Improving coding style into classes

Class and Interface declarations should be organized in the following manner: 
1. Class/Interface documentation. 
2. class or interface statement. 
3. Class (static) variables in the order public, protected, package (no access modifier), private. 
4. Instance variables in the order public, protected, package (no access modifier), private.
5. Constructors. 
6. Methods (no specific order). Reduce complexity by making the location of each class element predictable. 


Imported classes should always be listed explicitly.
import java.util.List; // NOT: import java.util.*; 
import java.util.ArrayList; 
import java.util.HashSet; 
Importing classes explicitly gives an excellent documentation value for the class at hand and makes the class easier to comprehend and maintain. Appropriate tools should be used in order to always keep the import list minimal and up to date.