ObjectsCompat

Kotlin |Java

open class ObjectsCompat

kotlin.Any
↳	androidx.core.util.ObjectsCompat

This class consists of static utility methods for operating on objects.

Summary

Public methods
open static Boolean	`equals(@Nullable a: Any?, @Nullable b: Any?)` Returns `true` if the arguments are equal to each other and `false` otherwise.
open static Int	`hash(@Nullable vararg values: Any!)` Generates a hash code for a sequence of input values.
open static Int	`hashCode(@Nullable o: Any?)` Returns the hash code of a non-`null` argument and 0 for a `null` argument.
open static String?	`toString(@Nullable o: Any?, @Nullable nullDefault: String?)` Returns the result of calling `toString` on the first argument if the first argument is not `null` and returns the second argument otherwise.

Public methods

equals

open static fun equals(
    @Nullable a: Any?, 
    @Nullable b: Any?
): Boolean

Returns true if the arguments are equal to each other and false otherwise.

Consequently, if both arguments are null, true is returned and if exactly one argument is null, false is returned. Otherwise, equality is determined by using the equals method of the first argument.

Parameters
`a`	Any?: an object
`b`	Any?: an object to be compared with `a` for equality

Return
`Boolean`	`true` if the arguments are equal to each other and `false` otherwise

See Also

Object#equals(Object)

hash

open static fun hash(@Nullable vararg values: Any!): Int

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[]).

This method is useful for implementing Object#hashCode() on objects containing multiple fields. For example, if an object that has three fields, x, y, and z, one could write:

@Override public int hashCode() {
          return ObjectsCompat.hash(x, y, z);
      }

Warning: When a single object reference is supplied, the returned value does not equal the hash code of that object reference. This value can be computed by calling hashCode(Object).

Parameters
`values`	Any!: the values to be hashed

Return
`Int`	a hash value of the sequence of input values

See Also

Arrays#hashCode(Object[])

hashCode

open static fun hashCode(@Nullable o: Any?): Int

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

Parameters
`o`	Any?: an object

Return
`Int`	the hash code of a non-`null` argument and 0 for a `null` argument

See Also

Object#hashCode

toString

@Nullable open static fun toString(
    @Nullable o: Any?, 
    @Nullable nullDefault: String?
): String?

Returns the result of calling toString on the first argument if the first argument is not null and returns the second argument otherwise.

Parameters
`o`	Any?: an object
`nullDefault`	String?: string to return if the first argument is `null`

Return
`String?`	the result of calling `toString` on the first argument if it is not `null` and the second argument otherwise.