Java String.indexOf and empty Strings
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Published on 2010-04-21T13:50:41Z
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2010/04/21
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I'm curious why the String.indexOf is returning a 0 (instead of -1) when asking for the index of an empty string within a string.
The Javadocs only say this method returns the index in this String of the specified string, -1 if the string isn't found.
System.out.println("FOO".indexOf("")); // outputs 0 wtf!!!
System.out.println("FOO".indexOf("bar")); // outputs -1 as expected
System.out.println("FOO".indexOf("F")); // outputs 0 as expected
System.out.println("".indexOf("")); // outputs 0 as expected, I think
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