int qian =input/1000; //千位除以1000

int bai = input/100%10;//百位除以100%10

int shi = input%100/10;//十位%100/10

int ge = input%10;//个位直接%10

System.out.println("千位数"+qian+"百位是"+bai+"十位是"+shi+"个位数是"+ge);

//实现数据 的排序 获取各个位数

public static void main(String[] args) {

    System.out.println("请输入一个四位数");

    //定义变量接受

    @SuppressWarnings("resource")

    int number = new Scanner(System.in).nextInt();

    if(number>999&&number<10000) {

        char[] chars = String.valueOf(number).toCharArray();

        System.out.println("千位"+chars[0]);

        System.out.println("百位"+chars[1]);

        System.out.println("十位"+chars[2]);

        System.out.println("个位"+chars[3]);

    }else {

        System.out.println("你输入的不是四位数··系统终止！！请重新输入！！");

    }

}