JAVA IDENTIFIER,MODIFIERS,KEYWORDS COMMENT

Hi friends !!!  Today   i am going to tell about Java Identifiers,Java Modifiers,Java Keywords and Comments in Java which all are given below ....

Java Identifiers !!

All java components require names. Names used for classes, variables and methods are called identifiers.

Points to be remember about identifiers:

•  All identifiers should begin with a letter (A to Z or a to z ), currency character ($)     or an underscore (-).
• After the first character identifiers can have any combination of characters.
• A key word cannot be used as an identifier.
• Most importantly identifiers are case sensitive.
•  Examples of legal identifiers:age, $salary, _value, __1_value
•  Examples of illegal identifiers : 123abc, -salary

Java Modifiers !!

Like other languages it is possible to modify classes, methods etc by using modifiers. There are two categories of modifiers.

ü  Access Modifiers : defualt, public , protected, private

ü  Non-access Modifiers : final, abstract, strictfp

Java Keywords !!

The following list shows the reserved words in Java. These reserved words may not be used as constant or variable or any other identifier names.

Java comments:

Comments in Java !!

Java supports single line and multi-line comments very similar to c and c++. All characters available inside any comment are ignored by Java compiler.

public class MyFirstJavaProgram{      /* This is my first java program.     * This will print 'Hello World' as the output     * This is an example of multi-line comments.     */       public static void main(String []args){        // This is an example of single line comment     /* This is also an example of single line comment. */        System.out.println("Hello World");     } }

Using Blank Lines:

A line containing only whitespace, possibly with a comment, is known as a blank line, and Java totally ignores it.

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Posted in: Java Programming language