Here you can find the source of toBigDecimal(final Number number)
private static BigDecimal toBigDecimal(final Number number)
//package com.java2s; /**//from ww w . ja va 2 s.com * Copyright Notice * * This is a work of the U.S. Government and is not subject to copyright * protection in the United States. Foreign copyrights may apply. * * 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. */ import java.math.BigDecimal; public class Main { private static BigDecimal toBigDecimal(final Number number) { if (number instanceof Integer || number instanceof Long) { return new BigDecimal(number.longValue()); } else if (number instanceof Float || number instanceof Double) { return new BigDecimal(number.doubleValue()); } else { throw new RuntimeException( "Unexpected data type passed in to toBigDecimal (" + number.getClass() + ")"); } } }