工厂类计算器

最新推荐文章于 2022-02-25 21:57:21 发布

原创最新推荐文章于 2022-02-25 21:57:21 发布 · 505 阅读

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#exception #class #import #string #c

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Operate{
double numA;
double numB;
public double getResult(double numA,double numB){
double result =0d;
return result;
}
}

class AddOperate extends Operate{

public double getResult(double numA,double numB){
  double result =0d;
  result=numA+numB;
  return result;
}
}

class SubOperate extends Operate{

public double getResult(double numA,double numB){
  double result =0d;
  result=numA-numB;
  return result;
}
}

class MulOperate extends Operate{

public double getResult(double numA,double numB){
  double result =0d;
  result=numA*numB;
  return result;
}
}

class DivOperate extends Operate{

public double getResult(double numA,double numB){
  double result =0d;
  try {
   if (numB == 0) {
    throw new Exception("除数不能为零！");
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  result=numA/numB;
  return result;
}
}

class Factory{

public static Operate createOperate(char c){
Operate op=null;
switch (c){

  case '+':
   op=new AddOperate();
   break;
  case '-':
   op=new SubOperate();
   break;
  case '*':
   op=new MulOperate();
   break;
  case '/':
   op=new DivOperate();
   break;
  }
  return op;

}
}

public class Test {

public static void main(String [] args)
{
  double numA = 0;
  char c = 0;
  double numB = 0;

  try {
   System.out.println("请输入第一个数字：");
   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
   numA = Double.parseDouble(br.readLine());

   System.out.println("请选择运算方法(+,-,*,/):");
   BufferedReader br2=new BufferedReader(new InputStreamReader(System.in));
   c = br2.readLine().charAt(0);

   System.out.println("请输入第二个数字：");
   BufferedReader br3=new BufferedReader(new InputStreamReader(System.in));
   numB = Double.parseDouble(br.readLine());

  } catch (Exception e) {
   e.printStackTrace();
  }