Java实现一个简单的计算器，实现计算器中加、减、乘、除的运算方法

java实现一个简单的计算器

import java.util.Scanner;
public class Calculation{
    public static void main(String[] args) {
    //计算器实现加减乘除的功能
        Scanner scanner = new Scanner(System.in);
        double i=0.0,j=0.0;
        double result=0.0;
        
        System.out.println("请输入第一个数：");
        i=scanner.nextDouble();
        System.out.println("请输入运算符号:");
        String c=scanner.next();
        System.out.println("请输入第二个数：");
        j=scanner.nextDouble();
        switch (c){
            case "+":
                result=add(i,j);break;
            case "-":
                result=reduce(i,j);break;
            case "*":
                result=multiply(i,j);break;
            case "/":
                result=division(i,j);break;
        }
        System.out.println(result);

        scanner.close();

    }
    public static double add(double a,double b){
        return a+b;
    }
    public static double reduce(double a,double b){
        return a-b;
    }
    public static double multiply(double a,double b){
        return a*b;
    }
    public static double division(double a,double b){
        return a/b;
    }
}