method

package method;

public class Demo01 {
    public static void main(String[] args) {
        //int sum = add(1, 2);
        //System.out.println(sum);
        test();
    }
    public static int add(int a,int b){
        return a+b;
    }
    public static void test(){
        for (int i=1;i<=1000;i++){
            if (i%5==0){
                System.out.print(i+"\t");
            }
            if (i%(3*5)==0){
                System.out.println();
                //System.out.print("\n");
            }
        }
    }
}

package method;

public class Demo02 {
    public static void main(String[] args) {
        //int max = max(10, 10);
        //System.out.println(max);
        int b = max(10,20,30);
        System.out.println(b);
        double a = max(10.2, 10);
        System.out.println(a);
        double c = max(10, 10.2);
        System.out.println(c);
        //Demo02 demo02 = new Demo02();
        //int test = demo02.test(3);
        //System.out.println(test);
    }

    public static int max(int num1,int num2){
        int result = 0;
        if (num1==num2){
            System.out.println("num1=num2");
            return 0;
        }
        if (num1>num2){
            result = num1;
        } else {
            result = num2;
        }
        return result;
    }
    public static double max(int num1,double num2){
        double result = 0;
        if (num1==num2){
            System.out.println("num1=num2");
            return 0;
        }
        if (num1>num2){
            result = num1;
        } else {
            result = num2;
        }
        return result;
    }
    public static double max(double num1,int num2){
        double result = 0;
        if (num1==num2){
            System.out.println("num1=num2");
            return 0;
        }
        if (num1>num2){
            result = num1;
        } else {
            result = num2;
        }
        return result;
    }
    public static int max(int num1,int num2,int num3){
        int result = 0;
        if (num1==num2&&num1==num3){
            System.out.println("num1=num2=num3");
            return 0;
        }
        if (num1>num2){
            result = num1;
        } else {
            result = num2;
        }
        return result;
    }
    public static double max(double num1,double num2){
        double result = 0;
        if (num1==num2){
            System.out.println("num1=num2");
            return 0;
        }
        if (num1>num2){
            result = num1;
        } else {
            result = num2;
        }
        return result;
    }
    public int test(int a){
        int sum = 0;
        while(a<5){
            sum+=a;
            a++;
        }
        return sum;
    }
}

package method;

public class Demo03 {
    public static void main(String[] args) {
        for (int i = 0; i < args.length; i++) {
            System.out.println("args["+i+"]:"+args[i]);
        }
    }
}

package method;

public class Demo04 {
    public static void main(String[] args) {
        Demo04 demo04 = new Demo04();
        demo04.printMax();
        demo04.printMax(-10,-20.2,-30,-50,-6.3);
        printMax(new double[]{1,2,3});

    }
    public static void printMax(double... number){
        if (number.length==0){
            System.out.println("No argument passed.");
            return;
        }
        double result = number[0];
        for (int i = 1; i < number.length; i++) {
            if (number[i] > result) {
                    result = number[i];
            }
        }
        System.out.println("The max value is "+result);

    }
    /*public static void main(String[] args) {
        Demo04 demo04 = new Demo04();
        demo04.test(1,4,5,65,9);
    }
    public void test(int x,int... i){
        System.out.println(x);
        System.out.println(i[0]);
        System.out.println(i[1]);
        System.out.println(i[2]);
        System.out.println(i[3]);

    }

     */
}

package method;

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

package method;

public class Demo06 {
    public static void main(String[] args) {
        System.out.println(f(4));
    }
    public static int f(int i){
        if (i==1){
            return 1;
        }else {
            return i*f(i-1);
        }
    }
}

package method;

import java.util.Scanner;

public class Demo07 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while(scan.hasNextLine()){
            String operator = scan.nextLine();
            double n = scan.nextDouble();
            double m = scan.nextDouble();
            scan.nextLine();
            double result ;
            switch(operator){
                case "+" :
                    result = calplus(n,m);
                    System.out.println(result);
                    break;
                case "-" :
                    result = calminus(n,m);
                    System.out.println(result);
                    break;
                case "*" :
                    result = calmulti(n,m);
                    System.out.println(result);
                    break;
                case "/" :
                    result = caldivide(n,m);
                    System.out.println(result);
                    break;
                default:
                    System.out.println("输入的运算符不合法");
            }
        }
        scan.close();
    }
    public static double calplus(double n,double m){
        return m+n;
    }
    public static double calminus(double n,double m){
        return n-m;
    }
    public static double calmulti(double n,double m){
        return m*n;
    }
    public static double caldivide(double n,double m){
        return n/m;
    }
}