Typographical

Identifier Type	Examples
Package	com.google.inject, org.joda.time.format
Class or Interface	Timer, FutureTask, LinkedHashMap, HttpServlet
Method or Field	remove, ensureCapacity, getCrc
Constant Field	MIN_VALUE, NEGATIVE_INFINITY
Local Variable	i, xref, houseNumber
Type Parameter	T, E, K, V, X, T1, T2

Grammatical

Interfaces are named like classes

Collection
Comparator
Runnable
Iterable
Accessible

Because annotation types have so many uses, no part of speech predominates
```
BindingAnnotation
Inject
ImplementedBy
Singleton
```
Methods that perform some action are generally named with a verb or verb phrase
```
append
drawImage
```
Methods that return a boolean value usually have names that begin with the word is or has
```
isDigit
isProbablePrime
isEmpty
isEnabled
hasSiblings
```
Methods that return a non-boolean function or attribute of the object on which they’re invoked are usually named with a noun, a noun phrase, or a verb phrase beginning with the verb get
```
size
hashCode
getTime
```
The form beginning with get is mandatory if the class containing the method is a Bean
```
getAttribute
setAttribute
```
A few method names deserve special mention. Methods that convert the type of an object, returning an independent object of a different type, are often called toType
```
toString
toArray
```
Methods that return a view (Item 5) whose type differs from that of the receiving object are often called asType
```
asList
```
Methods that return a primitive with the same value as the object on which they’re invoked are often called typeValue
```
valueOf
of
getInstance
newInstance
getType
newType
```
Grammatical conventions for field names are less well established and less important than those for class, interface, and method names, as well-designed APIs contain few if any exposed fields