47 lines
1.8 KiB
Java
47 lines
1.8 KiB
Java
/*
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* Copyright 2023 The original authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dev.morling.onebrc;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.DoubleSummaryStatistics;
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import java.util.Map;
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import java.util.TreeMap;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.stream.Stream;
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public class CalculateAverage_alesj {
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public static void main(String[] args) throws Exception {
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Map<String, DoubleSummaryStatistics> stations = new ConcurrentHashMap<>();
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try (Stream<String> stream = Files.lines(Paths.get("./measurements.txt")).parallel()) {
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stream.forEach(line -> {
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String[] split = line.split(";");
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stations.computeIfAbsent(split[0], k -> new DoubleSummaryStatistics() {
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public synchronized void accept(double value) {
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super.accept(value);
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}
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public String toString() {
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return String.format("%.1f/%.1f/%.1f", getMin(), getAverage(), getMax());
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}
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})
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.accept(Double.parseDouble(split[1]));
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});
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}
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System.out.println(new TreeMap<>(stations));
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}
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}
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