#22 Class and Object Practical in JAVA | Skyhighes | Lecture 22

Here's a practical demonstration of classes and objects in Java:

1. Create a Class:

Java
public class Calculator {
int num1;
int num2;

public int add() {
return num1 + num2;
}

public int subtract() {
return num1 - num2;
}
}
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2. Create Objects of the Class:

Java
Calculator calc1 = new Calculator();
Calculator calc2 = new Calculator();
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3. Access and Modify Object Attributes:

Java
calc1.num1 = 10;
calc1.num2 = 5;

calc2.num1 = 20;
calc2.num2 = 8;
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4. Call Object Methods:

Java
int result1 = calc1.add(); // result1 will be 15
int result2 = calc2.subtract(); // result2 will be 12

System.out.println("Result of addition: " + result1);
System.out.println("Result of subtraction: " + result2);
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Output:

Result of addition: 15
Result of subtraction: 12
Key Points:

Each object has its own distinct values for attributes (num1 and num2).
Methods (add() and subtract()) operate on the object's specific data.
Multiple objects of the same class can exist independently.
Additional Examples:

Create a Person class with attributes like name, age, and address, and methods like greet() and introduce().
Create a BankAccount class with attributes like accountNumber, balance, and methods like deposit(), withdraw(), and checkBalance().
Create a Car class with attributes like make, model, color, and methods like start(), stop(), and accelerate().
Experiment with different classes and objects to solidify your understanding of these fundamental OOP concepts in Java!