/* * Copyright (C) 2007 Google Inc. Licensed under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law * or agreed to in writing, software distributed under the License is * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the specific language * governing permissions and limitations under the License. */ package com.github.droidfu.com.google.common.base; import java.util.Arrays; /** * Helper functions that can operate on any {@code Object}. * * @author Laurence Gonsalves */ public final class Objects { private Objects() { } /** * Determines whether two possibly-null objects are equal. Returns: * <ul> * <li>{@code true} if {@code a} and {@code b} are both null. * <li>{@code true} if {@code a} and {@code b} are both non-null and they * are equal according to {@link Object#equals(Object)}. * <li>{@code false} in all other situations. * </ul> * <p> * This assumes that any non-null objects passed to this function conform to * the {@code equals()} contract. */ public static boolean equal(Object a, Object b) { return a == b || (a != null && a.equals(b)); } /** * Generates a hash code for multiple values. The hash code is generated by * calling {@link Arrays#hashCode(Object[])}. * <p> * This is useful for implementing {@link Object#hashCode()}. For example, * in an object that has three properties, {@code x}, {@code y}, and {@code * z}, one could write: * * <pre> * public int hashCode() { * return Objects.hashCode(getX(), getY(), getZ()); * } * </pre> * * <b>Warning</b>: When a single object is supplied, the returned hash code * does not equal the hash code of that object. */ public static int hashCode(Object... objects) { return Arrays.hashCode(objects); } }