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abstract class Animal    //¶¨Òå³éÏóÀà
{
    String str;
    Animal(String s)     //¶¨Òå³éÏóÀàµÄÒ»°ã·½·¨
   {
        str=s;
   }
    abstract void eat();      //¶¨Òå³éÏó·½·¨
}
class Horse extends Animal     //¶¨Òå¼Ì³ÐAnimalµÄ×ÓÀà
{  
    String str;
    Horse(String s)
   {
      super(s);      //µ÷Óø¸ÀàµÄ¹¹Ôì·½·¨
   }
    void eat()      //ÖØÐ´¸¸ÀàµÄ³éÏó·½·¨
   {     
      System.out.println("Âí³Ô²ÝÁÏ£¡");
   }
}
class Dog extends Animal
{
    String str;
    Dog(String s)
   {
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publicd class syncTest {

synchronized void aMethod() {
//ÐèҪͬ²½Ê¹ÓõĴúÂë
}

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package test;
import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
public class XmlTest {
 public static void main(String[] args) {
  File xmlFile=new File("test/xml.xml");
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