MASCHINE test Linear Regression with Multiple Variables

package samples.string.japanese;
public class ZenkakuAlphabetToHankakuAlphabet {
public static String zenkakuAlphabetToHankaku(String s) {
StringBuffer sb = new StringBuffer(s);
for (int i = 0; i < sb.length(); i++) {
char c = sb.charAt(i);
if (c >= 'ａ' && c <= 'ｚ') {
sb.setCharAt(i, (char) (c - 'ａ' + 'a'));
} else if (c >= 'Ａ' && c <= 'Ｚ') {
sb.setCharAt(i, (char) (c - 'Ａ' + 'A'));
}
}
return sb.toString();
}
public static void main(String[] args) {
System.out.println(zenkaku AlphabbetToHankaku("☆Java 프로그래밍☆");
}
}