可变参数

package method;

import javax.swing.*;

public class Demo04 {
    public static void main(String[] args) {
        //调用可变参数的方法
        printMax(34,3,3,2,56.5);
        printMax(new double[]{1, 2, 3});
    }

    public static void printMax(double...numbers) {
        if (numbers.length == 0) {
            System.out.println("No argument passed");
            return;
        }
        double result = numbers[0];

        //排序！
        for (int i = 1; i < numbers.length; i++) {
            if (numbers[i] > result) {
                result = numbers[i];
            }
        }
        System.out.println("The max value is" + result);
    }
    };

递归

package method;

public class Demo06 {

    //递归思想
    public static void main(String[] args) {
        System.out.println(f(5));
    }


    public static int f(int n){

        if (n==1){
            return 1;
        }else{
            return n*f(n-1);
        }

    }
}