Day9

何为方法

package com.zhu.method;


public class Demo02 {
    public static void main(String[] args) {
        int max = max(30, 40);
        System.out.println(max);


    }
    //比大小
    public static int max(int num1,int num2){
        int result=0;
        if(num1==num2){
            System.out.println("两数想等");
            return 0 ;//终止方法
        }
        if(num1>num2){
            result = num1;
        }
        else {
            result = num2;
        }
        return result;

    }
}

package com.zhu.method;

public class Demo01 {
    //main方法
    public static void main(String[] args) {
        //实际参数：实际调用传递给他的参数
        int sum = add(1, 2);
        System.out.println(sum);
        //test();

    }
    //加法
    //形式参数，用来定义作用的
    public static int add(int a,int b){
        return a+b;
    }

    public static void test(){
        //用for循环输出1-1000之间能被5整除的数，并且每行输出3个
        for (int i = 1; i <=1000; i++) {
            if(i%5==0){
                System.out.print(i+"\t");
            }
            if(i%15==0){
                System.out.println("\n");
            }
        }
    }
    }

package com.zhu.method;


public class Demo02 {
    public static void main(String[] args) {
        int max = max(30, 40);
        System.out.println(max);


    }
    //比大小
       public static double max(double num1,double num2){
        double result=0;
        if(num1==num2){
            System.out.println("两数想等");
            return 0 ;//终止方法
        }
        if(num1>num2){
            result = num1;
        }
        else {
            result = num2;
        }
        return result;

    }

    //比大小
    public static int max(int num1,int num2){
        int  result=0;
        if(num1==num2){
            System.out.println("两数想等");
            return 0 ;//终止方法
        }
        if(num1>num2){
            result = num1;
        }
        else {
            result = num2;
        }
        return result;

    }
}

package com.zhu.method;


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 com.zhu.method;


//递归
public class Demo04 {
    public static void main(String[] args) {
        System.out.println(f(3));



    }

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