method-Demo01-06

package com.kuang.method;
//=====================
//Demo01
//=====================
public class Demo01 {
    //main方法
    public static void main(String[] args) {
        int sum = add(1, 2);
        System.out.println(sum);
    }


    //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(){
            for (int i = 0; i <= 1000; i++) {
                if(i%5==0){
                    System.out.print(i+"\t");
                }
                if (i%(5*3)==0){//换行
                    System.out.println();
                }
            }
        }

 */
}

package com.kuang.method;
//=====================
//Demo02
//=====================
public class Demo02 {
    public static void main(String[] args) {

        double max = max(10.1,20.2);
        System.out.println(max);

    }

    //比大小
    public static double max(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;
    }

    //比较大小
    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 com.kuang.method;
//=====================
//Demo03
//=====================
public class Demo03 {
    public static void main(String[] args) {
        //arg.Length 数组长度
        for (int i=0; i < args.length; i++){
            System.out.println("args[" + i + "]: " + args[i]);
        }
    }
}

package com.kuang.method;
//=====================
//Demo04
//=====================
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);
    }
}

package com.kuang.method;
//=====================
//Demo05
//=====================
public class Demo05 {
    public static void main(String[] args) {
        Demo05 test = new Demo05();
        test.test();
    }


    public void test(){
        test();
    }
}

package com.kuang.method;
//=====================
//Demo06
//=====================
public class Demo06 {
    //2! 2*1
    //3! 3*2*1
    //5! 5*4*3*2*1

    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);
        }
    }
}