Java Language Keywords

Here is a list of keywords in the Java programming language. You cannot use any of the following as identifiers in your programs. The keywords const and goto are reserved, even though they are not currently used. true, false, and null might seem like keywords, but they are actually literals; you cannot use them as identifiers in your programs.

abstract	continue	for	new	switch
assert***	default	goto*	package	synchronized
boolean	do	if	private	this
break	double	implements	protected	throw
byte	else	import	public	throws
case	enum****	instanceof	return	transient
catch	extends	int	short	try
char	final	interface	static	void
class	finally	long	strictfp**	volatile
const*	float	native	super	while

*

not used

**

added in 1.2

***

added in 1.4

****

added in 5.0

Object oriented programming

Object oriented programming is basically based on  real life programming.
In this approach there are basically two important tools:

1. Classes
and
2. Objects

classes are the blueprint and object are physical existence of classes

for example before build a house we make blueprint of house i.e. class and when we make house there is physical existence of house in earth i.e. object of class.

there are basically four features of object oriented programming:
1. Encapsulation.
2. Abstraction.
3. Polymorphism.
4. Inheritance.



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