[Java] 全角の数字・小数点記号・マイナス記号を半角に変換

ZenkakuUtils.java

public static String toHankakuNum(String text) {
  StringBuilder res = new StringBuilder();
  final String listZens = "０１２３４５６７８９．－";
  final String listHans = "0123456789.-";

  for (int textIdx = 0; textIdx < text.length(); textIdx++) {
    char ch = text.charAt(textIdx);
    int listIdx = listZens.indexOf(ch);
    if (listIdx >= 0) {
      res.append(listHans.charAt(listIdx));
    } else {
      res.append(ch);
    }
  }

  return res.toString();
}

@Test
public void testToHankakuNum() {
  assertEquals("", Utilities.toHankakuNum(""));
  assertEquals("1", Utilities.toHankakuNum("１"));
  assertEquals("a", Utilities.toHankakuNum("a"));
  assertEquals("あ", Utilities.toHankakuNum("あ"));
  assertEquals("-123456789.0", Utilities.toHankakuNum("－１２３４５６７８９．０"));
  assertEquals("11aあ22", Utilities.toHankakuNum("１1aあ２2"));
}

It was a great help! Thank you.