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並前往https://forum.processing.org/two/discussion/23275/determine-if-a-string-is-numeric-only-int-not-float-but-minus-sign-allowed.html

determine if a String is numeric (only int, not float, but minus ...

https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html ... isInteger("123.67"); isInteger("9876"); } boolean isInteger(String s) { boolean ...

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