Here you can find the source of isBigDecimal(Number n)
private static boolean isBigDecimal(Number n)
//package com.java2s; /*// w w w .ja v a2 s . c o m * Copyright 2006-2014 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. */ import java.math.BigDecimal; public class Main { /** * Finds out if n represents a BigInteger * * @return true if n is instanceOf BigInteger or the literal value can be * evaluated as a BigInteger */ private static boolean isBigDecimal(Number n) { if (n instanceof BigDecimal) { return true; } try { new BigDecimal(String.valueOf(n)); return true; } catch (NumberFormatException e) { return false; } } }