Reserve words in java

Reserve Words in java.

Reserve Words There are few words in java which are reserved for some meaning or functionality, these words in java called Reserved Worlds.

There are 53 reserve words in java.

Reserve Words (53)

Reserved Keywords (50)

Reserved Literals (3)

true Unused keywords (2)

Used keywords (48)

false

null

goto

const

Keywords for Modifers(11) -

public private protected abstract static final strictfp(1.2) synchronized native transiante volatile

Keywords for flow Control (10) -

if else switch case default break continue for while do

Keywords for Exception Handling (6) -

try catch finally throw throws assert(1.4)

Keywords for DataTypes(8)

Keywords for class (6)

Keywords for Objects(4)

-

Keywords for Method(2)

-

-

-

byte short int long float double char boolean

class extends interface implements package import

new instanceof this super

- enum keyword introduced in 1.5 ver. of Java

void return

goto:- As use of goto keywords creates several problem in old programing language ,hence SUN people decide not to used “goto” keywords and band it in java. const :- use final instead of const.

Note:- In java return type is mandatory for the methods , if method doesn’t return anything than its return type is void.

BUT In c-language return type is optional and default return type is int.

Goto and const keyword is unused keyword if we try to use it than we will get CE. enum- we use enum to define a group of named constant.

Ex: enum month { jan,feb,mar,…..dec; }

Conclusion :(1). All reserve words in java only contain lower case-alphabets symbols.

(2). In java we have only new keyword but not delete keyword because in java destruction of unused object is responsibility of java Garbage collector.

Things to aware: strictfp but not strictFp. instanceof but not instanceOf extends but not extend implements but not implement import but not imports synchronized but not synchronize const but not consant