简单的工厂设计模式制作计算器

实体类：Operation

package cc.cm.Impl;

public class Operation {
private double number1=0.0;
private double number2=0.0;
public double getNumber1() {
return number1;
}
public void setNumber1(double number1) {
this.number1 = number1;
}
public double getNumber2() {
return number2;
}
public void setNumber2(double number2) {
this.number2 = number2;
}
public double GetResult(){
double result=0.0;
return result;
}

/**

main测试

*/
public static void main(String[] args) {
Operation oper=OperationFactory.createOperation("+");
oper.setNumber1(10.00);
oper.setNumber2(20.00);
double result=oper.GetResult();
System.out.println(result);
}
}
class OperationAdd extends Operation {

public double GetResult(){
double result=0.0;
result =getNumber1()+getNumber2();
return result;
}

}
class OperationSub extends Operation {

public double GetResult(){
double result=0.0;
result =getNumber1()-getNumber2();
return result;
}

}
class OperationMul extends Operation {

public double GetResult(){
double result=0.0;
result =getNumber1()*getNumber2();
return result;
}

}
class OperationDiv extends Operation {

public double GetResult(){
double result=0.0;
result =getNumber1()/getNumber2();
return result;
}

}

工厂类：

package cc.cm.Impl;

public class OperationFactory {

public static Operation createOperation(String f) {
Operation oper = null;
try {
switch (f) {
case "+":
oper=new OperationAdd();
break;
case "-":
oper=new OperationSub();
break;
case "*":
oper=new OperationMul();
break;
case "/":
oper=new OperationDiv();
break;
}

} catch (Exception e) {

}


return oper;
}
}