我正在使用 SAX 解析 XML 文件，但是当我在类上调用类加载器时，java.lang.InstantiationException会抛出 a。
我调试了这个异常的原因，'当应用程序尝试使用类 Class 中的 newInstance 方法创建类的实例时抛出，但指定的类对象无法实例化，因为它是接口或抽象类。 '
但是location该类不是接口或抽象类。我还检查了该类是否在正确的包中，并且确实如此。
有谁知道为什么在这种情况下会引发异常？
在 Parser 类的 startElement 中的第一个 println 之后抛出异常：
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
if (qName.equals("location")){
location = true;
System.out.println("Found a location...");
//exception thrown after this statement as shown
//in the error output below
try {
//Read in the values for the attributes of the element <location>
int locationID = Integer.parseInt(atts.getValue("id"));
String locationName = atts.getValue("name");
//Generate a new instance of Location on-the-fly using reflection. The statement Class.forName("gmit.Location").newInstance(); invokes the
//Java Class Loader and the calls the null (default) constructor of Location.
Location loc = (Location) Class.forName("gmit.Location").newInstance();
loc.setId(locationID); //Now configure the Location object with an ID, Name, Description etc...
loc.setName(locationName);
} catch (Exception e) {
e.printStackTrace();
}
}else if (qName.equals("description")){
description = true;
System.out.println("Found a description. You should tie this to the last location you encountered...");
}else if (qName.equals("exits")){
exits = true;
System.out.println("Found an exit. You should tie this to the last location you encountered...");
}else if (qName.equals("item")){
item = true;
System.out.println("Found an item. You should tie this to the last game-character you encountered if the boolean gameCharacter flag is true...");
}else if (qName.equals("game-character")){
gameCharacter = true;
System.out.println("Found a game character...");
}else if (qName.equals("search-algorithm")){
searchAlgorithm = true;
System.out.println("Found a search algo. You should tie this to the last game-character you encountered if the boolean gameCharacter flag is true...");
}
}
我完整的位置类：
http://hastebin.com/yofuyafipe.java
运行时抛出的错误：