身份证排序

import java.util.*;

public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);//新创建一个输入的Scanner 对象，然后赋值给in

        int n = scan.nextInt();

        scan.nextLine();

        String A[] = new String[n], C[] = new String[n];

        for (int i = 0; i < n; i++) {

            A[i] = scan.nextLine();

        }

        String B = scan.nextLine();//查找并返回下一个完整标记从这个扫描仪

        for (; B.equals("sort1") || B.equals("sort2");) {

            if (B.equals("sort1")) {

                for (int j = 0; j < n; j++) {

                    C[j] = A[j].substring(6, 10) + "-" + A[j].substring(10, 12) + "-" + A[j].substring(12, 14);//返回第一个参数中从第二个参数指定的位置开始、第三个参数指定的长度的子字符串

                }

                Arrays.sort(C);

                for (int j = 0; j < n; j++) {

                    System.out.println(C[j].toString());

                }

            } else if (B.equals("sort2")) {

                for (int j = 0; j < n; j++) {

                    C[j] = A[j].substring(6, 14);

                }

                Arrays.sort(C);//Arrays中的sort()方法主要是针对各种数据类型（基本数据类型和引用对象类型）的数组元素排序

                for (int j = 0; j < n; j++)

                    for (int k = 0; k < n; k++)

                        if (A[k].contains(C[j]))

                            System.out.println(A[k].toString());

            }

            System.out.println("exit");

            B = scan.nextLine();

        }

        scan.close();

    }

}