Assignment and Homework help in JAVA

JAVA :

 

Java is a programming language that was developed by Sun Microsystems. It is similar to C++, but eliminates all the features which results in common programming errors. The java source code files having .java extension are compiled into bytecode having .class extensions which are executed by java interpreter. Java compiled code can run on any computer because the java run time environment and interpreters, known as JVM (Java Virtual Machines) are available for most of the OS.

Some Features of Java are as follows:

a)       Platform Independent:  The concept of Write Once and Run Anywhere is a very important feature of Java. A compiled java code can run on any computer/platform required the platform must contain JVM.

 

 b)       Simple: Java has been developed by taking out best from various other languages primarily C++ and C. Since pointers and memory management are error prone, hence these have either eliminated or have are being automatically handled by the Java environment rather than the programmer. Since Java is mostly derived from C++ which is known to most of the developers, hence the look and feel of Java seems to be quite easy and convenient.

c)      Object Oriented:  Though Java is similar to C++, it is completely an independent language which is designed to be object oriented from the beginning till the end. In the object oriented programming the data is treated as the objects to which the methods can be applied. The basic unit of execution in Java is class. No code is written outside the class. Advantages of OOPs include: extensibility, reusability of the code, and dynamic applications.

 

d)     Robust: Java is considered to be a very robust language. Exception handling is in built, local variables mist be initialized, and there is strong type checking.

 

e)      Distributed: The very commonly used internet protocols such as HTTP and FTP and various calls for network access are built into Java. The internet programmers can easily call on the functions via supplied libraries and would also be able to access files on internet very easily.

 

f)       Portable: By having an interpreter for Java Virtual Machine to any OS or computer hardware, the developer is assured that all the code which has been compiled for it will certainly run on that system. This is the basis of Java portability. Another main feature which Java has to guarantee the portability is by creating a single standard for data size irrespective of the OS platform or the processor.

 

g)      Dynamic: Java is considered to be dynamic. By connecting to the internet Java has basically access to thousands of the computers and other programs. While execution of a program Java can load classes from the local hard drive or from other computers on the local area network or also from the computer which is somewhere on the internet.

 

h)    Secure: Java has in built capabilities to ensure that there are no violations of security. Let us consider a Java program running on a computer which is on LAN and in also connected to internet. Java not only has dynamic and distributed computing environment but it can also bring in classes it needs for execution of the program during the runtime. This capability of the applets or the classes to come from any unknown location and then execute automatically on the local computer sound dangerous to concerned computer administrator because of hackers, viruses etc. Java puts in great effort to address such security issues by having a rigorous multilevel security system.

·         Firstly, during the compile time, the memory allocation and pointers are removed thereby removing the tools via which the system hacker could get access to various other system resources. Memory allocation is avoided until the runtime.

·         Though the Java compiler always produces the correct Java code, still there is a possibility of code being tampered between the compilation and runtime. Java guards this by using the bytecode verifier. The bytecode verifier checks the following:

a)      Forge the pointers

b)      Incorrectly access the classes

c)      Violate the access restrictions.

d)     Use incorrect parameters of bytecode

e)      Overflow or underflow an operand stack

f)       Use illegal data conversions  etc.     Secure: 

Online Homework help in JAVA

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