请教一个java语法问题

[wangbo1204]

请问：
1，Throwable的子类如何在构造器中接受一个cause对象作为参数来创建异常链
2，异常中 initCause方法怎么理解 它怎样和其他的异常链连接起来
希望能举个例子
谢谢

[schumiXsuse]

public class YourException extends Throwable
{
/**
*
*/
private static final long serialVersionUID = 6553677709090L;

public YourException()
{
super();
}

public YourException(String message)
{
super(message);
}

public YourException(Throwable cause)
{
super(cause);
}

public YourException(String message, Throwable cause)
{
super(message, cause);
}
}


public class YourBussinessClass......
{
public void method(LoaderTaskInformation taskInfo) throws YourException
{
logger.info("............");
..........
try
{
xxx//would throw xxxExcetpion
}
catch (xxxExcetpion e)
{
//logger.error(e);
throw new YourException(e);
}
}

[bt_lose]

Throwable的子类中添加一个 构造方法,
public class A extends Throwable{
public A(Cause cause){
//...........
}
}