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When I try to split a String around occurrences of "." the method split returns an array of strings with length 0.When I split around occurrences of "a" it works fine.Does anyone know why?Is split not supposed to work with punctuation marks?
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The split() method splits a string into an array of substrings. The split() method returns the new array. The split() method does not change the original string. If (" ") is used as separator, the string is split between words.
You can split a string by each character using an empty string('') as the splitter. In the example below, we split the same message using an empty string. The result of the split will be an array containing all the characters in the message string.
To split a string with space as delimiter in Java, call split() method on the string object, with space " " passed as argument to the split() method. The method returns a String Array with the splits as elements in the array.
split takes regex. Try split("\\.").
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String a = "a.jpg";
String str = a.split(".")[0];
This will throw ArrayOutOfBoundException because split accepts regex arguments and "." is a reserved character in regular expression, representing any character. Instead, we should use the following statement:
String str = a.split("\\.")[0]; //Yes, two backslashes
When the code is compiled, the regular expression is known as "\.", which is what we want it to be
Here is the link of my old blog post in case you are interested: http://junxian-huang.blogspot.com/2009/01/java-tip-how-to-split-string-with-dot.html
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