异常处理

11.11

今天练溪的是异常处理连：

代码部分：

/**
* 自定义的异常类
* @author JinXuLiang
*
*/
class MyException extends Exception
{
public MyException(String Message)
{
super(Message);
}
public MyException(String message, Throwable cause)
{
super(message, cause);
}
public MyException( Throwable cause)
{
super(cause);
}

}

public class ExceptionLinkInRealWorld
{
public static void main( String args[] )
{
try
{
throwExceptionMethod(); //有可能抛出异常的方法调用
}
catch ( MyException e )
{
System.err.println( e.getMessage() );
System.err.println(e.getCause().getMessage());
}
catch ( Exception e )
{
System.err.println( "Exception handled in main" );
}
doesNotThrowException(); //不抛出异常的方法调用
}

public static void throwExceptionMethod() throws MyException
{

try
{
System.out.println( "Method throwException" );

throw new Exception("系统运行时引发的特定的异常"); // 产生了一个特定的异常
}
catch( Exception e )
{
System.err.println(
"Exception handled in method throwException" );
//转换为一个自定义异常，再抛出
throw new MyException("在方法执行时出现异常",e);

}
finally
{
System.err.println(
"Finally executed in throwException" );
}

// any code here would not be reached
}

public static void doesNotThrowException()
{
try
{
System.out.println( "Method doesNotThrowException" );
}
catch( Exception e )
{
System.err.println( e.toString() );
}
finally
{
System.err.println(
"Finally executed in doesNotThrowException" );
}

System.out.println(
"End of method doesNotThrowException" );
}
}

 这就是典型的异常处理代码模板。