题解 | #找出字符串中第一个只出现一次的字符#

import java.util.Scanner;

public class Main {

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    while (sc.hasNext()) {
        String str = sc.nextLine();
        System.out.println(firstOneStr(str));
    }
}

private static String firstOneStr(String str) {
    for (int i = 0; i < str.length(); i++) {
        String tempStr = str.replaceAll(str.charAt(i) + "", "");
        if (str.length() - tempStr.length() == 1) {
            return str.charAt(i)+"";
        }
    }
    return "-1";
}

}