» » Top 10 uses of Java Keywords

Keyword:

  • Keywords are predefined identifiers available directly throughout the JVM.
  • They have a special meaning inside java source code and outside of comments and strings.
  • For Example : public, static, void

Rules:

  • Keywords can not be used as user defined identifier by the programmer either for variable or method or class names, because keywords are reserved for their intended use.
  • All characters in keyword must be used in lower case.

Need of keywords:

  • Basically keywords are used to communicate with compiler and JVM about the operation we perform in java application.
  • In java we perform 10 different operations using keywords
  • They are:
  1. Creating Java file
  2. Storing data temporary
  3. Creating memory locations
  4. Controlling calculations
  5. Setting accessibility permissions
  6. Modifying default properties
  7. Object representation
  8. Establishing relations between classes
  9. Grouping classes
  10. Handling user mistakes
  • In java we have 50 keywords to perform all above 10 operations
  • Among them 47 introduced in java 1.0
  • In Java 1.2 new keyword "strictfp" was added.
  • In Java 1.4 new keyword "assert" was added
  • In Java 5 new keyword "enum" was added
  • Among 50 keywords 2 keywords are reserved words they can not be used in java program, because they defined but they are not implemented , those two are,
  1. goto
  2. const
     

1.Java Files

1.class
2.interface
3.enum

2.Data Types

4.byte
5.short
6.int
7.long
8.float
9.double
10.char
11.boolean
12.void

3.Memory Location

13.static
14.new

4.Control Statements

1.conditional

15.if
16.else
17.switch
18.case
19.default

2.loop

20.while
21.do
22.for

3.transfer

23.break
24.continue
25.return

5.Accessibility Modifiers

26.private
27.protected
28.public

6.Modifiers

28.static // used as modifier and class level memory allocation
29.final
30.abstract
31.native
32.transient
33.volatile
34.synchronized
35.strictfp

7.Object Representation

36.this
37.super
38.instanceof

8.Inheritance Relationship

39.extends
40.implements

9.Package

41.package
42.import

10.Exception Handling

43.try
44.catch
45.finally
46.throw
47.throws
48.assert

11.Unused keywords

49.const
50.goto


Default literals:

1.referenced literal
  ->null
2.boolean literals
->true
->false

Instance Of Java

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2 comments for Top 10 uses of Java Keywords

  1. Thank you so much.very use full for java freshers

    ReplyDelete
  2. Thank you so much for the Java tips. You really give me brickshelf inspiration that I can use.

    ReplyDelete

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