Java has several basic language building blocks including identifiers, keywords, literals, whitespace, comments, separators, and operators. Identifiers name variables and can begin with letters or underscores followed by letters, digits or currency symbols. There are 49 reserved keywords that cannot be used for other purposes. Literals represent constant values like integers, floating point numbers, characters and strings. Whitespace includes spaces, tabs and newlines. There are three types of comments - single-line, multiline and documentation. Separators like semicolons terminate statements and commas separate list items. Operators specify evaluations on operands using symbols like +, -, *, / and relational operators.

1. Prepared by: Assi. Professor Sejal Jadav

2. JAVA Tokens:
Following are the basic language building blocks:
1. Identifiers
• Identifiers can begin with a letter, an underscore, or a currency
character.
• After the first character, identifiers can also include digits.
• Identifiers can be of any length.
• JavaBeans methods must be named using camelCase, and
depending on the method’s purpose, must start with set, get, is,
add, or remove.

3. 2. Keywords
• There are 49 reserved keywords currently defined in the Java
language.
• These keywords, combined with the syntax of the operators
and separators, form the definition of the Java language.
• These keywords cannot be used as names for a variable, class,
or method.

4. 3. Literals
• A constant value in Java is created by using a literal
representation of it. For example,
• Here are some literals:
98.6 ‘X’ “This is a test”
• Left to right, the first literal specifies an integer, the next is a
floating-point value, the third is a character constant, and the
last is a string.
• A literal can be used anywhere a value of its type is allowed.

5. 4.White space
• In Java, whitespace is a space, tab, or newline.
5.Comments
• As mentioned, there are three types of comments defined by
Java.
• You have already seen two: single-line and multiline.
• The third type is called a documentation comment.
• This type of comment is used to produce an HTML file that
documents your program.
• The documentation comment begins with a /** and ends with a
*/.

6. 6. Separators:
• Separators are used to inform the Java compiler of how things
are grouped in the code.
• For example, items in a list are separated by commas much
like lists of items in a sentence.
• The most commonly used separator in Java is the semicolon.
• As you have seen, it is used to terminate statements.
• List of separators ->
; , { } ( ) [ ] .

7. Operators :
• Operators means specify an evaluation to be performed on a
data (Operands).
• The operators supported by Java is as under :
+ – * / % & |
^ ~ && || ! < >
<= >= << >> >>> = ?
++ — == += -= *= /=
%= &= |= ^= != <<= >>=
>>>= . [ ] ( )