Here you can find the source of formatDate(final java.util.Date date, final Supplier
private static String formatDate(final java.util.Date date, final Supplier<DateFormat> formatSupplier)
//package com.java2s; /*/*from w w w.j a v a 2 s . c o m*/ * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.text.DateFormat; import java.util.function.Supplier; public class Main { private static String formatDate(final java.util.Date date, final Supplier<DateFormat> formatSupplier) { final DateFormat dateFormat = formatSupplier.get(); if (dateFormat == null) { return String.valueOf((date).getTime()); } return dateFormat.format(date); } }