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JAVA ASSIGNMENT HELP
JAVA is a programming language of computers.This is also known as structured and object oriented language.In addition to that, it is also called a class-based and concurrent language.It urges the customers to write once and run away (WORA). It means that Java gathers data once for all, you do not need to compile data again and again in JAVA.There is a general misconception that C++ and JAVA are intended for the same purpose, but the case is otherwise.Below is the detailed discussion that gives a comparison between JAVA and C++.
Comparison of Java and C ++
The difference between the C ++ and Java languages can be found, respectively, from the birth of history.
C ++ is made to further expand the C as indicated in the name. A procedural programming language was designed to be both efficient execution. Static data type checking object-oriented programming, exception handling support, RAII, generic programming. Figure C ++ Standard Library,and algorithms have been added.
Java is mounted on the first consumer electronics made to support a network computing. Since safety has also highly portable running on a virtual machine,it has a vast amount of library that was completely abstracted from the lower platform. Java does not use the same syntax as the direct compatibility with C. Many people are easy to use to achieve the designed because it is an easy-to-understand language.
The difference between the two languages occurred as a result of different trade-offs in principle, policy, design due to the differences in purpose of development.
|C source code and backwards compatibility||No other languages and source code compatibility,|
|Direct system call library available||Java uses the Native Interface|
|Possible low-level system access||Runs on a virtual machine that is secured|
|Optional automatic bounds checking||Automatic boundary should always check|
|Unsigned (unsigned) operational support||Prefer not support unsigned arithmetic|
|Passing parameters passed by reference or by value parameter||Always passed by value parameters. The reference value may be used for the object as a parameter. You can change the contents of the reference target is, the reference value itself cannot be changed; After the method call, which it will not change the reference object to another object.|
|Explicit memory management and garbage collection must be used to further the library||Always automatic garbage collection|
|Allow explicit data type override||Strict safety in data types|
|The C ++ standard library supports up to an appropriate range||A vast amount of library|
|Operator Overloading||Operators cannot be redefined|
C ++ is a powerful but complicated and difficult language, and is suitable for performance-oriented applications and libraries. Java is usually easy to learn, it is difficult to expect a full-function platform use, or the perfect performance advantage with it.
Features of the language
Java syntax is a context-free grammar that can interpret a simple LALR parser. C ++ analysis is a bit more complicated. For example, Foo <1> (3); Formula, but the case where it is determined that the continuously variable will here interpret the statement, the Formula will generate a class if an object name for the template.
C ++ may be constant, variable, a function of the namespace level. In Java, all constants, variables, functions must necessarily belong to the class or interface.
Constant in C ++ is stated that ‘read-only’ data into conceptual and applied to the type. Final in Java indicates that they can not be re-assigned to variables. Let’s have a look at the formula difference between JAVA and C++.
|constant Rectangle r;||final Rectangle r = new Rectangle ();|
|r.x = 5; // Wrong, r is a constant Rectangle||r.x = 5; // Correctness, r is still the same, and refer to a Rectangle object.|
C ++ is to allow implicit casts between basic data types, can also be implicitly cast to a user-defined data types. In Java, it allows an implicit cast to only a wide range between basic types, in other cases is possible only through an explicit cast all the cast.
This effect is shown in the condition required data type called (if, escape condition of the while and for). Because Java is implicitly cast to, boolean code to refine, such as if (a = 5) generates a compile error. The C ++ compiler generates the majority of days warning.
When you pass an argument to the function, C ++ supports both the call and the reference value method call. In Java factor, it is always transmitted to the calling value. 1
Built-in data type in Java has a certain size and scope determined by the virtual machine.While the minimum range of C ++ is determined, the accurate representation of the size and the range may vary depending on the support of the working platform.
For example, Java’s character (char) is a 16-bit Unicode system is composed of a sequence of such character strings. C ++ supports both single-byte characters and full-width characters, but the actual size of this character is dependent on the platform being used.The floating-point operations in C ++ is platform dependent. Java guarantees the same result on different platforms, respectively. However, there may be a reduction in performance.
The pointers in C ++ can be performed using a memory address. Java has no pointer-referenced with the array, but a reference to the object, a direct access to the memory address is permitted. C ++, but can also create a pointer to a pointer, a reference to the Java function only provides access to the object.
The pointer can point to a C ++ function or method (a function pointer or functor). Java is used in the reference or references to the interface of the object in the same mechanism.
C ++ can be used for resource management RAII. This technology allows managing the memory and system automatically in response to the disappearance of the object. Further, the garbage collection to automatically manage memory. However, an explicit release is required after use of system resources for other than the memory (windows, ports, threads).
C ++ programmers have to do operator overloading. Java is used in the connection string, the “+” and “- =” only just it is overloaded.
Java has a standard API that supports the reflection and dynamic loading.
Java has the generic type that supports generic programming. C ++ has a template. A template allows more extensive support.
