In Java, Inheritance allows you to create new classes by building upon pre-existing classes. When you inherit from an existing class, it’s like borrowing its methods and properties. Plus, you can also throw in some new methods and properties of your own in your new class.<\/p>\n
Why Use Inheritance in Java<\/h2>\n\n- Code Reusability:\u00a0<\/b>Inheritance helps you recycle code. If you have a class that does something useful, you can make a new class that uses everything from the first one, saving you from writing the same code all over again.<\/li>\n
- Extensibility:\u00a0<\/b>You can add new things to your class. Imagine you have a “Vehicle”<\/strong> class. With Inheritance, you can create a “Car” class that’s a type of vehicle with its unique car-related stuff.<\/li>\n
- Organized Hierarchy:<\/b> Inheritance helps you organize your classes. Think of it like creating a family tree for your classes. You can group related things. For example, all animals have some common traits, so you can put them in the “Animal” group and then make subclasses like “Dog” and “Cat.”<\/li>\n
- Polymorphism:<\/b> Inheritance is like having a common language. Even if you have different types of objects, they can all understand the same language (methods). So you can use them flexibly and dynamically in your program.<\/li>\n<\/ul>\n
Terms Used in Inheritance<\/h3>\n\n- Class:<\/b>\u00a0A class is a fundamental concept in object-oriented programming (OOP). It serves as a blueprint or template for creating objects. In a class, you define the properties (attributes) and behaviors (methods) that objects created from that class will have.<\/li>\n
- Child-class\/sub-class: <\/b>A subclass, in object-oriented programming, is a class that inherits attributes and behaviors from another class, often referred to as the superclass or parent class. The subclass extends or specializes the functionality of the parent class by adding new attributes and methods or modifying the inherited ones.<\/li>\n
- Parent Class\/Super Class:<\/b>\u00a0A parent class, also known as a superclass or base class, is a class from which one or more other classes, called child classes or subclasses, inherit properties and behaviors. In object-oriented programming (OOP), the parent class serves as a blueprint or template for the child classes, defining common attributes and methods that the child classes can use.<\/li>\n<\/ul>\n
Syntax of Java Inheritance:<\/h4>\n<\/div>\n\r\n\u00a0class childclass-name extends Parentclass-name\u00a0\u00a0\r\n\t{\u00a0\u00a0\r\n\t\t\/\/methods and attributes\u00a0\u00a0\r\n\t}<\/code><\/pre>\n<\/div>\nJava Inheritance Example<\/h2>\n
![\"Java](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2023\/11\/3XMkt61wti8LchKKBoC7aYBXSs1hvtOgmqXihAnh-192x300.png\" "\\"Java")
<\/a><\/p>\nAs displayed in the above figure, MountainBike is the subclass, and Bicycle is the superclass. The relationship between the two classes is MountainBike IS-A Bicycle. It means that MountainBike is a type of Bicycle.<\/p>\n
Example<\/strong><\/p>\n<\/div>\nclass Bicycle { \r\n public int gear = 5;\r\n} \r\nclass MountainBike extends Bicycle { \r\n public int seatHeight = 100;\r\n \r\n public static void main(String args[]) { \r\n MountainBike m = new MountainBike(); \r\n System.out.println(\"Bicycle gear is: \" + m.gear); \r\n System.out.println(\"Seat height of Bicycle is: \" + m.seatHeight); \r\n } \r\n}\r\nOutput:\r\nBicycle gear is:5\r\n\u00a0\tseatHeight of Bicycle is:100\r\n<\/code><\/pre>\nIn the provided example, a MountainBike object can access its own class’s fields and the fields of the Bicycle class; this is a principle of code reusability in object-oriented programming.<\/p>\n
Types of Inheritance in Java<\/h3>\n
Inheritance can be categorized into three main types:<\/p>\n
\n- Single Inheritance,<\/a><\/li>\n
- Multilevel Inheritance,<\/a><\/li>\n
- Hierarchical inheritance.<\/a><\/li>\n<\/ol>\n
In Java programming, multiple and hybrid Inheritance is supported through the interface only.<\/p>\n
1) Single Inheritance<\/h3>\n
When a class inherits another class, it is known as a single inheritance.<\/p>\n
![\"Single](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2023\/11\/8tRBMqzoJbERHB1bi7uzogllzwPxUkL0LsgxZjRl-e1698932375116-240x300.png\" "\\"Single")
<\/a><\/p>\nIn your example, the “Apple”<\/strong> class is like a student who learns from a “Fruit” teacher. This is an example of single Inheritance, where a student (Apple) learns from one teacher (Fruit).<\/p>\nExample<\/strong><\/p>\n<\/div>\nclass Fruit {\r\n\t\u00a0 \u00a0 void fruit() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is a fruit.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tclass Apple extends Fruit {\r\n\t\u00a0 \u00a0 void display() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is an apple.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tpublic class Main {\r\n\t\u00a0 \u00a0 public static void main(String[] args) {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 Apple apple = new Apple();\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.display(); \/\/ Calls the display method of Apple\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.fruit();\u00a0 \/\/ Calls the fruit method of Fruit\r\n\t\u00a0 \u00a0 }\r\n\t}<\/code><\/pre>\nOutput<\/strong><\/p>\nThis is an apple.
