Java控制台實現計算器[面向對象思想-02]

import java.util.*;
public class Test01{
// 測試類
    public static void main(String [] args){

        finalTest();
    }

    public static void finalTest(){
        while(true){
//  實例化一個計算類的對象,通過 set 方法設置值, get方法獲取值
            OperationTest  p  = new OperationTest();
            p.setNum1(new Scanner(System.in).nextDouble());
            String s= new Scanner(System.in).next();
            p.setNum2(new Scanner(System.in).nextDouble());
            Test(p.getNum1(),s,p.getNum2());
        }
    }

    public static void Test(double num1,String e,double num2){

        final String a ="+",b="-",c="*",d="/";
        switch(e){
            case a:System.out.println(num1+e+num2+"="+OperationAdd.getResult());
              break;
            case b:System.out.println(num1+e+num2+"="+OperationSub.getResult());
              break;
            case c:System.out.println(num1+e+num2+"="+OperationMul.getResult());
              break;
            case d:System.out.println(num1+e+num2+"="+OperationDiv.getResult());
              break;

        }
    }

}
// 計算類的父類
class OperationTest{
    public  static double num1;
    public  static double num2;
    //  get  set 方法
    public OperationTest() {
    }

    public double getNum1() {
        return num1;
    }

    public double getNum2() {
        return num2;
    }

    public void setNum1(double num1) {
        this.num1 = num1;
    }

    public void setNum2(double num2) {
        this.num2 = num2;
    }

    public static double  getResult(){
        double result =0;
        return  result;
    }

}

//  計算加法的類 繼承 自計算類
class OperationAdd extends OperationTest{
    public static double getResult(){
        return num1+num2;
    }
}
//   計算減法的類 繼承自計算類
class OperationSub extends OperationTest{
    public static double getResult(){
        return num1-num2;
    }
}
//   計算乘法的類 繼承自計算類
class OperationMul extends OperationTest{
    public static double getResult(){
        return num1*num2;
    }
}
//  計算除法的類 繼承自計算類
class OperationDiv extends OperationTest{
    public static double getResult(){
        return num1/num2;
    }
}