Java

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Basic Rules

1. Java is an OOP program language.All code in Java must be part of a class.
2. We delimit the beginning and end of segments of code using { and }.
3. All statements in Java must end in a semi-colon.
4. For code to run we need public static void main(String[] args)
5. Before Java variables can be used, they must be declared.
6. Java variables must have a specific type.
7. Java variable types can never change.
8. Java needs compiling so types are verified before the code even runs!
9. Functions must be declared as part of a class in Java.
   A function that is part of a class is called a “method”.
   So in Java, all functions are methods.
10. All parameters of a function must have a declared type,
    and the return value of the function must have a declared type, if do not return anything, use void.
    Functions in Java return only one value!

Advantage

Other

• Arrays in java have most 2 billion entries.