Here you can find the source of formatPeriod(final Period period, final boolean wrapInDurationFunction)
public static String formatPeriod(final Period period, final boolean wrapInDurationFunction)
//package com.java2s; /*/*from ww w . j av a 2 s . c o m*/ * Copyright 2017 Red Hat, Inc. and/or its affiliates. * * 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.time.Period; public class Main { public static String formatPeriod(final Period period, final boolean wrapInDurationFunction) { final long totalMonths = period.toTotalMonths(); if (totalMonths == 0) { if (wrapInDurationFunction) { return "duration( \"P0M\" )"; } else { return "P0M"; } } final StringBuilder sb = new StringBuilder(); if (wrapInDurationFunction) { sb.append("duration( \""); } if (totalMonths < 0) { sb.append("-P"); } else { sb.append('P'); } final long years = Math.abs(totalMonths / 12); if (years != 0) { sb.append(years).append('Y'); } final long months = Math.abs(totalMonths % 12); if (months != 0) { sb.append(months).append('M'); } if (wrapInDurationFunction) { sb.append("\" )"); } return sb.toString(); } }