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Explain In Detail About Java Virtual Machine
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J means Java
Java's greatest power is platform independence. It is quite significant to observe that for producing bug free software in Java is simpler when compared to that in C or C++. The ultimate motto behind the creation of Java was to keep it simpler or easy to write and maintain. Although it has some ancestral features of C, the Java creators removed some of the language's most troublesome features. Sometimes even C/C++ programs are difficult to maintain and understand and thus it results in untraced programming errors. Let us see the few enhancements over here:
There is always fixed size in all of Java's primitive data types. For instance, in Java an int is always 32 bits, and it does not matter what is below that.
The program is prevented from writing by automatic run-time bounds checker reading or writing after the end of an array.
A Boolean result is returned by all test conditions. There are some common C/C++ programming languages like (x=3) and they are just detected at compile time, removing a complete class of bugs.
Apart from that Java is considered an object-oriented language permitting software for encapsulating functions and data types that are new and thereby transforming them into new logical units called classes.
Inheritance, Encapsulation, and Polymorphism are in demand and in the built in class libraries they are heavily used. Replacing the multiple inheritance by eliminating it, the concept of inheritance is made easier in Java. There are lots advanced and new features that are not found in C++, and they are:
Dynamic memory management is made easier because of Automatic garbage collection and it removes memory leaks.
Multi threaded applications written in Java is supported by built-in language and is easily portable when compared to others written in other languages by offering a thread that is consistent and synchronize API across various operating systems.
For Java the virtual machine is not unique and it comes up from the ideas of two simpler ideas. Everywhere the work of computer programmers at first would be comparatively easier, in every system if a single processor architecture was utilized in every system. At the end, one processor simulates over the other and offers sufficient computing power, often reasonable.
Both a new and a mythical processor is designed by Java creators on which most of the programs written in Java would run. It got the name Java Virtual Machine because of the processors that did not exist. Javabytecodes is the instruction set recognized by the virtual machines.
As there is no physical existence of hardware in the Java processor, it was required to simulate it in software. The first Java Virtual Machine (JVM) was developed by Sun at the end. For translating every Java bytecode, the first bytecode interpreter used was JVM.
Every time it is received from the memory, a bytecode is retranslated by and interpreter. The execution of this process is reduced in speed. For instance have a look into the effect of reinterpretation on a simple for loop and its inner statements.
Java programing language having a program written is for compiling into a set of bytecodes. By a JVM, those bytecodes are then executed and loaded. If other Java classes are called by the program there will be a load of bytecodes with respect to that classes. It will also have dynamic links, and executions. There are some libraries intended for constructing any standard Java executin environment, and it is similar to C standard Library as a part of ANSI C standard.
For executing the Java bytecodes, the main thing to be considered is its portability. On any processor, the execution of Java bytecodes is compulsory.
For encouraging and promoting application portability, there are several standard runtime platforms defined by Sun. These are some of the application environments defined:
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