java笔试题：找出3~999的水仙花数的三种实现方式

package test;

public class Exsercise {
    
    public static void main(String[] args) {
        int sum;
        System.out.println("100~999之间的水仙花数为：");
        for (int i = 100; i <= 999; i++) {
            sum = getCubic(i/100) + getCubic((i/10)%10) + getCubic(i%10);
            if(sum == i){
                System.out.print(i + " ");
            }
        }
    }
    
    public static int getCubic(int num){
        num = num * num * num;
        return num;
    }
}

package test;

public class Exsercise {
    
    public static void main(String[] args) {
        int sum;
        int i = 100;
        System.out.println("100~999之间的水仙花数为：");
        while(i < 1000){
            sum = getCubic(i/100) + getCubic((i/10)%10) + getCubic(i%10);
            if (sum == i) {
                System.out.print(i + " ");
            }
            i++;
        }
    }
    
    public static int getCubic(int num){
        num = num * num * num;
        return num;
    }
}

package test;

public class Exsercise {
    
    public static void main(String[] args) {
        int sum;
        int i = 100;
        System.out.println("100~999之间的水仙花数为：");
        do{
            sum = getCubic(i/100) + getCubic((i/10)%10) + getCubic(i%10);
            if (sum == i) {
                System.out.print(i + " ");
            }
            i++;
        }while(i<1000);
    }
    
    public static int getCubic(int num){
        num = num * num * num;
        return num;
    }
}