Here you can find the source of parseTimeUnit(final String unit)
public static Optional<TimeUnit> parseTimeUnit(final String unit)
//package com.java2s; /*/* w w w .j av a 2 s. c o m*/ * Copyright (c) 2015 Spotify AB. * * 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.util.Optional; import java.util.concurrent.TimeUnit; public class Main { public static Optional<TimeUnit> parseTimeUnit(final String unit) { return Optional.ofNullable(unit).map(String::toUpperCase).map(TimeUnit::valueOf); } }