Friday, 11 January 2013

Java Keywords

Keywords in Java

Java language has reserved 49 words as keywords.


Java Keywords also called a reserved word. Keywords are identifiers that Java reserves for its own use. These identifiers have built-in meanings that cannot change. Thus, programmers cannot use these identifiers for anything other than their built-in meanings. Technically, Java classifies identifiers and keywords as separate categories of tokens. Keywords are an essential part of a language definition. There are 49 reserved keywords currently defined in the Java language and they are shown in the below table.


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


The keywords const and goto are reserved but not used. In the early days of Java,several other keywords were reserved for possible future use. 




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