回答編集履歴
3
if分のネストが深くならないよう修正
answer
CHANGED
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@@ -22,22 +22,17 @@
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22
22
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}
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23
23
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// Java 1.8 以前
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24
24
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// list.sort(new ListIntegerComparator());
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25
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-
// Collections
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25
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+
// Collections.reverse(list);
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26
26
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class IntegerListComparator implements Comparator<List<Integer>> {
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27
27
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@Override public int compare(List<Integer> a, List<Integer> b) {
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28
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-
if (Objects.equals(a.get(1), b.get(1))) {
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29
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-
if (Objects.equals(a.get(2), b.get(2))) {
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30
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-
if (Objects.equals(a.get(3), b.get(3))) {
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31
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-
return 0;
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32
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-
} else {
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33
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-
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28
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+
Integer i = a.get(1) - b.get(1);
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34
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-
}
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35
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-
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29
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+
if (i == 0) {
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36
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-
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30
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+
i = a.get(2) - b.get(2);
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37
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-
}
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38
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-
} else {
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39
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-
return a.get(1) - b.get(1);
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40
31
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}
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32
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+
if (i == 0) {
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33
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+
i = a.get(3) - b.get(3);
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34
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+
}
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35
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+
return i;
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41
36
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}
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42
37
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}
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43
38
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```
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2
Java 1.8 以前？でのサンプルを追加
answer
CHANGED
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@@ -20,5 +20,24 @@
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20
20
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// [[30, 45, 72], [27, 35, 77], [27, 33, 59], [15, 20, 35], [15, 20, 31]]
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21
21
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}
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22
22
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}
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23
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-
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23
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+
// Java 1.8 以前
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24
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+
// list.sort(new ListIntegerComparator());
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25
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+
// Collections#reverse(list);
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26
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+
class IntegerListComparator implements Comparator<List<Integer>> {
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27
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+
@Override public int compare(List<Integer> a, List<Integer> b) {
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28
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+
if (Objects.equals(a.get(1), b.get(1))) {
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29
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+
if (Objects.equals(a.get(2), b.get(2))) {
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30
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+
if (Objects.equals(a.get(3), b.get(3))) {
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31
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+
return 0;
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32
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+
} else {
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33
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+
return a.get(3) - b.get(3);
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34
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+
}
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35
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+
} else {
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36
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+
return a.get(2) - b.get(2);
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37
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+
}
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38
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+
} else {
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39
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+
return a.get(1) - b.get(1);
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40
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+
}
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41
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+
}
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42
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+
}
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24
43
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```
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1
インデックスが間違っていた
answer
CHANGED
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@@ -13,8 +13,8 @@
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13
13
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Arrays.asList(27, 33, 59),
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14
14
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Arrays.asList(27, 35, 77));
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15
15
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list.sort(Comparator.<List<Integer>>comparingInt(l -> l.get(0))
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16
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+
.thenComparingInt(l -> l.get(1))
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16
17
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.thenComparingInt(l -> l.get(2))
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17
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-
.thenComparingInt(l -> l.get(3))
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18
18
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.reversed());
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19
19
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System.out.println(list);
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20
20
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// [[30, 45, 72], [27, 35, 77], [27, 33, 59], [15, 20, 35], [15, 20, 31]]
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