回答編集履歴
2
ファイルパスを変更
test
CHANGED
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@@ -2,9 +2,7 @@
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2
2
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3
3
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public static void main(final String[] args) throws Exception {
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4
4
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5
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-
final String filePath = "C:\eclipse_workspace\my-project\src\sample\data.txt";
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6
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-
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7
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-
try (Stream<String> lines = Files.lines(Paths.get(
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5
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+
try (Stream<String> lines = Files.lines(Paths.get("kaikei.txt"))) {
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8
6
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9
7
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Map<String, Integer> summary = lines.map(line -> {
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10
8
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1
mainメソッドを追加
test
CHANGED
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@@ -1,16 +1,22 @@
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1
1
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```Java
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2
2
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3
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-
t
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3
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+
public static void main(final String[] args) throws Exception {
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4
4
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5
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-
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5
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+
final String filePath = "C:\eclipse_workspace\my-project\src\sample\data.txt";
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6
6
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7
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-
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7
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+
try (Stream<String> lines = Files.lines(Paths.get(filePath))) {
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8
8
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9
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-
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9
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+
Map<String, Integer> summary = lines.map(line -> {
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10
10
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11
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-
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11
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+
String[] split = line.split(",");
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12
12
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13
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+
return new String[] { split[0], split[1].split(":")[1] };
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14
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+
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15
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+
}).collect(Collectors.groupingBy(array -> array[0], TreeMap::new, Collectors.summingInt(array -> Integer.parseInt(array[1]))));
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16
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+
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13
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-
summary.entrySet().stream().forEach(entry -> System.out.println(entry.getKey() + ": " + entry.getValue()));
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17
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+
summary.entrySet().stream().forEach(entry -> System.out.println(entry.getKey() + ": " + entry.getValue()));
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18
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+
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19
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+
}
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14
20
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15
21
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}
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16
22
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