Package com.google.common.primitives
Class Primitives
- java.lang.Object
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- com.google.common.primitives.Primitives
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@GwtCompatible public final class Primitives extends java.lang.Object
Contains static utility methods pertaining to primitive types and their corresponding wrapper types.- Since:
- 1.0
- Author:
- Kevin Bourrillion
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static java.util.Set<java.lang.Class<?>>
allPrimitiveTypes()
Returns an immutable set of all nine primitive types (includingvoid
).static java.util.Set<java.lang.Class<?>>
allWrapperTypes()
Returns an immutable set of all nine primitive-wrapper types (includingVoid
).static boolean
isWrapperType(java.lang.Class<?> type)
Returnstrue
iftype
is one of the nine primitive-wrapper types, such asInteger
.static <T> java.lang.Class<T>
unwrap(java.lang.Class<T> type)
Returns the corresponding primitive type oftype
if it is a wrapper type; otherwise returnstype
itself.static <T> java.lang.Class<T>
wrap(java.lang.Class<T> type)
Returns the corresponding wrapper type oftype
if it is a primitive type; otherwise returnstype
itself.
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Method Detail
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allPrimitiveTypes
public static java.util.Set<java.lang.Class<?>> allPrimitiveTypes()
Returns an immutable set of all nine primitive types (includingvoid
). Note that a simpler way to test whether aClass
instance is a member of this set is to callClass.isPrimitive()
.- Since:
- 3.0
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allWrapperTypes
public static java.util.Set<java.lang.Class<?>> allWrapperTypes()
Returns an immutable set of all nine primitive-wrapper types (includingVoid
).- Since:
- 3.0
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isWrapperType
public static boolean isWrapperType(java.lang.Class<?> type)
Returnstrue
iftype
is one of the nine primitive-wrapper types, such asInteger
.- See Also:
Class.isPrimitive()
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wrap
public static <T> java.lang.Class<T> wrap(java.lang.Class<T> type)
Returns the corresponding wrapper type oftype
if it is a primitive type; otherwise returnstype
itself. Idempotent.wrap(int.class) == Integer.class wrap(Integer.class) == Integer.class wrap(String.class) == String.class
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unwrap
public static <T> java.lang.Class<T> unwrap(java.lang.Class<T> type)
Returns the corresponding primitive type oftype
if it is a wrapper type; otherwise returnstype
itself. Idempotent.unwrap(Integer.class) == int.class unwrap(int.class) == int.class unwrap(String.class) == String.class
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