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Key Features of the Java Language

There were many other primary goals in the creation of the Java language.Those features are :

Simple

Java is simpler than most other languages that are used to create server applications, because of its consistent enforcement of the object model. The large, standard set of class libraries brings powerful tools to Java developers on all platforms.

Automatic storage management

A JVM automatically performs all memory allocation and deallocation while the program is running. Java programmers cannot explicitly allocate memory for new objects or free memory for objects that are no longer referenced. Instead, they depend on a JVM to perform these operations. The process of freeing memory is known as garbage collection.

Strong typing

Before you use a field, you must declare the type of the field. Strong typing in Java makes it possible to provide a reasonable and safe solution to interlanguage calls between Java and PL/SQL applications, and to integrate Java and SQL calls within the same application.

No pointers

Although Java is quite similar to C in its syntax, it does not support direct pointers or pointer manipulation. You pass all parameters, except primitive types, by reference and not by value. As a result, the object identity is preserved. Java does not provide low level, direct access to pointers, thereby eliminating any possibility of memory corruption and leaks.

Exception handling

Java exceptions are objects. Java requires developers to declare which exceptions can be thrown by methods in any particular class.

Flexible namespace

Java defines classes and places them within a hierarchical structure that mirrors the domain namespace of the Internet. You can distribute Java applications and avoid name collisions. Java extensions, such as the Java Naming and Directory Interface (JNDI), provide a framework for multiple name services to be federated. The namespace approach of Java is flexible enough for Oracle to incorporate the concept of a schema for resolving class names in full compliance with the JLS.

Security

The design of Java bytecodes and JVM specification allow for built-in mechanisms to verify the security of Java binary code. Oracle Database is installed with an instance of Security Manager that, when combined with Oracle Database security, determines who can call any Java methods.

Standards for connectivity to relational databases

Java Database Connectivity (JDBC) and SQLJ enable Java code to access and manipulate data in relational databases. Oracle provides drivers that allow vendor-independent, portable Java code to access the relational database.

Distributed

As Java can handle the protocols like TCP/IP and UDP , we can write programs, which capture information and distribute it to the client Using Java.

Robust

Robust means strong programs that don’t crash easily.Java programs are strong and they don’t crash easily like a C or C++ program. Reasons are :

1) inbuilt Exception handling features
2) Memory Management features ( JVM Garbage collector )

Architecture Neutral

Java's byte code is not machine dependent. It can be run on any machine with any processor and any operating system.

Object oriented

Object-oriented programming (OOP) is a programming paradigm based on the concept of "objects", which may contain data, in the form of fields, often known as attributes; and code, in the form of procedures, often known as methods. In OOP, computer programs are designed by making them out of objects that interact with one another.

Multithreaded

In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system.Threads are sometimes called lightweight processes. Both processes and threads provide an execution environment, but creating a new thread requires fewer resources than creating a new process.
Multithreaded execution is an essential feature of the Java platform. Every Java application has at least one thread — or several.

Portable

Java is portable across platforms. It is possible to write platform-dependent code in Java, and it is also simple to write programs that move seamlessly across systems.

High performance

JIT (Just In Time) compiler is the part of JVM which increases the speed of execution of a java program. share on :        :  

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