\nThis is a fruit.<\/p>\n
<\/div>\n2) Multilevel Inheritance<\/h3>\n
Multilevel Inheritance in programming occurs when a class inherits from another class, and then another class inherits from that derived class, creating a chain of Inheritance. This means that the derived class becomes a parent class for another class.<\/p>\n
Terms Used in Inheritance<\/h3>\n\n- Class:<\/b>\u00a0A class is a fundamental concept in object-oriented programming (OOP). It serves as a blueprint or template for creating objects. In a class, you define the properties (attributes) and behaviors (methods) that objects created from that class will have.<\/li>\n
- Child-class\/sub-class: <\/b>A subclass, in object-oriented programming, is a class that inherits attributes and behaviors from another class, often referred to as the superclass or parent class. The subclass extends or specializes the functionality of the parent class by adding new attributes and methods or modifying the inherited ones.<\/li>\n
- Parent Class\/Super Class:<\/b>\u00a0A parent class, also known as a superclass or base class, is a class from which one or more other classes, called child classes or subclasses, inherit properties and behaviors. In object-oriented programming (OOP), the parent class serves as a blueprint or template for the child classes, defining common attributes and methods that the child classes can use.<\/li>\n<\/ul>\n
Syntax of Java Inheritance:<\/h4>\n<\/div>\n\r\n\u00a0class childclass-name extends Parentclass-name\u00a0\u00a0\r\n\t{\u00a0\u00a0\r\n\t\t\/\/methods and attributes\u00a0\u00a0\r\n\t}<\/code><\/pre>\n<\/div>\nJava Inheritance Example<\/h2>\n
<\/a><\/p>\nAs displayed in the above figure, MountainBike is the subclass, and Bicycle is the superclass. The relationship between the two classes is MountainBike IS-A Bicycle. It means that MountainBike is a type of Bicycle.<\/p>\n
Example<\/strong><\/p>\n<\/div>\nclass Bicycle { \r\n public int gear = 5;\r\n} \r\nclass MountainBike extends Bicycle { \r\n public int seatHeight = 100;\r\n \r\n public static void main(String args[]) { \r\n MountainBike m = new MountainBike(); \r\n System.out.println(\"Bicycle gear is: \" + m.gear); \r\n System.out.println(\"Seat height of Bicycle is: \" + m.seatHeight); \r\n } \r\n}\r\nOutput:\r\nBicycle gear is:5\r\n\u00a0\tseatHeight of Bicycle is:100\r\n<\/code><\/pre>\nIn the provided example, a MountainBike object can access its own class’s fields and the fields of the Bicycle class; this is a principle of code reusability in object-oriented programming.<\/p>\n
Types of Inheritance in Java<\/h3>\n
Inheritance can be categorized into three main types:<\/p>\n
\n- Single Inheritance,<\/a><\/li>\n
- Multilevel Inheritance,<\/a><\/li>\n
- Hierarchical inheritance.<\/a><\/li>\n<\/ol>\n
In Java programming, multiple and hybrid Inheritance is supported through the interface only.<\/p>\n
1) Single Inheritance<\/h3>\n
When a class inherits another class, it is known as a single inheritance.<\/p>\n
<\/a><\/p>\nIn your example, the “Apple”<\/strong> class is like a student who learns from a “Fruit” teacher. This is an example of single Inheritance, where a student (Apple) learns from one teacher (Fruit).<\/p>\nExample<\/strong><\/p>\n<\/div>\nclass Fruit {\r\n\t\u00a0 \u00a0 void fruit() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is a fruit.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tclass Apple extends Fruit {\r\n\t\u00a0 \u00a0 void display() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is an apple.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tpublic class Main {\r\n\t\u00a0 \u00a0 public static void main(String[] args) {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 Apple apple = new Apple();\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.display(); \/\/ Calls the display method of Apple\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.fruit();\u00a0 \/\/ Calls the fruit method of Fruit\r\n\t\u00a0 \u00a0 }\r\n\t}<\/code><\/pre>\nOutput<\/strong><\/p>\nThis is an apple.
