80      * @params slot  the slot in the shutdown hook array, whose element
  81      *               will be invoked in order during shutdown
  82      * @params registerShutdownInProgress true to allow the hook
  83      *               to be registered even if the shutdown is in progress.
  84      * @params hook  the hook to be registered
  85      *
  86      * @throw IllegalStateException if shutdown is in progress and
  87      *          the slot is not valid to register.
  88      */
  89     void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook);
  90 
  91     /**
  92      * Returns the number of stack frames represented by the given throwable.
  93      */
  94     int getStackTraceDepth(Throwable t);
  95 
  96     /**
  97      * Returns the ith StackTraceElement for the given throwable.
  98      */
  99     StackTraceElement getStackTraceElement(Throwable t, int i);





















 100 }

  80      * @params slot  the slot in the shutdown hook array, whose element
  81      *               will be invoked in order during shutdown
  82      * @params registerShutdownInProgress true to allow the hook
  83      *               to be registered even if the shutdown is in progress.
  84      * @params hook  the hook to be registered
  85      *
  86      * @throw IllegalStateException if shutdown is in progress and
  87      *          the slot is not valid to register.
  88      */
  89     void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook);
  90 
  91     /**
  92      * Returns the number of stack frames represented by the given throwable.
  93      */
  94     int getStackTraceDepth(Throwable t);
  95 
  96     /**
  97      * Returns the ith StackTraceElement for the given throwable.
  98      */
  99     StackTraceElement getStackTraceElement(Throwable t, int i);
 100 
 101     /**
 102      * Returns a string backed by the provided character array. The character
 103      * array must not be modified after the string is created in order to
 104      * fulfill String's contract.
 105      *
 106      * @param chars the character array to back the string.
 107      * @return a newly created string whose content is the character array.
 108      */
 109     String createStringSharedChars(char[] chars);
 110 
 111     /**
 112      * Format a long (treated as unsigned) into a character buffer.
 113      * @param val the unsigned long to format
 114      * @param shift the log2 of the base to format in (4 for hex, 3 for octal, 1 for binary)
 115      * @param buf the character buffer to write to
 116      * @param offset the offset in the destination buffer to start at
 117      * @param len the number of characters to write
 118      * @return the lowest character  location used
 119      */
 120     int formatUnsignedLong(long val, int shift, char[] buf, int offset, int len);
 121 }