Package com.google.common.primitives

Class Primitives

java.lang.Object

com.google.common.primitives.Primitives

@GwtIncompatible
public final class Primitives
extends java.lang.Object

Contains static utility methods pertaining to primitive types and their corresponding wrapper types.

Since:

1.0

Method Summary

Modifier and Type	Method	Description
static java.util.Set<java.lang.Class<?>>	allPrimitiveTypes()	Returns an immutable set of all nine primitive types (including void).
static java.util.Set<java.lang.Class<?>>	allWrapperTypes()	Returns an immutable set of all nine primitive-wrapper types (including Void).
static boolean	isWrapperType(java.lang.Class<?> type)	Returns true if type is one of the nine primitive-wrapper types, such as Integer.
static <T> java.lang.Class<T>	unwrap(java.lang.Class<T> type)	Returns the corresponding primitive type of type if it is a wrapper type; otherwise returns type itself.
static <T> java.lang.Class<T>	wrap(java.lang.Class<T> type)	Returns the corresponding wrapper type of type if it is a primitive type; otherwise returns type itself.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

allPrimitiveTypes

public static java.util.Set<java.lang.Class<?>> allPrimitiveTypes()

Returns an immutable set of all nine primitive types (including void). Note that a simpler way to test whether a Class instance is a member of this set is to call Class.isPrimitive().

Since:

3.0

allWrapperTypes

public static java.util.Set<java.lang.Class<?>> allWrapperTypes()

Returns an immutable set of all nine primitive-wrapper types (including Void).

Since:

3.0

isWrapperType

public static boolean isWrapperType(java.lang.Class<?> type)

Returns true if type is one of the nine primitive-wrapper types, such as Integer.

See Also:

Class.isPrimitive()

wrap

public static <T> java.lang.Class<T> wrap(java.lang.Class<T> type)

Returns the corresponding wrapper type of type if it is a primitive type; otherwise returns type itself. Idempotent.

     wrap(int.class) == Integer.class
     wrap(Integer.class) == Integer.class
     wrap(String.class) == String.class
 

unwrap

public static <T> java.lang.Class<T> unwrap(java.lang.Class<T> type)

Returns the corresponding primitive type of type if it is a wrapper type; otherwise returns type itself. Idempotent.

     unwrap(Integer.class) == int.class
     unwrap(int.class) == int.class
     unwrap(String.class) == String.class