标签:客户端程序 factor xtend 客户端 creat script factory system.in desc
简单工厂模式,也叫静态工厂模式,即由一个静态工厂类来统一创建所需要的实例对象。
本例中,将主要实现加减乘除计算。
第一步,定义抽象基类Operation
1 /** 2 * @author abo 3 * @title Operation 4 * @ProjectName Test 5 * @Description: 运算类的基类,定义了两个运算数 6 * @CreateDate 2018-10-13 14:15 7 */ 8 public abstract class Operation { 9 private double numberA=0; 10 private double numberB=0; 11 12 public double getNumberA() { 13 return numberA; 14 } 15 16 public void setNumberA(double numberA) { 17 this.numberA = numberA; 18 } 19 20 public double getNumberB() { 21 return numberB; 22 } 23 24 public void setNumberB(double numberB) { 25 this.numberB = numberB; 26 } 27 28 public abstract double getResult(); 29 }
第二步:定义加减乘除四个子类继承于Operation类
OperationAdd(加法运算子类)
1 /** 2 * @author abo 3 * @title OperationAdd 4 * @ProjectName Test 5 * @Description: 继承操作类,实现加法运算 6 * @CreateDate 2018-10-13 14:17 7 */ 8 public class OperationAdd extends Operation { 9 10 @Override 11 public double getResult() { 12 double result = 0; 13 result = getNumberA()+getNumberB(); 14 return result; 15 } 16 }
OperationSub(减法运算子类)
1 /** 2 * @author abo 3 * @title OperationSub 4 * @ProjectName Test 5 * @Description: 继承操作类,实现减法运算 6 * @CreateDate 2018-10-13 14:22 7 */ 8 public class OperationSub extends Operation { 9 @Override 10 public double getResult() { 11 double result = 0; 12 result = getNumberA()-getNumberB(); 13 return result; 14 } 15 }
OperationMul(乘法运算子类)
1 /** 2 * @author abo 3 * @title OperationMul 4 * @ProjectName Test 5 * @Description: 继承操作类,实现乘法运算 6 * @CreateDate 2018-10-13 14:23 7 */ 8 public class OperationMul extends Operation { 9 @Override 10 public double getResult() { 11 double result= 0; 12 result = getNumberA()*getNumberB(); 13 return result; 14 } 15 }
OperationDiv(除法运算子类)
1 /** 2 * @author abo 3 * @title OperationDiv 4 * @ProjectName Test 5 * @Description: 继承操作类,实现除法运算 6 * @CreateDate 2018-10-13 14:24 7 */ 8 public class OperationDiv extends Operation { 9 @Override 10 public double getResult() { 11 double result=0; 12 result = getNumberA()/getNumberB(); 13 return result; 14 } 15 }
OperationFactory(运算工厂类)
1 /** 2 * @author abo 3 * @title OperationFactory 4 * @ProjectName Test 5 * @Description: 简单运算工厂类,用于创建操作类对象 6 * @CreateDate 2018-10-13 14:26 7 */ 8 public class OperationFactory { 9 public static Operation createOperate(String operate){ 10 Operation operation = null; 11 switch(operate){ 12 case "+": 13 operation=new OperationAdd(); 14 break; 15 case "-": 16 operation=new OperationSub(); 17 break; 18 case "*": 19 operation=new OperationMul(); 20 break; 21 case "/": 22 operation=new OperationDiv(); 23 break; 24 } 25 return operation; 26 } 27 }
客户端程序Test类
1 Scanner scanner = new Scanner(System.in); 2 System.out.println("请输入第一个数字:"); 3 double numberA = scanner.nextDouble(); 4 System.out.println("请输入第二个数字:"); 5 double numberB = scanner.nextDouble(); 6 System.out.println("请输入操作符:如+、-、*、/"); 7 String operator = scanner.next(); 8 try { 9 Operation oper; 10 oper = OperationFactory.createOperate(operator); 11 oper.setNumberA(200); 12 oper.setNumberB(4); 13 System.out.println("结果为:"+oper.getResult()); 14 } catch (Exception e) { 15 e.printStackTrace(); 16 System.out.println("运算结果出错!"); 17 }
标签:客户端程序 factor xtend 客户端 creat script factory system.in desc
原文地址:https://www.cnblogs.com/SmilingFish/p/9784794.html