Class Objects

java.lang.Object
com.google.common.base.Objects
@GwtCompatible public final class Objects extends Object
Helper functions that can operate on any Object.

See the Guava User Guide on writing Object methods with Objects.

Since:
2.0
Author:
Laurence Gonsalves

  • Method Details

    • equal

      public static boolean equal(@Nullable Object a, @Nullable Object b)
      Determines whether two possibly-null objects are equal. Returns:
      • true if a and b are both null.
      • true if a and b are both non-null and they are equal according to Object.equals(Object).
      • false in all other situations.

      This assumes that any non-null objects passed to this function conform to the equals() contract.

      Note: this method is now unnecessary and should be treated as deprecated; use Objects.equals(java.lang.Object, java.lang.Object) instead.

    • hashCode

      public static int hashCode(@Nullable Object @Nullable ... objects)
      Generates a hash code for multiple values. The hash code is generated by calling Arrays.hashCode(Object[]). Note that array arguments to this method, with the exception of a single Object array, do not get any special handling; their hash codes are based on identity and not contents.

      This is useful for implementing Object.hashCode(). For example, in an object that has three properties, x, y, and z, one could write: 

      public int hashCode() {
  return Objects.hashCode(getX(), getY(), getZ());
}

      Warning: When a single object is supplied, the returned hash code does not equal the hash code of that object.

      Note: this method is now unnecessary and should be treated as deprecated; use Objects.hash(java.lang.Object...) instead.