
Have non-static variables as below.
int mark;
private int salary;
Have static variable as below.
static String school_name = "St. Antony's Primary School";
Define non-static methods mentioned below
void conduct_exams()
- Have a print statement inside this method
void publish_results(int mark)
- Have a print statement inside this method to print mark
Now, create another class called Teacher
Create main method inside Teacher class
Create an instance(object) for School class [Object name -> teacher]
Using 'teacher' object, call conduct_exams() method
Using 'teacher' object, call publish_results() method and pass 75 as argument here.
Print school_name
Try to access private variable salary in Teacher class and note down the error message.

Core Java Assignments 2:

Goal: Learning private, default and public Access Modifiers, Creating Package and understanding its usage, Calling Methods with/without arguments.

Check if you can create private class
Check if you can create private main method
Check if you can create Method local variable as private.

Task:

Create a package called bank.chennai.
Create a public class called ‘SBI’.
Have default non-static variables String empName, empId.
Have default static variable branch_name = ‘chennai’
Create two default, non-static methods
get_loan(int amount), create_account() with void as return datatype.
Now, in the same package(bank.creditcard), create one more default class called Account_Holder.
Have main method in this class.
Try to access all static, non-static variables and non-static methods in SBI class.
Create another package called bank.madurai.
In this package, create default class called Account_Holder_Madurai.
Have main method in this class.
Try to access all static, non-static variables and non-static methods in SBI class.
Note down the Errors and rectify those errors and make sure this class gives output without any error.

Core Java Assignments 3:

Goal: Learning Inheritance, Multilevel Inheritance, super keyword

Grandma:

Create a class called ‘Grandma’.
Declare Field as below in it.
String name = “Stella”;
Have below methods in it.
public void work()
Have print statements as you wish in the above methods’ definition.

Mother:

Create a class called ‘Mother’.
Declare Field as below in it.
String name = “Stella”;
Have below method in it.
public void work()
Have print statement to print ‘name’ and super.name in work() definition.
Add ‘super.work();’ inside work() method.

Kid:

Create a class called ‘Kid’.
Declare Field as below in it.
String name = “Suman”;
Define main method as ‘public static void main(String[] args)
Inside main method, create an instance called ‘kid’ for Kid class.
Have below methods in it.
public void work()
public void study()
Have print statements as you wish in the above two methods’ definition.
Call study() method from main method.
Inside study() method, call work() method.
Print name and super.name inside work() method.

Core Java Assignments 4:

Goal: Learning and Understanding Multilevel Inheritance, Abstraction

Create an abstract class called HeadOffice.
Have below normal methods in it. 2.1. public void check_accounts(int amount)
- Have a print statement inside here
  2.2. public int pay_tax(int amount)
- return this.amount from here
Have an abstract method as below.
3.1. public abstract void receive_Customers()
Create another abstract class called Branch_Plan as sub class of HeadOffice
Have main method in it.
Add a print statement inside main method.
Add below method