44 lines
1.5 KiB
Java
44 lines
1.5 KiB
Java
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/*
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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 static java.util.stream.Collectors.averagingDouble;
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import static java.util.stream.Collectors.groupingBy;
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import java.io.IOException;
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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.Map;
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import java.util.TreeMap;
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import java.util.stream.Collectors;
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public class CalculateAverage {
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private static final String FILE = "./measurements.txt";
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public static void main(String[] args) throws IOException {
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Map<String, Double> measurements = Files.lines(Paths.get(FILE))
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.map(l -> l.split(";"))
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.collect(groupingBy(m -> m[0], averagingDouble(m -> Double.parseDouble(m[1]))));
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measurements = new TreeMap<>(measurements.entrySet()
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.stream()
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.collect(Collectors.toMap(e -> e.getKey(), e -> Math.round(e.getValue() * 10.0) / 10.0)));
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System.out.println(measurements);
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}
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}
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