Both Java and C ++ distinguishes the basic data types (also referred to as primitive data type or the built-in data types) and the user-defined data types (hybrid). In the Java basic data types, and only the meaning of a value, user-defined data types are only meant to see. In C ++, but all have the meaning of the data type value, it may also make a reference (pointer) on any data type it is possible to manipulate the object by reference.
The C ++ supports multiple inheritance of classes. In Java, the class can be only one class can be inherited, but to implement a plurality of interfaces (that is, multiple inheritance for the type of support, but can only be implemented for a single inheritance).
The interfaces and classes in the Java concept is explicitly distinguished. To ensure that acts as the interface in C ++ and Java is when you apply multiple inheritance and pure virtual function to the class.
Java supports multi-threading in the language and standard library level. Synchronized keyword, in Java, support the easy and safe mutex. Whereas C ++ is similar to the one using the library there is no general model for a multi-threaded memory
Java supports automatic garbage collection. Memory management in C ++ is typically a smart pointer. In C ++ it can be used for garbage collection, in general, are not used well.
The C ++ is to allocate memory blocks in any size. Java is only a way to allocate memory to create an object. (If the Java programmer is creating a byte array to allocate memory in any size).Java and C ++ are different practices in resource management. Java can mainly be played only on relying on garbage collection does not know what is the recent memory of the other resources. However, C ++ is primarily relying on customs called RAII (Resource Acquisition Is Initialization). This appears below many differences between the two languages.
In C ++, by assigning the objects in the stack area of the composite type it is also used in a manner that leaves the area destroyed. The hybrid Java heap area is always assigned only to the collection and the Garbage Collector.
C ++ has a destructor. Java has a terminator (Finalizer). The objective of JAVE is to destroy, but with notable difference. The object of the C ++ destructor is implicitly (in the case of a stack variable region) or explicitly run when deallocated objects. A destructor is run synchronously when the object is deallocated. Allocation of objects in the Java garbage collector to release the implicit processing. The Java object is finally concluded shortly after the call asynchronously more time you have access to that object. In most cases there is no need terminator. The termination is necessary only for the objects that have resources (mainly external resources JVM) and that must be cleaned before being deallocation. In order to secure synchronously on the Java explicitly deallocate resources should be used to try finally.
C ++ has a problem, the pointer (dangling pointer, a pointer which points to an object that is already extinguished). If you choose to use stray pointers program, it will result in an error. Java’s garbage collector does not see the object being destroyed not because a problem occurred, but because of some technical issues.
In C ++, it is possible to create an object without initializing (has a garbage). Java is to force the default initialization (which is initialized to zero, and so on).
C ++ can have not been accessible to the reference assigned to the memory object. This approach can not object causes a memory leak might not be destroyed. On the other hand, the object does not disappear until the garbage collector in Java is inaccessible objects. Garbage collection of Java is the most prevent a memory leak, but still in some situations, a memory leak problem may occur. 2
Java, C ++ is weak relative to the other resources for the leakage of non-memory.
The Java standard library has quite huge compared to C ++. A standard library of C ++ provides only a relatively general factors such as string, container, input and output stream. Java SE standard library provides all of the computer network, the graphical user interface, XML processing, logging, database access, cryptography, and other factors. This add-on is used mainly for a third party (third-party) libraries without the need to implement their own C ++.
C ++ is a great language, and the most backward compatibility C. In the C ++ API of the operating system, such as the C library it can be used directly. In the Java standard library provides a wealth primarily to allow most cross-platform environment, many features as possible into platform-specific libraries. However, if you want direct access to the operating system or the hardware features in Java It should be used for Java Native Interface.
C ++ are usually compiled directly into machine and operating system it is running. Java is usually being compiled into bytecode, the Java virtual machine is running interpreted or compiled into machine code by the JIT compiler, and then run the way. Theoretical dynamic recompilation is applicable to both, and is particularly useful in the Java language. However, the current dynamic recompilation was not nearly obsolete.
Rather free expression of C ++ (no array bounds checking unused pointers, data type conversion) has devised a runtime error checking at compile reliable thanks to me there is a risk. Related to a buffer overflow error, there is a segmentation fault. However, if you use a high-level abstraction that provides STL (vector, lists, maps) you can avoid the error. In Java, this error does not occur even been caught in a Java virtual machine and reported to the application, with the exception of processing forms.
Java requires a boundary scan clearly arranged for access outside the bounds of the array. This will reduce the instability, but generally gives an adverse effect on the running speed. In some cases, the compiler analyzes all these problems are sometimes unnecessary border checks be removed. C ++ does not have any bounds checking of the array does not act on the access is outside the range of the array. If such a collection of the C ++ Standard Library of the vector selectively provides a boundary check. In summary, the Java array is “always safe, rigorously inspected and, if possible quickly”, the C ++ array is “always faster, without checking at all, the risk that potential.”
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