Java Keywords

Java defines a special set of identifiers called keywords that represent fundamental coding constructs.
Following is a list of keywords that are reserved in Java:

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

Keywords required for Java SE 8

Table 6.2 Java keywords and reserved words that cannot be used as names for Java variables

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

All Java keywords are defined for a reason. Most of them provide some functionality within the Java programming language, while others serve as placeholders intended to keep you from using a particular word as an identifier.