java簡易計算器實作-有解無憂

java簡易計算器實作（web）

一，web版

環境：tomcat8，jdk1.8，STS，java ee
Java Web，是用Java技術來解決相關web互聯網領域的技術堆疊，web包括：web服務端和web客戶端兩部分，Java在客戶端的應用有Java Applet，不過使用得很少，Java在服務器端的應用非常的豐富，比如Servlet，JSP、第三方框架等等，Java技術對Web領域的發展注入了強大的動力，

Calculator_Interface.java

package Pojo;

/*
*@author: CaoPengCheng
*@data:2020-4-4
*@version 1.0
*@see Calculator
*/
public interface Calculator_Interface {
	public int jia(int... a);

	public double jia(double... a);

	public int jian(int... a);

	public double jian(double... a);

	public int chen(int... a);

	public double chen(double... a);

	public double chu(int... a);

	public double chu(double... a);
}

Calculator.java

package Pojo;

import java.util.Scanner;

/*
*@author: CaoPengCheng
*@data:2020-4-4
*@version 1.0
*@see Calculator_Interface,CalilatorServlet
*/
public class Calculator implements Calculator_Interface {

	private static Scanner sc = new Scanner(System.in);

	@Override
	public int jia(int... a) {
		int sum = 0;
		for (int x : a)
			sum += x;
		return sum;
	}

	@Override
	public double jia(double... a) {
		double sum = 0;
		for (double x : a)
			sum += x;
		return sum;
	}

	@Override
	public int jian(int... a) {
		int sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum - a[i];
		return sum;
	}

	@Override
	public double jian(double... a) {
		double sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum - a[i];
		return sum;
	}

	@Override
	public int chen(int... a) {
		int sum = 1;
		for (int x : a)
			sum *= x;
		return sum;
	}

	@Override
	public double chen(double... a) {
		double sum = 1.0f;
		for (double x : a)
			sum *= x;
		return sum;
	}

	@Override
	public double chu(int... a) {
		double sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum / a[i];
		return sum;
	}

	@Override
	public double chu(double... a) {
		double sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum / a[i];
		return sum;
	}

	public static int inputInt() {
		int a = sc.nextInt();
		return a;
	}

	public static String inputString() {
		return sc.next();
	}

	public static void scannerClose() {
		sc.close();
	}
}

Suan.java

package Suan;

import Pojo.Calculator;

/*
*@author: CaoPengCheng
*@data:2020-4-4
*@version 1.0
*@see Calculator,CalilatorServlet
*/
public class Suan {

	public static double suan(String s, int... data) {
		Calculator calculator = new Calculator();
		double d = 0;
		switch (s) {
		case "+":
			d = calculator.jia(data);
			break;
		case "-":
			d = calculator.jian(data);
			break;
		case "*":
			d = calculator.chen(data);
			break;
		case "/":
			d = calculator.chu(data);
			break;
		}
		return d;
	}
}

Calculator.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
		<title>計算器</title>
		<style type="text/css">
			.h1{
				text-align: center;
				font-size: 25px;
			}
			.error{
				margin-top: 50px;
				margin-left:50px;
				text-align: center;
				font-size: 30px;
				color: red;
			}
			
			.img{
				float:left;
			}
			.content{
				width: 670px;
				height:470px;
				margin-left:100px;
				text-align: center;
				/* border: 1px solid red; */
				float:right;
			}		
			.c1{
				margin-top: 50px;
				margin-left:50px;
				text-align: center;
			}
			.yun{
				margin-top: 20px;
				margin-left:70px; 
				text-align: center;
			}
			.c2{
				margin-top: 20px;
			 	margin-left:50px ;
				text-align: center;
			}
			.jie{
				margin-top: 20px;
				 margin-left:110px; 
				text-align: center;
			}
			.t{
				margin-top: 20px;
				 margin-left:50px; 
				text-align: center;
				font-size: 30px;
				color: green;
			}
			.b1{
				margin-top: 50px;
				text-align: center;
			}
			.b2{
				margin-top: 10px;
				text-align: center;
			}
		
		</style>
	</head>
	
	<body>
		<div class="h1"><h1>---誰也不服計算器---</h1></div>
			<div class="ddd">
			
			
				<div class="img"><img alt=""  style="width:450px;height:330px;" src="cxy.jpg"></div>
				
				<div class="content">
					<form action="Calulator" method="post">
						<br>
						<div class="error">${error}</div>
						<div class="c1">
							<label for="c1">輸入第一個數:</label>
							<input style="width: 320px;height: 30px" value="${c1}" type="text" name="c1" >
						</div>
						<div class="yun">
							<label for="yun">選擇運算子:</label>
							<select name="yun"  style="width: 320px;height: 30px">
								<option value="+">+</option>
								<option value="-">-</option>
								<option value="*">*</option>
								<option value="/">/</option>
							</select>
						</div>
						<div class="c2">
							<label for="c2">輸入第二個數:</label>
							<input style="width: 320px;height: 30px" value="${c2}" type="text" name="c2" >
						</div>
						<div class="jie">	
							<label for="c2">結果:</label>
							<input style="width: 320px;height: 30px" value="${jie}" type="text" name="結果" ><br>
						</div>
							<input style="width: 180px;height: 55px" type="submit" value="計算" name="sum" class="t">
					</form>
				</div>
			</div>
			
