java.util.Objects的主要方法

1.public static boolean equals(Object a, Object b)

2. public static int hashCode(Object o)

Returns the hash code of a non-null argument and 0 for a null argument.

3.public static int hash(Object... values)

Generates a hash code for a sequence of input values. The hash code is generated as if all the input values were placed into an array, and that array were hashed by calling Arrays.hashCode(Object[]).

4.public static <T> int compare(T a, T b, Comparator<? super T> c)

5.public static <T> T requireNonNull(T obj)