Inheritance in Java
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This document discusses inheritance in Java. It defines inheritance as a parent-child relationship between classes that allows sharing of behavior through code reuse. The key points are: inheritance allows child classes to inherit and optionally override methods and fields from the parent class; the "extends" keyword is used to create a subclass that inherits from an existing superclass; and the "super" keyword differentiates members and calls parent constructors.
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Java Inheritance | Java Course RAKESH P Java Inheritance:
→ Inheritance can be defined as the process where one class acquires the properties (methods and fields) of another.
→ The class which inherits the properties of other is known as subclass (derived class, child class) and the class whose properties are inherited is known as superclass (base class, parent class).
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{
}
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Types of Inheritance:
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{
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{
}
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Packages in javaElizabeth alexander Packages in Java allow grouping of related classes and interfaces to avoid naming collisions. Some key points about packages include:
- Packages allow for code reusability and easy location of files. The Java API uses packages to organize core classes.
- Custom packages can be created by specifying the package name at the beginning of a Java file. The class files are then compiled to the corresponding directory structure.
- The import statement and fully qualified names can be used to access classes from other packages. The classpath variable specifies locations of package directories and classes.
Java interfaces
Java interfacesElizabeth alexander Interfaces provide a common behavior that can be shared among multiple classes through implementation. An interface is a collection of abstract methods that are implemented by classes. Interfaces can contain constants, default methods, static methods, and nested types, but only default and static methods have method bodies. A class implements an interface to inherit its abstract methods. Unlike classes, interfaces cannot be instantiated, do not have constructors, and all methods are implicitly abstract and public.
Polymorphism in java
Polymorphism in javaElizabeth alexander This document discusses polymorphism and inheritance concepts in Java. It defines polymorphism as an object taking on many forms, and describes method overloading and overriding. Method overloading allows classes to have multiple methods with the same name but different parameters. Method overriding allows subclasses to provide a specific implementation of a method in the parent class. The document also discusses abstract classes and interfaces for abstraction in Java, and explains access modifiers like public, private, protected, and default.
Object oriented programming in java
Object oriented programming in javaElizabeth alexander This document discusses object-oriented programming concepts in Java such as classes, objects, inheritance, encapsulation, and polymorphism. It provides examples of defining classes with variables, methods, and constructors. It also covers creating and initializing objects, accessing instance variables and methods, and the different ways to create objects like using the new keyword, factory methods, and anonymous objects. The document also discusses strings, arrays, and core Java class libraries.
Quantitative Aptitude- Number System
Quantitative Aptitude- Number SystemElizabeth alexander 1) The document discusses number systems and properties of numbers including natural numbers, whole numbers, integers, even/odd numbers, and prime/composite numbers.
2) Formulas for expanding expressions with numbers are provided along with tests for divisibility of numbers by various factors.
3) Types of numbers such as integers, even, odd, prime and composite numbers are defined along with their key properties.
Java Programming
Java ProgrammingElizabeth alexander Java is an object-oriented programming language initially developed by Sun Microsystems. It was released in 1995. Key points:
- Java can be used to develop client-side standalone applications, applets for webpages, and server-side applications.
- It introduced the Java Virtual Machine (JVM) which allows Java programs to run on any platform that supports the JVM.
- Java's use of bytecode makes it portable and able to run on any device with a JVM, earning it the label of "Write Once, Run Anywhere".
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- 2. INHERITANCE ● A parent-child relationship between classes ● Allows sharing of the behavior of the parent class into its child classes ■ one of the major benefits of object-oriented programming (OOP) is this code sharing between classes through inheritance ● Child class can add new behavior or override existing behavior from parent ● Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of parent object. ● The idea behind inheritance in java is that you can create new classes that are built upon existing classes. When you inherit from an existing class, you can reuse methods and fields of parent class, and you can add new methods and fields also.
- 3. INHERITANCE Cont... Why use inheritance in java? ● For Method Overriding (so runtime polymorphism can be achieved). ● For Code Reusability.
- 5. SYNTAX OF JAVA INHERITANCE class Super { ..... ..... } class Sub extends Super { ..... ..... } ● The extends keyword indicates that a new class is derived from an existing class. The meaning of "extends" is to increase the functionality.
- 6. INHERITANCE TERMS ● superclass, base class, parent class: terms to describe the parent in the relationship, which shares its functionality ● subclass, derived class, child class: terms to describe the child in the relationship, which accepts functionality from its parent ● extend, inherit, derive: become a subclass of another class
- 7. THE Super KEYWORD ● The super keyword is similar to this keyword. Following are the scenarios where the super keyword is used. ■ It is used to differentiate the members of superclass from the members of subclass, if they have same names. ■ It is used to invoke the superclass constructor from subclass. ● Differentiating the Members ● If a class is inheriting the properties of another class. And if the members of the superclass have the names same as the sub class, to differentiate these variables we use super keyword as shown below. super.variable super.method();
- 8. INVOKING SUPERCLASS CONSTRUCTOR ● If a class is inheriting the properties of another class, the subclass automatically acquires the default constructor of the superclass. But if you want to call a parameterized constructor of the superclass, you need to use the super keyword as shown below. super(values);
- 10. TYPES OF INHERITANCE ● Three types of inheritance in java: single, multilevel and hierarchical. ● In java programming, multiple and hybrid inheritance is supported through interface only.
- 11. TYPES OF INHERITANCE Cont...