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Java Keywords



Java Keywords

Some identifiers are reserved in Java which has separate functionality and meaning such type of reserved identifiers are called reserved words/Java Keywords and these cannot be used as identifiers in java.

53 Keywords/Reserved words are there in java
50 are keywords-----------48 used keywords, 2 unused keywords (goto, const)
3 reserved literals---------- true,  false, null

Keywords for primitive data types(8)
1)byte 2)short 3)int 4)long 5)float 6)double  7)char 8) Boolean
Keywords for flow control(11)
1) if 2) else 3) switch 4)case 5)default 6)for
7) do 8) while 9) break 10) continue 11) return
Keywords for Exception Handling(6)
1)try 2)catch 3)finally 4)throw 5)throws 6)assert
Keywords for modifiers(11)
1)public 2)private 3)protected 4)static 5)abstract 6)strictfp 7)final 8)transient 9)native 10)volatile 11)synchronized
Class related key words(6)
1)class 2)interface 3)package 4)extends 5)implements 6)import
Object related key words(5)
1)new 2)instanceof 3)super 4)this
Other(1)
1)Void
Unused keywords(2)
1)const 2)goto
Reserved literals(3)
1)true 2)false 3)null
New key words in j2SE 1.5(1)
1)enum

All the key words contains only lower case alphabet symbols

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Java KeyWords

Java Keywords Some identifiers are reserved in Java which has separate functionality and meaning such type of reserved identifiers are called reserved words. Java has 54 reserved keywords. We can divide them into the following categories. Primitive types and void : 9 keywords boolean : creates a boolean variable. The only possible values are true and false and the default value is false. byte : creates a byte variable. A byte takes 8-bits and ranges from -128 to 127. char : used to create a character variable. It takes 2-bytes and it’s unsigned. The value ranges from 0 to 65,536. short : create a short variable of 2-bytes. The value ranges from -32,768 to 32,767. int : create an integer variable, takes 4-bytes and the range is from -2,147,483,648 to 2,147,483,647 long : creates a long variable, takes 8-bytes and the range is from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. float : creates a signed floating point variable using 4-bytes. double ...
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