Object-Oriented Programming in Java – Classes, Objects & Constructors

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Object-Oriented Programming in Java – Classes, Objects & Constructors · devs3

java

public class Main {
    public static void main(String[] args) {
        Car myCar = new Car(); // create object
        myCar.model = "Toyota";
        myCar.color = "Red";

        myCar.displayInfo();
    }
}

java

class Car {
    String color;
    String model;

    // Constructor
    Car(String c, String m) {
        color = c;
        model = m;
    }

    void displayInfo() {
        System.out.println("Car Model: " + model);
        System.out.println("Car Color: " + color);
    }
}

public class Main {
    public static void main(String[] args) {
        Car car1 = new Car("Blue", "Honda");
        Car car2 = new Car("Black", "BMW");

        car1.displayInfo();
        car2.displayInfo();
    }
}

java

class Car {
    String color;
    String model;

    Car(String color, String model) {
        this.color = color; // resolve naming conflict
        this.model = model;
    }

    void displayInfo() {
        System.out.println("Car Model: " + this.model);
        System.out.println("Car Color: " + this.color);
    }
}

java

class Student {
    String name;
    int age;
    double cgpa;

    // Constructor
    Student(String name, int age, double cgpa) {
        this.name = name;
        this.age = age;
        this.cgpa = cgpa;
    }

    void displayStudent() {
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
        System.out.println("CGPA: " + cgpa);
        System.out.println("--------------");
    }
}

public class Main {
    public static void main(String[] args) {
        Student s1 = new Student("Rahim", 20, 3.8);
        Student s2 = new Student("Karim", 21, 3.6);

        s1.displayStudent();
        s2.displayStudent();
    }
}

Object-Oriented Programming in Java – Classes, Objects & Constructors

Introduction

What Is Object-Oriented Programming (OOP)?

Join the conversation

Comments

Java Spring Boot Http request cycle

Java spring boot development environment setup process step by step for windows 11

Key Concepts in OOP:

1️⃣ Classes in Java

Syntax:

Example:

2️⃣ Objects in Java

Example:

3️⃣ Constructors in Java

Example:

4️⃣ The `this` Keyword

Example:

5️⃣ Real-World Example: Student Class

Common Beginner Mistakes

Summary

Week 6 Preview 👀

Introduction

What Is Object-Oriented Programming (OOP)?

Join the conversation

Comments

Keep reading

Java Spring Boot Http request cycle

Java spring boot development environment setup process step by step for windows 11

Key Concepts in OOP:

1️⃣ Classes in Java

Syntax:

Example:

2️⃣ Objects in Java

Example:

3️⃣ Constructors in Java

Example:

4️⃣ The this Keyword

Example:

5️⃣ Real-World Example: Student Class

Common Beginner Mistakes

Summary

Week 6 Preview 👀

4️⃣ The `this` Keyword