題目：

Validate if a given string is numeric.

Some examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true

Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before implementing one.

思路：

正則表達式

package others;public class ValidNumber {public boolean isNumber(String s) {return s.matches("^\\s*[+-]?(\\d+|\\d*\\.\\d+|\\d+\\.\\d*)([eE][+-]?\\d+)?\\s*$");}public static void main(String[] args) {// TODO Auto-generated method stubValidNumber v = new ValidNumber();System.out.println(v.isNumber("3.1"));System.out.println(v.isNumber("- 8.9"));System.out.println(v.isNumber("2."));System.out.println(v.isNumber("abc"));System.out.println(v.isNumber("e10"));System.out.println(v.isNumber("5e10"));}}

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