What is Java?
Java is a computer programming language. It enables programmers to write computer instructions using English-based commands instead of having to write in numeric codes. It’s known as a high-level language because it can be read and written easily by humans. Like English, Java programming language has a set of rules that determine how the instructions are written. These rules are known as its syntax. Once a java program has been written, the high-level instructions are translated into numeric codes that computers can understand and execute.
It is difficult to provide a single reason as to why Introduction to Java programming has become so ubiquitous. However, the language's major characteristics have all played a part in its success, including the following components:
Programs created in Java programming Language offer portability in a network. The source code is compiled into what Java calls bytecode, which can be run anywhere in a network on a server or client that has a Java virtual machine (JVM). The JVM interprets the bytecode into code that will run on computer hardware. In contrast, most programming languages, such as COBOL, C++, Visual Basic or Smalltalk, compile code into a binary file. Binary files are platform-specific, so a program written for an Intel-based Windows machine cannot on run a Mac, a Linux-based machine or an IBM mainframe. The JVM includes an optional just-in-time (JIT) compiler that dynamically compiles bytecode into executable code as an alternative to interpreting one bytecode instruction at a time. In many cases, the dynamic JIT compilation is faster than the virtual machine interpretation.
The code is robust. Unlike programs written in C++ and some other languages, Java objects contain no references to data external to themselves or other known objects. This ensures that an instruction cannot contain the address of data storage in another application or in the operating system itself, either of which would cause the program and perhaps the operating system itself to terminate or crash. The JVM makes a number of checks on each object to ensure integrity.
Java is object-oriented. An object can take advantage of being part of a class of objects and inherit code that is common to the class. Objects are thought of as "nouns" that a user might relate to rather than the traditional procedural "verbs." A method can be thought of as one of the object's capabilities or behaviors. Being object-oriented is relatively common in today's programming landscape, but back in 1996, only a handful of languages were implementing object-oriented concepts and design patterns effectively. The ability to develop with a language created from the ground up with object-orientation as its explicit purpose made Java an exciting platform upon which to program.
Applet offers flexibility. In addition to being executed on the client rather than the server, a Java applet has other characteristics designed to make it run fast.
Developers can learn Java quickly. With syntax similar to C++, Java is relatively easy to learn, especially for those with a background in C.