java lang Throwable printStackTrace(PrintWriters)方法打印此抛出其回溯到指定的打印writer。1语法publicvoidprintStackTrace(PrintWrite
java lang Throwable printStackTrace(PrintStreams)方法打印此抛出其回溯到指定的打印流。1语法publicvoidprintStackTrace(PrintStreams)2
java lang Throwable printStackTrace()方法打印此抛出其回溯到标准错误流。它打印这个Throwable对象的堆栈跟踪有关错误输出流是作为字段Sy