import java.util.Scanner;
public class Demo {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个4位的数字:");
String numbers = sc.next();
if (numbers.length() == 4) {
boolean b = numbers.matches("(..)\1");
if (b) {
System.out.println(numbers + "是ABAB形式的数字!");
} else {
System.out.println(numbers + "不是ABAB形式的数字!");
}
} else {
System.out.println("请输入一个4位的数字!");
}
sc.close();
}
}
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