回答編集履歴
3
if分のネストが深くならないよう修正
test
CHANGED
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@@ -46,37 +46,27 @@
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46
46
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47
47
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// list.sort(new ListIntegerComparator());
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48
48
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49
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-
// Collections
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49
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+
// Collections.reverse(list);
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50
50
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51
51
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class IntegerListComparator implements Comparator<List<Integer>> {
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52
52
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53
53
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@Override public int compare(List<Integer> a, List<Integer> b) {
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54
54
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55
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-
i
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55
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+
Integer i = a.get(1) - b.get(1);
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56
56
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57
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-
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57
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+
if (i == 0) {
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58
58
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59
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-
if (Objects.equals(a.get(3), b.get(3))) {
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60
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-
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61
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-
return 0;
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62
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-
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63
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-
} else {
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64
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-
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65
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-
return a.get(3) - b.get(3);
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66
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-
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67
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-
}
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68
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-
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69
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-
} else {
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70
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-
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71
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-
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59
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+
i = a.get(2) - b.get(2);
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72
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-
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73
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-
}
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74
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-
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75
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-
} else {
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76
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-
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77
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-
return a.get(1) - b.get(1);
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78
60
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79
61
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}
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62
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+
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63
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+
if (i == 0) {
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64
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+
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65
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+
i = a.get(3) - b.get(3);
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66
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+
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67
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+
}
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68
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+
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69
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+
return i;
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80
70
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81
71
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}
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82
72
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2
Java 1.8 以前？でのサンプルを追加
test
CHANGED
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@@ -42,6 +42,44 @@
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42
42
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43
43
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}
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44
44
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45
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+
// Java 1.8 以前
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45
46
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47
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+
// list.sort(new ListIntegerComparator());
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48
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+
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49
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+
// Collections#reverse(list);
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50
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+
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51
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+
class IntegerListComparator implements Comparator<List<Integer>> {
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52
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+
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53
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+
@Override public int compare(List<Integer> a, List<Integer> b) {
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54
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+
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55
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+
if (Objects.equals(a.get(1), b.get(1))) {
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56
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+
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57
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+
if (Objects.equals(a.get(2), b.get(2))) {
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58
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+
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59
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+
if (Objects.equals(a.get(3), b.get(3))) {
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60
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+
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61
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+
return 0;
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62
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+
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63
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+
} else {
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64
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+
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65
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+
return a.get(3) - b.get(3);
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66
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+
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67
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+
}
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68
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+
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69
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+
} else {
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70
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+
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71
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+
return a.get(2) - b.get(2);
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72
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+
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73
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+
}
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74
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+
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75
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+
} else {
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76
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+
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77
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+
return a.get(1) - b.get(1);
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78
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+
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79
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+
}
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80
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+
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81
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+
}
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82
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+
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83
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+
}
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46
84
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47
85
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```
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1
インデックスが間違っていた
test
CHANGED
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@@ -28,9 +28,9 @@
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28
28
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29
29
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list.sort(Comparator.<List<Integer>>comparingInt(l -> l.get(0))
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30
30
|
|
|
31
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+
.thenComparingInt(l -> l.get(1))
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32
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+
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31
33
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.thenComparingInt(l -> l.get(2))
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|
32
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-
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|
33
|
-
.thenComparingInt(l -> l.get(3))
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34
34
|
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35
35
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.reversed());
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36
36
|
|