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Java oops concepts wiki portable#
Java oops concepts wiki software#
Java oops concepts wiki code#

It also supports functions from its native languages, i.e., C and C++. It supports the dynamic loading of classes. Threads are important for multi-media, Web applications, etc. The main advantage of multi-threading is that it doesn't occupy memory for each thread. We can write Java programs that deal with many tasks at once by defining multiple threads. Multi-threadedĪ thread is like a separate program, executing concurrently. This feature of Java makes us able to access files by calling the methods from any machine on the internet. RMI and EJB are used for creating distributed applications. Java is distributed because it facilitates users to create distributed applications in Java. Java is an interpreted language that is why it is slower than compiled languages, e.g., C, C++, etc. It is still a little bit slower than a compiled language (e.g., C++). Java is faster than other traditional interpreted programming languages because Java bytecode is "close" to native code.

Java oops concepts wiki portable#

Java is portable because it facilitates you to carry the Java bytecode to any platform. However, it occupies 4 bytes of memory for both 32 and 64-bit architectures in Java. In C programming, int data type occupies 2 bytes of memory for 32-bit architecture and 4 bytes of memory for 64-bit architecture. Java is architecture neutral because there are no implementation dependent features, for example, the size of primitive types is fixed. There are exception handling and the type checking mechanism in Java.Java provides automatic garbage collection which runs on the Java Virtual Machine to get rid of objects which are not being used by a Java application anymore.There is a lack of pointers that avoids security problems.Some security can also be provided by an application developer explicitly through SSL, JAAS, Cryptography, etc.

Java language provides these securities by default. Security Manager: It determines what resources a class can access such as reading and writing to the local disk.

Java oops concepts wiki code#

Bytecode Verifier: It checks the code fragments for illegal code that can violate access rights to objects.

It adds security by separating the package for the classes of the local file system from those that are imported from network sources.

Classloader: Classloader in Java is a part of the Java Runtime Environment (JRE) which is used to load Java classes into the Java Virtual Machine dynamically.

Java Programs run inside a virtual machine sandbox.

With Java, we can develop virus-free systems. This bytecode is a platform-independent code because it can be run on multiple platforms, i.e., Write Once and Run Anywhere (WORA). Java code is compiled by the compiler and converted into bytecode. Java code can be executed on multiple platforms, for example, Windows, Linux, Sun Solaris, Mac/OS, etc. The Java platform differs from most other platforms in the sense that it is a software-based platform that runs on top of other hardware-based platforms. There are two types of platforms software-based and hardware-based.

Java oops concepts wiki software#

A platform is the hardware or software environment in which a program runs. which are compiled into platform specific machines while Java is a write once, run anywhere language. Java is platform independent because it is different from other languages like C, C++, etc. Object-oriented programming (OOPs) is a methodology that simplifies software development and maintenance by providing some rules. Object-oriented means we organize our software as a combination of different types of objects that incorporate both data and behavior. Java is an object-oriented programming language.

There is no need to remove unreferenced objects because there is an Automatic Garbage Collection in Java.

Java has removed many complicated and rarely-used features, for example, explicit pointers, operator overloading, etc.

Java syntax is based on C++ (so easier for programmers to learn it after C++).

According to Sun Microsystem, Java language is a simple programming language because: To make the work easy, we can bundle the common features and properties of all vehicle types into a module (a class in case of Java).Java is very easy to learn, and its syntax is simple, clean and easy to understand. We may ask the question, why do we need inheritance? To answer this, let's consider a vehicle manufacturer who manufactures different types of vehicles, such as cars, buses, trams, and trucks.

The Car IS-A Vehicle. So, it has all the characteristics of a Vehicle. When we extend a class, we form an IS-A relationship.