[leetcode]Valid Number

问题描述:

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.

考虑：93.3f, 23.43D ， 2341234L等数字均为无效数字，数字中包含的字母只能是e

代码：

public class Valid_Number { //java
	 public boolean isNumber(String s) {
	        if(s == null || s.trim().isEmpty())
	        	return false;

	        s = s.trim().toLowerCase();
	        char ch = s.charAt(s.length()-1);
	        if(ch =='f' || ch =='l' || ch =='d')
	        	return false;
	        try{
	        	Double.valueOf(s);
	        	return true;
	        }catch(Exception e){
	        	return false;
	        }
	    }
}