day14

标签：int image System day14 static println public

## 方法




***Java都是值传递***





能不用递归就不用递归


 

package com.fang.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);
        int sum2 = add(1,2,3);
        System.out.println(sum2);
        double sum3 = add(1.1,2.1);
        System.out.println(sum3);
        double sum4 = add(1.1,1.1);
        System.out.println(sum4);
        double sum5 = add(2.1,4.8);
        System.out.println(sum5);
    }


    //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 int add(int a,int b,int c){
        return a+b+c;
    }

    public static double add(double a,double b){
        return a+b;
    }

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

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

}

package com.fang.method;

public class Demo02 {
    public static void main(String[] args) {
        int a = max(10,10);
        System.out.println(a);
        int c = min(80,80);
        System.out.println(c);
    }

    //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;
    }

    public static int min(int a,int b){
        int result=-1;
        if(a==b){
            System.out.println("两个数相等");
            return 000;
        }
        if (a>b){
            result = b;
        }else{
            result = a;
        }
        return result;
    }
}

package com.fang.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.fang.method;

public class Demo04 {
    public static void main(String[] args) {
        // 调用可变参数的方法
        Demo04 demo04 = new Demo04();
        demo04.test(1,2,3,5);
        printMax(1,2,3);
        printMax(new double[]{3.3,2.2,1.1});//new double 啥意思
    }

    public void test(int ... i){
        System.out.println(i[3]);
    }
    public static void printMax(double... numbers){
        if (numbers.length == 0){
            System.out.println("No argument passed");
            return;
        }

        double result = numbers[0];

        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.fang.method;

public class Demo05 {
    public static void main(String[] args) {
        Demo05 test = new Demo05();
        test.test();
    }

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

package com.fang.method;

public class Demo06 {

    //递归思想
    public static void main(String[] args) {
        System.out.println(f(6));
    }

    //阶乘
    //1!    1
    //2!    2*1
    //3!    3*2*1
    public static int f(int n){
        if (n==1){
            return 1;
        }else{
            return n*f(n-1);
        }
    }
}

标签：int,image,System,day14,static,println,public
From： https://www.cnblogs.com/biao3/p/17018265.html