Learn Java Chapter 1

Download java

Java is a object oriented programming language developed by Sun Microsystem of USA in 1991.The goal is to make a simple language ,portable and reliable.Java team included existing programming features like C and C++ but they removed number of features of C and C++ that they consider aas source of problems and thus made java really simple,portable,reliable.Java has different milestone from90's.Java include many features their aim is to design a language which could offer solution to some of the problems encountered in modern programming.

1. Dynamic and Extensible
2. Perfomance
3. Distributed
4. secured
5. Object-Oriented
6. Compile and Interpreted
7. Simple
8. Multithreaded
9. Intractive

There are some features that differ from C and C++ let's look
JAVA and C:

• Java does not contain the data types struct and union
• Java does not support explict pointer type
• we cannot use #define,#include statements
• Java add new operator such as instanceof and >>>
• Java adds Break and Continue statement

JAVA and C++:

• Java does not have pointers
• Java does not support operator overloading
• Java does not have template classes
• We cannot use #include statements
• We have to use finalize()function instead of destructor

Java is a object-oriented programming language.Java can develop 2 types of programs

• Standalone
• Web applets

Stand alone are written in java to carry out certain task on a local computer.We can execute the program in 2 steps

• Compling the bytecode using javac program name.java
• Executing the bytecode program java program name

Now we can write a simple program to print sharealltricks


class Program1
{
public Static void main(String args[])
{
System.out.println("Sharealltricks"); // Display the string.
}
}

NOTE:

• Java is case sensitive
• Class name and the file name should be same Here the file name should be given as Program1
  

Class Declaration:

Class Program1
We must declare a class it is an object oriented language and hence all must be declare inside the class.
Class definition begins with brace [{ ] and ends with a closing [}] in the case of c++ we use [;] semicolon

Main Line:

This is similar to main() function in c++ Every java program must include the main() method.This is the atarting point for the interpreter to begin the execution java can have more number of classes but it 1 of them should be a main.
"public static void main(String args())"
Finally the System.out.print it is the output statement this is similar to cout<sharealltricks statement