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Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc.

Some features include Object Oriented, Platform Independent, Robust, Interpreted, Multi-threaded. It’s compiler generates an architecture-neutral object file format, which makes the compiled code to be executable on many processors, with the presence of Java runtime system. Java uses Just-In-Time compiler to enable high performance. Just-In-Time compiler is a program that turns Java bytecode, which is a program that contains instructions that must be interpreted into instructions that can be sent directly to the processor.

It is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time. When Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual Machine JVM on whichever platform it is being run. Object is a runtime entity and it’s state is stored in fields and behavior is shown via methods. Methods operate on an object's internal state and serve as the primary mechanism for object-toobject communication. Constructor gets invoked when a new object is created. Every class has a constructor. If we do not explicitly write a constructor for a class the java compiler builds a default constructor for that class.

Variables, methods and constructors which are declared protected in a superclass can be accessed only by the subclasses in other package or any class within the package of the protected members' class. Java provides access modifiers to set access levels for classes, variables, methods and constructors. A member has package or default accessibility when no accessibility modifier is specified. The String class is immutable, so that once it is created a String object cannot be changed. Since String is immutable it can safely be shared between many threads ,which is considered very important for multithreaded programming.

Basic example for java programming is as follows :

  1. class PalindromeExample{  
  2.  public static void main(String args[]){  
  3.   int r,sum=0,temp;    
  4.   int n=454;//It is the number variable to be checked for palindrome  
  5.   
  6.   temp=n;    
  7.   while(n>0){    
  8.    r=n%10;  //getting remainder  
  9.    sum=(sum*10)+r;    
  10.    n=n/10;    
  11.   }    
  12.   if(temp==sum)    
  13.    System.out.println("palindrome number ");    
  14.   else    
  15.    System.out.println("not palindrome");    
  16. }  
  17. }  

Output:

palindrome  number

 

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