package com.simpleFactory;
/**
* 運算類
* @author Administrator
*
*/
public class Operation {
private double numberA;
private double numberB;
public double getResultValue(){
return 0.0;
}
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;
}
}
package com.simpleFactory;
/**
* 加法實現方式
* @author Administrator
*
*/
public class Addition extends Operation {
@Override
public double getResultValue() {
return getNumberA() + getNumberB();
}
}
package com.simpleFactory;
/**
* 減法實現方式
* @author Administrator
*
*/
public class Subtracter extends Operation {
@Override
public double getResultValue() {
return getNumberA() - getNumberB();
}
}
package com.simpleFactory;
/**
* 簡單工廠類
* @author Administrator
*
*/
public class SimpleFactory {
private Operation operation;
public Operation factoryOperate (String type ){
if ("+".equals(type)){
operation = new Addition();
}
else if ("-".equals(type)){
operation = new Subtracter();
}
return operation;
}
}
package com.simpleFactory;
/**
* 簡單工廠類 ,利用反射實現
* @author Administrator
*
*/
public class SimpleFactory_reflect {
private Operation operation;
public Operation factoryOperate (String classType ){
try {
operation = (Operation)Class.forName("com.simpleFactory."+classType).newInstance();
} catch (Exception e) {
e.printStackTrace();
}
return operation;
}
}
package com.simpleFactory;
public class MainRun {
public static void main(String[] args) {
SimpleFactory factory = new SimpleFactory();
Operation operation = factory.factoryOperate("-");
operation.setNumberA(12);
operation.setNumberB(16);
//double returnVale = operation.getResultValue();
// System.out.println("returnVale = "+returnVale);
// 利用反射，每次增加新的運算時，不用更改工廠類
SimpleFactory_reflect factory_reflect = new SimpleFactory_reflect();
operation = factory_reflect.factoryOperate("Addition");
operation.setNumberA(12);
operation.setNumberB(16);
double returnVale = operation.getResultValue();
System.out.println("returnVale = "+returnVale);
}
}