class ReservedWords1
{
public static void main(String[] args)
{
System.out.println("main method");
m1();
}
static m1()
{
System.out.println("m1 method");
}
}
/*
Output :- CE[invalid method declaration; return type required]
Explanation :- If a method doesnot return anything then we should declare that method with
"void" return type. In Java, return type is mandatory but in C language return
type is optional and default return type is "int".
*/

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In Java, There are 53 reserved words are available to represent some meaning
or functionality such type of words are called as reserved words.

Reserved Words(53)
|
|-----Keywords(50)
|-----Reserved Literals(3) true,false,null


Keywords(50)
|
|----Used Keywords(48)
|----Unused Keywords(2) goto,const


Keywords for Data types(8)
|----byte, short, int, long, float, double, char, boolean

Keywords for Flow Control(11)
|----if, else, switch, case, default, while, do, for, break, continue, return

Keywords for Modifiers(11)
|----public, protected, private, final, static, abstract, native, synchronized, volatile, transient, strictfp

Keywords for Exception Handling(6)
|----try, catch, finally, throw, throws, assert

Class related Keywords(6)
|----class, interface, package, import, implements, extends

Object related Keywords(4)
|----new, super, this, instanceof

Void return type Keyword(1)
|----void


Unused Keywords(2)
------------------
goto:- Usage of "goto" keyword, created several problems in old languages. Hence Sun people banned this keyword in Java.
const:- We can use "final" keyword instead of "const" keyword.

Note:- By mistake if we are using these two keywords then we will compile time error.

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