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java Programming Glossary: string.charatHow do I find out if first character of a string is a number? http://stackoverflow.com/questions/1223052/how-do-i-find-out-if-first-character-of-a-string-is-a-number string share improve this question Character.isDigit string.charAt 0 Note that this will allow any Unicode digit not just 0 9... any Unicode digit not just 0 9. You might prefer char c string.charAt 0 isDigit c '0' c '9' Or the slower regex solutions s.substring..
Given a length and a set of characters, how to get all the possible string combinations [duplicate] http://stackoverflow.com/questions/12288836/given-a-length-and-a-set-of-characters-how-to-get-all-the-possible-string-combi i 0 i string.length i String newResult new String result string.charAt i String newString new String string.substring 0 i string.substring..
jTextField accept only alphabet and white space http://stackoverflow.com/questions/14058505/jtextfield-accept-only-alphabet-and-white-space we iterate from the back its 'aad' like we want char c string.charAt n 1 get a single character of the string System.out.println..
How to Auto Calculate input numeric values of Text Field in JAVA http://stackoverflow.com/questions/14174776/how-to-auto-calculate-input-numeric-values-of-text-field-in-java String string for int n 0 n string.length n char c string.charAt n get a single character of the string System.out.println c..
What is a good 64bit hash function in Java for textual strings? http://stackoverflow.com/questions/1660501/what-is-a-good-64bit-hash-function-in-java-for-textual-strings prime int len string.length for int i 0 i len i h 31 h string.charAt i return h If you're looking for even more bits you could probably..
Fastest way to iterate over all the chars in a String http://stackoverflow.com/questions/8894258/fastest-way-to-iterate-over-all-the-chars-in-a-string 32 bit For strings 1 to 256 characters in length calling string.charAt i wins with an average processing of 13.4 million to 588 million..
How to allow introducing only digits in jTextField? [duplicate] http://stackoverflow.com/questions/9477354/how-to-allow-introducing-only-digits-in-jtextfield true for int i 0 i len i if Character.isDigit string.charAt i isValidInteger false break if isValidInteger super.insertString.. true for int i 0 i len i if Character.isDigit string.charAt i isValidInteger false break if isValidInteger super.replace..
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