\nThis is a fruit.<\/p>\n
<\/div>\n2) Multilevel Inheritance<\/h3>\n
Multilevel Inheritance in programming occurs when a class inherits from another class, and then another class inherits from that derived class, creating a chain of Inheritance. This means that the derived class becomes a parent class for another class.<\/p>\n
Syntax of Java Inheritance:<\/h4>\n<\/div>\n\r\n\u00a0class childclass-name extends Parentclass-name\u00a0\u00a0\r\n\t{\u00a0\u00a0\r\n\t\t\/\/methods and attributes\u00a0\u00a0\r\n\t}<\/code><\/pre>\n<\/div>\nJava Inheritance Example<\/h2>\n
<\/a><\/p>\nAs displayed in the above figure, MountainBike is the subclass, and Bicycle is the superclass. The relationship between the two classes is MountainBike IS-A Bicycle. It means that MountainBike is a type of Bicycle.<\/p>\n
Example<\/strong><\/p>\n<\/div>\nclass Bicycle { \r\n public int gear = 5;\r\n} \r\nclass MountainBike extends Bicycle { \r\n public int seatHeight = 100;\r\n \r\n public static void main(String args[]) { \r\n MountainBike m = new MountainBike(); \r\n System.out.println(\"Bicycle gear is: \" + m.gear); \r\n System.out.println(\"Seat height of Bicycle is: \" + m.seatHeight); \r\n } \r\n}\r\nOutput:\r\nBicycle gear is:5\r\n\u00a0\tseatHeight of Bicycle is:100\r\n<\/code><\/pre>\nIn the provided example, a MountainBike object can access its own class’s fields and the fields of the Bicycle class; this is a principle of code reusability in object-oriented programming.<\/p>\n
Types of Inheritance in Java<\/h3>\n
Inheritance can be categorized into three main types:<\/p>\n
\n- Single Inheritance,<\/a><\/li>\n
- Multilevel Inheritance,<\/a><\/li>\n
- Hierarchical inheritance.<\/a><\/li>\n<\/ol>\n
In Java programming, multiple and hybrid Inheritance is supported through the interface only.<\/p>\n
1) Single Inheritance<\/h3>\n
When a class inherits another class, it is known as a single inheritance.<\/p>\n
<\/a><\/p>\nIn your example, the “Apple”<\/strong> class is like a student who learns from a “Fruit” teacher. This is an example of single Inheritance, where a student (Apple) learns from one teacher (Fruit).<\/p>\nExample<\/strong><\/p>\n<\/div>\nclass Fruit {\r\n\t\u00a0 \u00a0 void fruit() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is a fruit.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tclass Apple extends Fruit {\r\n\t\u00a0 \u00a0 void display() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is an apple.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tpublic class Main {\r\n\t\u00a0 \u00a0 public static void main(String[] args) {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 Apple apple = new Apple();\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.display(); \/\/ Calls the display method of Apple\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.fruit();\u00a0 \/\/ Calls the fruit method of Fruit\r\n\t\u00a0 \u00a0 }\r\n\t}<\/code><\/pre>\nOutput<\/strong><\/p>\nThis is an apple.
