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.

public class Solution {
   public boolean isNumber(String s) {
    	String strim=s.trim();
    	if(strim.length()==0) return false;
    	if(strim.charAt(0)=='e'||strim.charAt(strim.length()-1)=='e') return false;
    	String strs[] = strim.split("e");
    	if(strs.length>2) return false;
    	for(int i=0;i<strs.length;i++){
    		String string = strs[i];
    		int spot = 0;
    		int num = 0;
    		if(string.length()==1&&(string.charAt(0)=='+'||string.charAt(0)=='-')) return false;
    		for(int j=0;j<string.length();j++){
    			char c = string.charAt(j);
    			if(c=='.'){
    			    if(i==1) return false;
    				spot++;
    			}else if(c>'9'||c<'0'){
    				if(j==0&&(c=='-'||c=='+')) continue;
    				return false;
    			}else{ 
    				num++;
    			}
    		}
    		if(num==0||spot>1) return false;
    		String li[] = string.split("\\.");
    		if(li.length==0||li.length>2) return false;
    	}
    	return true;
    }
}

[LeetCode]Valid Number