java反射簡單一實例_java

本文執行個體講述了java反射簡單實現方法。分享給大家供大家參考。具體實現方法如下：

複製代碼 代碼如下:

package reflect;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;

interface fruit{
 public abstract void eat() ;
}
class Apple implements fruit{

 public void eat() {
  System.out.println("eat Apple");
 }
 
}
class orange implements fruit{

 public void eat() {
  System.out.println("eat orange");
 }
 
}
class init{
 public static Properties getPro() throws FileNotFoundException, IOException{
  Properties pro = new Properties() ;
  File f = new File("fruit.properties") ;
  if(f.exists()){
   System.out.println("有設定檔！");
   //從設定檔中讀取索引值對
   pro.load(new FileInputStream(f)) ;
  }else{
   System.out.println("沒有設定檔！");
   pro.setProperty("apple", "reflect.Apple") ;
   pro.setProperty("orange", "reflect.orange") ;
   pro.store(new FileOutputStream(f), "FRUIT CLASS");
  }
  return pro ;
 }
}
class Factory{
 public static fruit getInstance(String className){
  fruit f = null ;
  try {
   //通過反射得到fruit的執行個體對象
   f = (fruit)Class.forName(className).newInstance();
  } catch (InstantiationException e) {
   e.printStackTrace();
  } catch (IllegalAccessException e) {
   e.printStackTrace();
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }
  return f ;
 }
}
public class Hello {
 public static void main(String[] args) {
  try {
   Properties pro = init.getPro() ;
   fruit f = Factory.getInstance(pro.getProperty("apple")) ;
   if(f != null){
    f.eat() ;
   }
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}

結果為：

有設定檔！
eat Apple

希望本文所述對大家的java程式設計有所協助。