			
		<br>	
		<div class="b1"><h3>@CaoPengCheng</h3></div>
		<div class="b2"><h1>永遠相信美好的事情即將發生</h1></div>
	</body>
</html>

CalilatorServlet.java

package Service;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Suan.Suan;

/*
*@author: CaoPengCheng
*@data:2020-4-4
*@version 1.0
*@see Calculator,HttpServlet
*/
@WebServlet("/Calulator")
public class CalilatorServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("UTF-8");
		resp.setCharacterEncoding("GBK");
		String s1 = req.getParameter("c1");
		String s2 = req.getParameter("c2");
		String yun = req.getParameter("yun");
		double jie = 0;
		boolean f = true;
		int c1 = Integer.parseInt(s1);
		int c2 = Integer.parseInt(s2);
		String error = "分母為0！！！";
		if (yun.equals("/") && c2 == 0) {
			f = false;
			req.setAttribute("error", error);
		}
		if (f) {
			jie = Suan.suan(yun, c1, c2);
			req.setAttribute("jie", jie);
		}

		req.setAttribute("c1", c1);
		req.setAttribute("c2", c2);
		req.getRequestDispatcher("/Calulator.jsp").forward(req, resp);

	}
}

測驗

在這里插入圖片描述

二，控制臺版

Calculator_Interface.java

package Calculator;

/*
*@author: CaoPengCheng
*@data:2020-4-4
*@version 1.0
*@see Calculator
*/
public interface Calculator_Interface {
	public int jia(int... a);

	public double jia(double... a);

	public int jian(int... a);

	public double jian(double... a);

	public int chen(int... a);

	public double chen(double... a);

	public double chu(int... a);

	public double chu(double... a);
}

Calculator.java

package Calculator;

import java.util.Scanner;

/*
*@author: CaoPengCheng
*@data:2020-4-4
*@version 1.0
*@see Calculator_Interface
*/
public class Calculator implements Calculator_Interface {

	private static Scanner sc = new Scanner(System.in);

	@Override
	public int jia(int... a) {
		int sum = 0;
		for (int x : a)
			sum += x;
		return sum;
	}

	@Override
	public double jia(double... a) {
		double sum = 0;
		for (double x : a)
			sum += x;
		return sum;
	}

	@Override
	public int jian(int... a) {
		int sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum - a[i];
		return sum;
	}

	@Override
	public double jian(double... a) {
		double sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum - a[i];
		return sum;
	}

	@Override
	public int chen(int... a) {
		int sum = 1;
		for (int x : a)
			sum *= x;
		return sum;
	}

	@Override
	public double chen(double... a) {
		double sum = 1.0f;
		for (double x : a)
			sum *= x;
		return sum;
	}

	@Override
	public double chu(int... a) {
		double sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum / a[i];
		return sum;
	}

	@Override
	public double chu(double... a) {
		double sum = a[0];
		for (int i = 1; i < a.length; i++)
			sum = sum / a[i];
		return sum;
	}

	public void Suan(String s, int... data) {
		System.out.print("結果：");
		switch (s) {
		case "+":
			System.out.println(data[0] + "" + s + data[1] + "" + "=" + this.jia(data));
			break;
		case "-":
			System.out.println(data[0] + "" + s + data[1] + "" + "=" + this.jian(data));
			break;
		case "*":
			System.out.println(data[0] + "" + s + data[1] + "" + "=" + this.chen(data));
			break;
		case "/":
			System.out.println(data[0] + "" + s + data[1] + "" + "=" + this.chu(data));
			break;
		default:
			System.out.println("錯誤！");
		}
		System.out.println("永遠相信，美好的事情即將發生！");
	}

	public static int inputInt() {
		int a = sc.nextInt();
		return a;
	}

	public static String inputString() {
		return sc.next();
	}

	public static void scannerClose() {
		sc.close();
	}
}

Calulator_Test .java

package Calculator;

import org.junit.Test;

/*
*@author: CaoPengCheng
*@data:2020-4-4
*@version 1.0
*@see Calculator
*/
public class Calulator_Test {

	@Test
	public void Test2() {
		String s = "";
		while (true) {
			System.out.println("\n---誰也不服計算器---");
			System.out.println("請輸入一個數：");
			int c1 = Calculator.inputInt();
			System.out.println("請輸入運算子：");
			s = Calculator.inputString();
			if (s.equals("over")) {
				System.out.println("結束！");
				break;
			}
			System.out.println("請輸入二個數：");
			int c2 = Calculator.inputInt();
			if (c2 == 0) {
				System.out.println("分母為0！！！\n重新開始！");
				continue;
			}
			new Calculator().Suan(s, c1, c2);
		}
		Calculator.scannerClose();
	}

	public void Test1() {
		Calculator_Interface c = new Calculator();
		System.out.println("int jia=" + c.jia(1, 1));// 2
		System.out.println("dou jia=" + c.jia(1.0, 1.0));// 2.0
		System.out.println("int jian=" + c.jian(10, 5));// 5
		System.out.println("dou jian=" + c.jian(20.0, 10.0));// 10.0
		System.out.println("int chen=" + c.chen(2, 3));// 6
		System.out.println("dou chen=" + c.chen(2.0, 3.0));// 6.0
		System.out.println("int chu=" + c.chu(6, 2));// 3.0
		System.out.println("dou chu=" + c.chu(6.0, 2.0));// 3.0
		System.out.println(6.0 / 2.0);
	}
}

測驗

在這里插入圖片描述

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標籤：java

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