Java方法

package github.method;

/**
 * @author subeiLY
 * @create 2021-05-27 9:28
 */
public class Demo01 {

    // main方法
    public static void main(String[] args) {
        int sum = add(1, 2);
        System.out.println(sum);
    }

    // 加法
    public static int add(int a,int b){
        return a+b;
    }
}

package github.method;

/**
 * @author subeiLY
 * @create 2021-05-27 9:46
 */
public class Demo02 {

    public static void main(String[] args) {
        int max = max(10, 20);
        System.out.println(max);
    }

    // 比大小
    public static int max(int num1,int num2){
        int result = 0;

        if(num1==num2){
            System.out.println("num1==num2");
            return 0;   // 终止方法
        }

        if(num1>num2){
            result = num1;
        } else {
            result = num2;
        }

        return result;
    }
}

package github.method;

/**
 * @author subeiLY
 * @create 2021-05-27 9:46
 */
public class Demo02 {

    public static void main(String[] args) {
        int max = max(10, 20);
        System.out.println(max);

        double max2 = max2(10.0, 20.0);
        System.out.println(max);
    }

    // 比大小
    public static int max(int num1,int num2){
        int result = 0;

        if(num1==num2){
            System.out.println("num1==num2");
            return 0;   // 终止方法
        }

        if(num1>num2){
            result = num1;
        } else {
            result = num2;
        }

        return result;
    }

    // 比大小
    public static double max2(double num1,double num2){
        double result = 0;

        if(num1==num2){
            System.out.println("num1==num2");
            return 0;   // 终止方法
        }

        if(num1>num2){
            result = num1;
        } else {
            result = num2;
        }

        return result;
    }
}

package github.method;

/**
 * @author subeiLY
 * @create 2021-05-27 10:41
 */
public class Demo03 {
    public static void main(String[] args) {
        // args.length 数组长度
        for(int i=0;i < args.length;i++){
            System.out.println("args[" + i + "]:" + args[i]);
        }
    }
}

package github.method;

/**
 * @author subeiLY
 * @create 2021-05-27 10:53
 */
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("没有数据！");
            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);
    }
}

package github.method;

import java.util.Scanner;

/**
 * @author subeiLY
 * @create 2021-05-27 12:02
 */
public class Demo05 {

    // 5! 5*4*3*2*1
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入一个数:");
        int number = scanner.nextInt();

        int test = test(number);

        System.out.println(number + "的阶乘:" + test);
    }

    public static int test(int n){
        if(n==1){
            return 1;
        }else{
            return n*test(n-1);
        }
    }
}