Working with ZipInputStream object, how can available() return a 1 but read return a -1?

Guys here is the relevant code...

ZipInputStream zis = new ZipInputStream(zip.getInputStream(ze));
System.out.println(zis.available());
int count = zis.read(data,0,buffer);
System.out.println(count);

I continually get this as output... 1 -1

Now its my understandi开发者_Python百科ng that a 1 for available means it isn't at the end of the file and -1 returned from read means it is the end of the file. How can they both be true?

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It's only an 'estimate': see the Javadoc. Presumably in this case it is intended to signify that you should do a read to collect the EOS indication. There are very few correct uses of available() and I doubt that this is one of them.

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check if the value of 'buffer' passed to read method is less than or equal to 0 ?