java简单工厂模式

来源：互联网发布：数据可视化方法编辑：程序博客网时间：2024/05/17 04:22

1.新建计算类

public class Operation {private double _numa;private double _numb;private double _result;/** * 获取_numa *  * @return _numa */public double get_numa() {return _numa;}/** * 设置_numa *  * @param _numa */public void set_numa(double _numa) {this._numa = _numa;}/** * 获取_numb *  * @return _numb */public double get_numb() {return _numb;}/** * 设置_numb *  * @param _numb */public void set_numb(double _numb) {this._numb = _numb;}/** * 获取_result *  * @return _result */public double get_result() {return _result;}/** * 设置_result *  * @param _result */public void set_result(double _result) {this._result = _result;}}

2.新建一个加法类继承OpetationAdd并重写get_result()方法

public class OperationFactory {/** * 创建运算类 */public static Operation createOperation(String operator) {Operation operation = null;switch (operator) {case "+":operation = new OperationAdd();break;default:break;}return operation;}/** * 描述方法的作用 *  * @param args */public static void main(String[] args) {Operation op = new OperationFactory().createOperation("+");op.set_numa(2);op.set_numb(2);System.out.println(op.get_result());}}

3.新建OperationFactory类并新建createOperation()方法实现抽象运算

public class OperationFactory {/** * 创建运算类 */public static Operation createOperation(String operator) {Operation operation = null;switch (operator) {case "+":operation = new OperationAdd();break;default:break;}return operation;}}

4.测试运行加法

public static void main(String[] args) {Operation op = new OperationFactory().createOperation("+");op.set_numa(2);op.set_numb(2);System.out.println(op.get_result());}

总结:

以后需要修改加法只要修改OperationAdd类即可
如果需要添加其他复杂运算,只要添加相关类并在OperationFactory类的createOperation()方法中添加switch分支即可

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