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

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.