43 lines
1.2 KiB
Java
43 lines
1.2 KiB
Java
/*
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* Copyright 2017 Hippo Seven
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hippo.util;
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/*
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* Created by Hippo on 2017/9/4.
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*/
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public class HashCodeUtils {
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private static final int X = 31;
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/**
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* <pre>{@code
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* args[0].hashCode()*31^(n-1) + args[1].hashCode()*31^(n-2) + ... + args[n-1].hashCode()
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* }</pre>
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* Returns 0 if {@code args == null}.
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*/
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public static int hashCode(Object... args) {
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if (args == null) {
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return 0;
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}
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int hash = 0;
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for (Object o : args) {
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hash = X * hash + (o != null ? o.hashCode() : 0);
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}
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return hash;
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}
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}
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