1、简单工厂模式
最近重拾设计模式看了看,给自己总结一下!大家也瞧瞧

首先简单工厂模式.

可以理解为将一组对象的共性抽象出来一个抽象类作为父类.
假设A1,B1,C1三个类,将他们的共同行为,共同属性提取出来!
抽象出一个抽象类带一个抽象方法.

public abstract class Operation {//定义2个变量private double _numberA=0;private double _numberB=0;public double get_numberA() {return _numberA;}public void set_numberA(double numberA) {_numberA = numberA;}public double get_numberB() {return _numberB;}public void set_numberB(double numberB) {_numberB = numberB;}//定义抽象,方便子类重写public abstract double GetResult() throws Exception;}

将A1....都继承这个抽象类(继承当然要重写抽象方法)

public class OperationAdd extends Operation {//加法运算类，继承操作类！重写方法@Overridepublic double GetResult() {return super.get_numberA()+super.get_numberB();}}

现在做工厂类

public class OperationFactory {public static Operation createOperate(String op) {//这里定义oper为一个抽象类Operation oper = null;//以下为工厂if (op.equals("+")) {oper = new OperationAdd();} else if (op.equals("-")) {oper = new OperationSub();} else if (op.equals("*")) {oper = new OperationMul();} else if (op.equals("/")) {oper = new OperationDiv();}return oper;}}

设计模式的目的无非是降低耦合,代码重用,方便维护扩展