的XPath产生混乱的输出，而不是Unicode字符

我解析这个XML文件：的XPath产生混乱的输出，而不是Unicode字符

<?xml version="1.0" encoding="UTF-8"?> 

<tests> 
    <test category="Русский"/> 
    <test category="ελληνικά"/> 
    <test category="中文"/> 
    <test category="English"/> 
</tests>

主类是：

import java.io.File; 
import java.io.FileInputStream; 
import javax.xml.xpath.XPath; 
import javax.xml.xpath.XPathConstants; 
import javax.xml.xpath.XPathExpression; 
import javax.xml.xpath.XPathFactory; 
import org.w3c.dom.NodeList; 
import org.xml.sax.InputSource; 

public class TestUnicode { 
    public static void main(String[] args) throws Exception { 
     XPath xpath = XPathFactory.newInstance().newXPath(); 
     XPathExpression lolwhy = xpath.compile("//test"); 
     final InputSource inputSource = 
       new InputSource(
       new FileInputStream(
       new File("sample.xml"))); 
     NodeList parent = (NodeList) lolwhy.evaluate(
       inputSource, 
       XPathConstants.NODESET); 
     System.out.println(parent.getLength()); 
     for (int i = 0; i < parent.getLength(); i++) { 
      System.out.println(parent.item(i).getAttributes(). 
        getNamedItem("category").getNodeValue()); 
     } 
    } 
}

，输出是：