Here you can find the source of divide(Number a, Number b, Class
public static <T extends Number> T divide(Number a, Number b, Class<T> cl)
//package com.java2s; /*//from w ww.j a va2s . co m * Copyright (c) 2016 Alexander Gr?n * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ public class Main { public static <T extends Number> T divide(Number a, Number b, Class<T> cl) { return convert(a.doubleValue() / b.doubleValue(), cl); } @SuppressWarnings("unchecked") public static <T extends Number> T convert(Number n, Class<T> cl) { if (cl == Double.class) { return (T) new Double(n.doubleValue()); } else if (cl == Integer.class) { return (T) new Integer(n.intValue()); } else if (cl == Float.class) { return (T) new Float(n.floatValue()); } else if (cl == Long.class) { return (T) new Long(n.longValue()); } else if (cl == Short.class) { return (T) new Short(n.shortValue()); } else if (cl == Byte.class) { return (T) new Byte(n.byteValue()); } return null; } }