\nThis is a fruit.<\/p>\n
<\/div>\n2) Multilevel Inheritance<\/h3>\n
Multilevel Inheritance in programming occurs when a class inherits from another class, and then another class inherits from that derived class, creating a chain of Inheritance. This means that the derived class becomes a parent class for another class.<\/p>\n
\r\n\u00a0class childclass-name extends Parentclass-name\u00a0\u00a0\r\n\t{\u00a0\u00a0\r\n\t\t\/\/methods and attributes\u00a0\u00a0\r\n\t}<\/code><\/pre>\n<\/div>\nJava Inheritance Example<\/h2>\n
<\/a><\/p>\nAs displayed in the above figure, MountainBike is the subclass, and Bicycle is the superclass. The relationship between the two classes is MountainBike IS-A Bicycle. It means that MountainBike is a type of Bicycle.<\/p>\n
Example<\/strong><\/p>\n<\/div>\nclass Bicycle { \r\n public int gear = 5;\r\n} \r\nclass MountainBike extends Bicycle { \r\n public int seatHeight = 100;\r\n \r\n public static void main(String args[]) { \r\n MountainBike m = new MountainBike(); \r\n System.out.println(\"Bicycle gear is: \" + m.gear); \r\n System.out.println(\"Seat height of Bicycle is: \" + m.seatHeight); \r\n } \r\n}\r\nOutput:\r\nBicycle gear is:5\r\n\u00a0\tseatHeight of Bicycle is:100\r\n<\/code><\/pre>\nIn the provided example, a MountainBike object can access its own class’s fields and the fields of the Bicycle class; this is a principle of code reusability in object-oriented programming.<\/p>\n
Types of Inheritance in Java<\/h3>\n
Inheritance can be categorized into three main types:<\/p>\n
\n- Single Inheritance,<\/a><\/li>\n
- Multilevel Inheritance,<\/a><\/li>\n
- Hierarchical inheritance.<\/a><\/li>\n<\/ol>\n
In Java programming, multiple and hybrid Inheritance is supported through the interface only.<\/p>\n
1) Single Inheritance<\/h3>\n
When a class inherits another class, it is known as a single inheritance.<\/p>\n
<\/a><\/p>\nIn your example, the “Apple”<\/strong> class is like a student who learns from a “Fruit” teacher. This is an example of single Inheritance, where a student (Apple) learns from one teacher (Fruit).<\/p>\nExample<\/strong><\/p>\n<\/div>\nclass Fruit {\r\n\t\u00a0 \u00a0 void fruit() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is a fruit.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tclass Apple extends Fruit {\r\n\t\u00a0 \u00a0 void display() {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"This is an apple.\");\r\n\t\u00a0 \u00a0 }\r\n\t}\r\n\tpublic class Main {\r\n\t\u00a0 \u00a0 public static void main(String[] args) {\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 Apple apple = new Apple();\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.display(); \/\/ Calls the display method of Apple\r\n\t\u00a0 \u00a0 \u00a0 \u00a0 apple.fruit();\u00a0 \/\/ Calls the fruit method of Fruit\r\n\t\u00a0 \u00a0 }\r\n\t}<\/code><\/pre>\nOutput<\/strong><\/p>\nThis is an apple.
\nThis is a fruit.<\/p>\n
<\/div>\n2) Multilevel Inheritance<\/h3>\n
Multilevel Inheritance in programming occurs when a class inherits from another class, and then another class inherits from that derived class, creating a chain of Inheritance. This means that the derived class becomes a parent class for another class.<\/p>\n
![\"Multilevel](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2023\/11\/N365OHxPMFVUqSMvaI05MJTYTDaxxYdGW2Om6g0d-e1698932412294-153x300.png\" "\\"Multilevel")
<\/a><\/p>\n![\"Hierarchical](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2023\/11\/PjMcMWMiDXYlsqhpl0nYpAf2ogAnMt7tL2OQUOOx-e1698932442694-300x176.png\" "\\"Hierarchical")
<\/a><\/p>\n