動態創造物件(Create a object dynamically)

目錄架構:

DemoObject : 單純的物件

 package dynamic;  
 public class DemoObject {  
      private int id ;  
      public int getId() {  
           return id;  
      }  
      public void setId(int id) {  
           this.id = id;  
      }  
 }  

Main.java : 程式執行的地方.

 package dynamic;  
 import java.io.IOException;  
 import java.util.Properties;  
 public class Main {  
      public static void main(String [] args) throws IOException{  
           Properties properties = new Properties();  
           properties.load(Main.class.getResourceAsStream("object_name.prop"));  
           String classFullName = (String) properties.get("objectName");  
           try {  
                Class clazz = Class.forName(classFullName);  
                DemoObject dObj = (DemoObject)clazz.newInstance();  
                dObj.setId(1);  
                System.out.println(dObj.getId());  
           } catch (ClassNotFoundException e) {  
                e.printStackTrace();  
           } catch (InstantiationException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
           } catch (IllegalAccessException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
           }  
      }  
 }  

object_name.prop : 用key - value 的方式記錄完整的類別名稱.

 objectName = dynamic.DemoObject