四则运算 测试与封装

import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
System.out.println("运算符是 +，-，*，/");
Scanner sc = new Scanner(System.in);
System.out.println("请输入第一个数：");
String aStr = sc.nextLine();
System.out.println("请输入第二个数：");
String bStr = sc.nextLine();
System.out.println("请输入运算符：");
String cc = sc.nextLine();
double a = Double.parseDouble(aStr);
double b = Double.valueOf(bStr);

Core core = new Core();
core.calc(cc, a, b);
}
}
public class Core {
public void calc(String cc, double a, double b) {
if (cc.equals("+")) {
System.out.println(a + b);
} else if (cc.equals("-")) {
System.out.println(a - b);
} else if (cc.equals("*")) {
System.out.println(a * b);
} else if (cc.equals("/")) {
if (b != 0) {
System.out.println(a / b);
} else {
System.out.println("分母不能为零！");
}
} else {
System.out.println("输入不符合要求！");
}
}
}

结对同学：莫俊余http://www.cnblogs.com/mjysok/