[数据结构与算法]java学习p171

import java.util.Scanner;
public class a1 {
    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 4, 5};
        System.out.print("此时数组为 ");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        Scanner myScanner = new Scanner(System.in);
        label:
        do {
            if (arr.length == 1) {
                System.out.println("不能再缩减");
                break;
            }
            do {
                System.out.println("是否对数组缩减 y/n");
                char choose = myScanner.next().charAt(0);
                if (choose == 'y') {
                    int[] arrNew = new int[arr.length - 1];
                    for (int i = 0; i < arrNew.length; i++) {
                        arrNew[i] = arr[i];
                    }
                    arr = arrNew;
                    System.out.print("缩减后的数组为 ");
                    for (int i = 0; i < arr.length; i++) {
                        System.out.print(arr[i] + " ");
                    }
                    System.out.println();
                    break;
                } else if (choose == 'n') {
                    System.out.println("退出");
                    break label;
                } else {
                    System.out.println("输入错误，请重新输入");
                }
            }while (true);
        }while (true);
        System.out.println("程序结束");
    }
}