public static class checkPattern(String regex, String tip) { boolean flag; do { Scanner sc = new Scanner(System.in); String info = sc.next(); Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(info); if (!matcher.find()) { System.out.print(tip + "格式错误！请重新输入："); flag = true; } else { break; } sc.close(); // 增加资源释放 } while (flag); } public class example

以下是修改后的代码： ```java import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class CheckPatternExample { public static void checkPattern(String regex, String tip) { boolean flag = true; Scanner sc = new Scanner(System.in); while (flag) { String info = sc.next(); Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(info); if (!matcher.find()) { System.out.print(tip + "格式错误！请重新输入："); } else { flag = false; } } sc.close(); } public static void main(String[] args) { System.out.print("请输入用户名（必须为 6 个以内的字符，只能包含字母、数字和下划线）："); String regex = "^[a-zA-Z0-9_]{1,6}$"; checkPattern(regex, "用户名"); System.out.print("请输入密码（必须为 12 个以内的字符，必须包含大小写字母、数字和特殊字符）："); regex = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[!@#$%^&]).{1,12}$"; checkPattern(regex, "密码"); System.out.print("请输入邮箱："); regex = "^[A-Za-z0-9+_.-]+@[A-Za-z0-9.-]+$"; checkPattern(regex, "邮箱"); System.out.print("请输入手机号："); regex = "^1[3-9]\\d{9}$"; checkPattern(regex, "手机号"); System.out.print("请输入身份证号："); regex = "^[1-9]\\d{16}[\\dX]$"; checkPattern(regex, "身份证号"); System.out.println("恭喜您，注册成功！"); } } ``` 修改之处： - 给 `flag` 变量初始化为 `true`，确保循环能正常开始。 - 代码整体的可读性和格式进行了一定优化。 [2025-04-29 15:33:18 | AI问答 | 510点数解答]