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There are many ways to achieve abstraction in object-oriented programmings, such as encapsulation and inheritance.
A Java program is also a great example of abstraction. Here java takes care of converting simple statements to machine language and hides the inner implementation details from the outer world.
Encapsulation Encapsulation is the technique used to implement abstraction in object-oriented programming. Encapsulation is used for access restriction to class members and methods.
Access modifier keywords are used for encapsulation in object oriented programming.
For example, encapsulation in java is achieved using private, protected and public keywords. Polymorphism Polymorphism is the concept where an object behaves differently in different situations.
There are two types of polymorphism — compile time polymorphism and runtime polymorphism. Compile time polymorphism is achieved by method overloading.
For example, we can have a class as below. This is a case of method overloading because all the methods name is same and arguments are different. This is also called as method overriding because subclass has to override the superclass method for runtime polymorphism. If we are working in terms of superclass, the actual implementation class is decided at runtime.
Compiler is not able to decide which class method will be invoked. This decision is done at runtime, hence the name as runtime polymorphism or dynamic method dispatch. Copy package com.
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Below is an example of runtime polymorphism. Inheritance Inheritance is the object oriented programming concept where an object is based on another object.
Inheritance is the mechanism of code reuse. In C programming, int data type occupies 2 bytes of memory for bit architecture and 4 bytes of memory for bit architecture. However, it occupies 4 bytes of memory for both 32 and bit architectures in Java.
Portable Java is portable because it facilitates you to carry the Java bytecode to any platform. It doesn't require any implementation. High-performance Java is faster than other traditional interpreted programming languages because Java bytecode is "close" to native code.
It is still a little bit slower than a compiled language e.
Java is an interpreted language that is why it is slower than compiled languages, e. Distributed Java is distributed because it facilitates users to create distributed applications in Java.
This feature of Java makes us able to access files by calling the methods from any machine on the internet. Multi-threaded A thread is like a separate program, executing concurrently.
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We can write Java programs that deal with many tasks at once by defining multiple threads. The main advantage of multi-threading is that it doesn't occupy memory for each thread.
It shares a common memory area. Threads are important for multi-media, Web applications, etc. Dynamic Java is a dynamic language. It supports dynamic loading of classes.
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It means classes are loaded on demand. It also supports functions from its native languages, i. Java supports dynamic compilation and automatic memory management garbage collection.So what is the solution?
They also form the best practices to be followed for designing our application classes. All object references are initialized to null in Java. Encapsulation is used for access restriction to class members and methods.
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It doesn't require any implementation. JavaTpoint guides the beginners in depth easy way. Java is an interpreted language that is why it is slower than compiled languages, e.
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