回答編集履歴
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追記
test
CHANGED
@@ -107,3 +107,151 @@
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ラムダ式内から外部変数への再代入が効かないので、苦肉の策でクラスを組んでいます。
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別解その1
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---
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関数型インターフェースを使わないで頑張ってみた方法。[Wandbox](https://wandbox.org/permlink/x3B7QqjipmmJdLs8)
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```Java
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import java.util.regex.Pattern;
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class Main {
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public static void main(String[] args) {
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var text = "apple banana belly banana apple belly";
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String dst;
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{
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var dstBuilder = new StringBuilder();
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var matcher = Pattern.compile("apple").matcher(text);
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var offset = 0;
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for(var cnt = 0; matcher.find(offset); ++cnt) {
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var start = matcher.start();
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var end = matcher.end();
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dstBuilder.append(
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text.substring(offset, start)
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);
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dstBuilder.append(
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String.format("%s#%d", matcher.group(), cnt+1)
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);
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offset = end;
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}
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dstBuilder.append(
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text.substring(offset, text.length())
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);
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dst = dstBuilder.toString();
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}
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System.out.println(dst);
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}
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}
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```
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別解その2
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---
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正規表現を使わずに頑張ってみた方法。[Wandbox](https://wandbox.org/permlink/5To8TaU7goFJSlxV)
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各単語がスペース区切りならこれで充分です。
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```Java
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import java.util.StringJoiner;
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class Main {
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public static void main(String[] args) {
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var text = "apple banana belly banana apple belly";
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String dst;
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{
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var joiner = new StringJoiner(" ");
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var cnt = 0;
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for(var word: text.split(" ")) {
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if(word.equals("apple")) {
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word = String.format("%s#%d", word, ++cnt);
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}
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joiner.add(word);
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}
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dst = joiner.toString();
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}
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System.out.println(dst);
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}
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}
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```
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