valid bank money number

import java.util.ArrayList;
import java.util.List;


public class test {

    /**
     * @param args
     */
    public static Boolean isNum(String s){
        if(s == null || s.length()==0)
            return false;
        s = s.trim();
        
        //check the ,, situation 
        String[] t = s.split(",");
        int comcount = 0;
        for(int i=0;i<t.length;i++){
            if(s.charAt(i)==‘,‘)
                comcount++;
        }
        if(t.length!=comcount+1)
            return false;
        
        if(t.length==1)
            return Valid(t[0], true, true);
        else 
        {
            for(int i=0; i< t.length;i++){
                if(i==0){
                    if(!Valid(t[i], true, true))
                        return false;
                }
                else if(i==(t.length-1)){
                    if(!Valid(t[i],false,true))
                        return false;
                }else{
                    if(!Valid(t[i],false,false))
                        return false;
                }
                
            }
        }
        return true;
    }
//    //effective fractional 100.222222
//    public static boolean Valid2(String s){
//        if(s.length() == 0)
//            return false;
//    }
//    
    public static Boolean Valid(String s, boolean f, boolean l){
        if(f){
        
            
            //+10234  -00234
            if(s.length()>0 && (s.charAt(0)==‘-‘ || s.charAt(0)==‘+‘))
                s = s.substring(1);
            char[] arr = s.toCharArray();
            if(arr.length==0)
                return false;
            int indexDot = s.indexOf(".");
            if(indexDot ==-1){
                //23     333
                if(s.length()>3)
                    return false;
            }else{
                if(indexDot>3)
                    return false;
                for(int i=0;i<indexDot;i++){
                    if(!check(s.charAt(i)))
                        return false;
                }
                if(indexDot==s.length()-1)
                    return false;
                for(int i=indexDot+1;i<s.length();i++){
                    if(!check(s.charAt(i)))
                        return false;
                }
            }
            
        
            return true;
        }
        if(l){
            if(s.length()<3)
                return false;
            for(int i=0;i<3;i++)
            {
                if(!check(s.charAt(i)))
                    return false;
            }    
            if(s.length()>3){
                if(s.charAt(3)!=‘.‘)
                    return false;
                for(int i=4;i<s.length();i++){
                    if(!check(s.charAt(i)))
                        return false;
                }
            }
            return true;
        }
        // middle
        if(s.length()!=3)
                return false;
        char[] arr = s.toCharArray();
        for(int i=0;i<arr.length;i++){
            if(!check(arr[i]))
                    return false;
        }
        
        return true;
    }
    
    static boolean check(char c){
        return (‘0‘ <= c && c <= ‘9‘);
    }
    
    public static void main(String[] args) {
        
        String[]t = {",,","100,002",",000.3",
                "+34444","9999.234324","234234",
                "+56.234234","1,000,000,030.21231","-0.3242",
                ".+99","1111.6",",999.3"
                ,"+1,000,987.23444444444"
                };
        for(String c:t)
        System.out.println(isNum(c));
    }

}