Package com.google.common.primitives

Class Primitives

  • 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

      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 (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

        equals, 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