/**
?*?A?simple?program?demonstrating?file?locking.
?*?This?program?acquires?an?exclusive?lock?on?the
?*?first?half?of?the?file?and?a?shared?lock?on?the?second?half.
?*
?*?Usage
?*	java?LockingExample?
?*
?*?Figure?11.2
?*
?*?@author?Gagne?Galvin?Silberschatz
?*?Operating?System?Concepts?-?Ninth?Edition
?*?Copyright?John?Wiley?&?Sons?-?2013.
?*/

import?java.io.*;
import?java.nio.channels.*;

public?class?LockingExample?{
	public?static?final?boolean?EXCLUSIVE?=?false;
	public?static?final?boolean?SHARED?=?true;

???public?static?void?main（String?args[]）?throws?IOException?{
	if?（args.length?!=?1）?{
		System.err.println（“Usage:?java?LockingExample?“）;
		System.exit（0）;
	}

	FileLock?sharedLock?=?null;
	FileLock?exclusiveLock?=?null;

	try?{
?????		RandomAccessFile

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2013-05-17?14:55??final-src-osc9e\
?????文件????????6148??2013-05-17?14:55??final-src-osc9e\.DS_Store
?????目錄???????????0??2013-05-17?14:57??__MACOSX\
?????目錄???????????0??2013-05-17?14:57??__MACOSX\final-src-osc9e\
?????文件??????????82??2013-05-17?14:55??__MACOSX\final-src-osc9e\._.DS_Store
?????目錄???????????0??2013-01-08?15:24??final-src-osc9e\ch11\
?????文件??????????46??2003-10-25?10:35??final-src-osc9e\ch11\lockfile.txt
?????目錄???????????0??2013-05-17?14:57??__MACOSX\final-src-osc9e\ch11\
?????文件?????????202??2003-10-25?10:35??__MACOSX\final-src-osc9e\ch11\._lockfile.txt
?????文件????????1823??2013-01-04?13:39??final-src-osc9e\ch11\LockingExample.java
?????文件?????????202??2013-01-04?13:39??__MACOSX\final-src-osc9e\ch11\._LockingExample.java
?????文件?????????789??2003-10-25?11:53??final-src-osc9e\ch11\README
?????文件?????????202??2003-10-25?11:53??__MACOSX\final-src-osc9e\ch11\._README
?????目錄???????????0??2013-01-08?15:24??final-src-osc9e\ch12\
?????文件??????????32??2013-01-08?13:01??final-src-osc9e\ch12\file1.txt
?????文件??????????33??2013-01-08?13:01??final-src-osc9e\ch12\file3.txt
?????目錄???????????0??2013-01-08?15:24??final-src-osc9e\ch17\
?????文件?????????693??2013-01-08?13:50??final-src-osc9e\ch17\DNSLookUp.java
?????目錄???????????0??2013-05-17?14:57??__MACOSX\final-src-osc9e\ch17\
?????文件?????????202??2013-01-08?13:50??__MACOSX\final-src-osc9e\ch17\._DNSLookUp.java
?????目錄???????????0??2013-01-08?15:24??final-src-osc9e\ch2\
?????文件?????????154??2012-12-17?13:28??final-src-osc9e\ch2\Makefile
?????文件?????????549??2012-12-17?13:29??final-src-osc9e\ch2\simple.c
?????目錄???????????0??2013-01-08?15:24??final-src-osc9e\ch3\
?????文件?????????711??2012-12-17?13:50??final-src-osc9e\ch3\DateClient.java
?????目錄???????????0??2013-05-17?14:57??__MACOSX\final-src-osc9e\ch3\
?????文件?????????202??2012-12-17?13:50??__MACOSX\final-src-osc9e\ch3\._DateClient.java
?????文件?????????811??2012-12-17?13:50??final-src-osc9e\ch3\DateServer.java
?????文件?????????202??2012-12-17?13:50??__MACOSX\final-src-osc9e\ch3\._DateServer.java
?????文件?????????443??2012-12-17?14:05??final-src-osc9e\ch3\fork-question-1.c
?????文件?????????379??2012-12-17?14:08??final-src-osc9e\ch3\fork-question-2.c
............此處省略46個文件信息