回答編集履歴
3
英語間違い
test
CHANGED
@@ -112,13 +112,13 @@
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-
List<Integer>
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List<Integer> evenNumList = new ArrayList<Integer>();
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for (int i : nums) {
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if (i % 2 == 0) {
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-
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evenNumList.add(i);
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}
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@@ -126,21 +126,21 @@
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// Integer[]
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// Integer[] evenNums = evenNumList.toArray(new Integer[0]);
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int[]
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int[] evenNums = new int[evenNumList.size()];
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for (int i = 0; i <
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for (int i = 0; i < evenNumList.size(); i++) {
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evenNums[i] = evenNumList.get(i);
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}
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for (int i :
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for (int i : evenNums) {
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System.out.println(i);
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2
追記
test
CHANGED
@@ -93,3 +93,57 @@
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93
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jshell>
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```
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---
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再追記:
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103
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104
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105
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最初の内容をJava5でも動く書き方をすると、下記のような感じでしょうか。
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```java
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int[] nums = {0,1,2,3,4,5,6,7,8,9,10,11};
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List<Integer> oddNumList = new ArrayList<Integer>();
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for (int i : nums) {
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if (i % 2 == 0) {
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oddNumList.add(i);
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}
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}
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// Integer[] oddNums = oddNumList.toArray(new Integer[0]);
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int[] oddNums = new int[oddNumList.size()];
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for (int i = 0; i < oddNumList.size(); i++) {
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oddNums[i] = oddNumList.get(i);
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}
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for (int i : oddNums) {
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System.out.println(i);
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}
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```
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1
追記
test
CHANGED
@@ -31,3 +31,65 @@
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$3 ==> int[6] { 1, 3, 5, 7, 9, 11 }
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```
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---
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追記:
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int[]からInteger[]への変換は手抜きしましたが、例えば下記のように実装できるかと思います。
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```bash
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$ /opt/jdk-9/bin/jshell
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| JShellへようこそ -- バージョン9
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| 概要については、次を入力してください: /help intro
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jshell> Comparator<Integer> cmp = new Comparator<Integer>(){
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...> public int compare(Integer n1, Integer n2) {
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...> if (n1 % 2 != n2 % 2) {
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...> return n1 % 2 - n2 % 2;
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...> } else {
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...> return n1 - n2;
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...> }
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...> }
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...> }
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cmp ==> 1@6500df86
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jshell> Integer[] nums = {0,1,2,3,4,5,6,7,8,9,10,11}
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nums ==> Integer[12] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }
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80
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81
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82
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jshell> Arrays.sort(nums, cmp);
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85
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jshell> nums
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89
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nums ==> Integer[12] { 0, 2, 4, 6, 8, 10, 1, 3, 5, 7, 9, 11 }
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90
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91
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jshell>
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+
```
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