public static void main(String[] args) {
IFactory factory = new MutiFactory();
Operation operation = factory.createOperation();
operation.setNum1(19);
operation.setNum2(8);
System.out.println(operation.getResult());
}
public static void main(String[] args) {
/*
* 普通面向对象的实现方式：
* 1、需要明确指定需要实例化类
* 2、不利于扩展
*
* 下面是使用简单工厂模式实现方式
* 这样添加其他操作，只需要增加相应的实现类并修改工厂类,符合开放-封闭原则中的开放原则，
* 但是，扩展时仍需要修改工厂类，所以不符合封闭原则
*/
System.out.println("---计算器程序---");
System.out.println("---输入第一个操作数---");
Scanner scanner = new Scanner(System.in);
String strNum1 = scanner.nextLine();
System.out.println("---输入运算符---");
String oper = scanner.nextLine();
System.out.println("---输入第二个操作数---");
String strNum2 = scanner.nextLine();
double num1 = Double.parseDouble(strNum1);
double num2 = Double.parseDouble(strNum2);
scanner.close();
// 2、进行计算
double result = 0;
Operation operation = null;
if ("+".equals(oper)) {
OperationFactory addOpFactory = new AddOperationFactory();
operation = addOpFactory.getOperatin();
} else if ("-".equals(oper)) {
OperationFactory subtractOpFactory = new SubtractOperationFactory();
operation = subtractOpFactory.getOperatin();
} else if ("*".equals(oper)) {
OperationFactory multiplyOpFactory = new MultiplyOperationFacoty();
operation = multiplyOpFactory.getOperatin();
} else if ("/".equals(oper)) {
OperationFactory dividOpFactory = new DividOperationFactory();
operation = dividOpFactory.getOperatin();
} else {
System.out.println("非法操作符");
}
operation.setNum1(num1);
operation.setNum2(num2);
result = operation.getResult();
// 3、返回结果
System.out.println("---计算结果---");
System.out.println(strNum1 + oper + strNum2 + "=" + result);
}
public static void main(String[] args) {
// 1.接受控制台输入
System.out.println("---计算器程序---");
System.out.println("输入第一个操作数");
Scanner scanner = new Scanner(System.in);
String strNum1 = scanner.nextLine();
System.out.println("输入运算符");
String oper = scanner.nextLine();
System.out.println("输入第二个操作数");
String strNum2 = scanner.nextLine();
double result = 0;
double num1 = Double.parseDouble(strNum1);
double num2 = Double.parseDouble(strNum2);
// 2.进行运算
if ("+".equals(oper)) {
OperationFactory factory = new AddOperationFactory();
Operation operation = factory.getOperation();
operation.setNum1(num1);
operation.setNum2(num2);
result = operation.getResult();
}
// 3.返回结果
System.out.println(strNum1 + oper + strNum2 + "=" + result);
}
