原因:出现这种情况一般是workspace的配置文件中出现了.lock文件（workspace/.metadata/.lock），锁定了workspace。把.lock文件删除即可。
如果该文件不能删除，可能是因为javaw.exe进程未结束，结束该进程及eclipse.exe进程即可删除。
正常情况下，如果你打开了一个workspace,在想打开另一个workspace也会出现上面的提示
打开Eclipse提示“The default workspace “xxxx” is in use or cannot be created Please choose a different one“
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