How does Java Integer get the first and last bits and intercept them?

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Integer gets the first and last bits and intercepts the scene

Get 5, 10, 15, 25, 30; enter the judgment if the Mantissa is 5.

Public static void main (String [] args) {String str = "data test, custom field"; / / determine whether the first character is "if" (str.startsWith ("number")) {str = str.substring (1) } / / determine whether the last character is "segment" if (str.endsWith ("paragraph")) {str = str.substring (0 System.out.println str.length ()-1);} System.out.println (str);} ingenious method of calculating the number of Integer digits

Today, I found it interesting to see the java source code.

Final static int [] sizeTable = {9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 99999999, Integer.MAX_VALUE}; / / Requires positive x static int stringSize (int x) {for (int iTuno;; iTunes +) if (x