Get hash code for primitive data types
import java.lang.reflect.Array; import java.util.Arrays; /* * Copyright 2002-2007 the original author or authors. * * 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. *///Revised from springframework /** * Miscellaneous object utility methods. Mainly for internal use within the * framework; consider Jakarta's Commons Lang for a more comprehensive suite * of object utilities. * * @author Juergen Hoeller * @author Keith Donald * @author Rod Johnson * @author Rob Harrop * @author Alex Ruiz * @since 19.03.2004 * @see org.apache.commons.lang.ObjectUtils */abstractclass ObjectUtils { privatestaticfinalint INITIAL_HASH = 7; privatestaticfinalint MULTIPLIER = 31; privatestaticfinal String EMPTY_STRING = ""; privatestaticfinal String NULL_STRING = "null"; privatestaticfinal String ARRAY_START = "{"; privatestaticfinal String ARRAY_END = "}"; privatestaticfinal String EMPTY_ARRAY = ARRAY_START + ARRAY_END; privatestaticfinal String ARRAY_ELEMENT_SEPARATOR = ", "; /** * Return the same value as <code>{@link Boolean#hashCode()}</code>. * @see Boolean#hashCode() */publicstaticint hashCode(boolean bool) { return bool ? 1231 : 1237; } /** * Return the same value as <code>{@link Double#hashCode()}</code>. * @see Double#hashCode() */publicstaticint hashCode(double dbl) { long bits = Double.doubleToLongBits(dbl); return hashCode(bits); } /** * Return the same value as <code>{@link Float#hashCode()}</code>. * @see Float#hashCode() */publicstaticint hashCode(float flt) { return Float.floatToIntBits(flt); } /** * Return the same value as <code>{@link Long#hashCode()}</code>. * @see Long#hashCode() */publicstaticint hashCode(long lng) { return (int) (lng ^ (lng >>> 32)); } } Related examples in the same category
