Java Best Practice – White Spaces

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Blank Lines
Blank lines improved readability by setting off sections of code that are locally related.
Two blank lines should always be used in the following circumstances:

1. Between sections of source file
2. Between class and interface definitions

One blank line should always be used in the following circumstances:

1. Between methods
2. Between the local variables and its first statement
3. Before a block or single line comment
4. Between logical sections inside a method to improve readability

Blank Space
Blank space should be used in the following circumstance:

• A keyword followed by parenthesis should be separated by a space.Example:

while (true) {

     …

}

Note that a blank space should not be used between a method name and its opening parenthesis.This helps to distinguish keyword from method calls

• A blank space should appear after commas in argument lists.
• All binary operators expect “.” should be separated from their operands by pace.Blank space should never separate unary operators such as unary minus, increment(“++”), and decrement(“—”) from their operands.Example:

a += c + d;

a =  (a + b) / (c * d);

while (d++ == s++) {

       n++;

}

prints(“size is ” + foo + “\n”);

• The expressions in a for statement should be separated by blank space. Example

 for (expr1; expr2; expr3) 

• Casts should be followed by blank space. Examples:

methodName1((byte) aNum, (Object) x);

methodName2((int) (cp + 5), ((int) (i+3))

                                                +1);

Java Java Best Practice 9/14/2013 07:12:00 pm