字符串-替换数字- Java直接使用StringBuilder拼接字符串

[stahol-14]

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.next();

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            // 如果是字母，保留；如果是数字，替换为"number"
            if (c >= 'a' && c <= 'z') {
                sb.append(c);
            } else {
                sb.append("number");
            }
        }

        // 输出替换后的字符串
        System.out.println(sb.toString());

        sc.close();
    }
}