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JAVA PROGRAMMING

Lexical Issues

Whitespace

Java is a free-form language. This means that you do not need to follow any special indention rules. In Java, whitespace is a space, tab, or newline.

Identifiers

Identifiers are used for class name, method names, and variable name. An identifier may be any descrptive sequence of uppercase and lowercase, numbers, or the underscore and dollor-sign characters. They must not begin with a number.

Valid Identifiers

AvgTemp count a4 $text emp_name

Invalid Identifiers

2count high-temp emp/name

The Java Keywords

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

In addition to the keywords, Java reserves the following: true , false and null. These are values defined by Java. You may not use these words for the names of variables, classes, and so on.


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