简单工厂模式的UML类图与源码实现

简单工厂模式的UML图

 

源码：Operation类

package com.felix;public abstract class Operation {double numberA = 0;double numberB = 0;public double getNumberA() {return numberA;}public void setNumberA(double numberA) {this.numberA = numberA;}public double getNumberB() {return numberB;}public void setNumberB(double numberB) {this.numberB = numberB;}public abstract double operate();}

加类：

package com.felix;public class Add extends Operation {@Overridepublic double operate() {return numberA + numberB;}}

 

 减类：

package com.felix;public class Sub extends Operation {@Overridepublic double operate() {return numberA - numberB;}}

乘类：

package com.felix;public class Mul extends Operation {@Overridepublic double operate() {return numberA * numberB;}}

除类：

package com.felix;public class Div extends Operation {@Overridepublic double operate() {try {return numberA / numberB;} catch (Exception e) {System.out.println("除数不能为空！");return 0;}}}

 

工厂类:

package com.felix;public class OperationFactory {public static Operation createOperation(char operate){Operation operation = null;switch(operate){case '+' :operation = new Add();break;case '-' :operation = new Sub();break;case '*' :operation = new Mul();break;case '/' :operation = new Div();break;}return operation;}}

客户端：

package com.felix;public class Client {/** * @param args */public static void main(String[] args) {Operation operation = OperationFactory.createOperation('+');operation.setNumberA(10);operation.setNumberB(15);System.out.println(operation.operate());}}