import java.text.NumberFormat;

public class RoundEx{

	public String rounded(String str) {
		if (str != null) {
			if (str.equalsIgnoreCase("0.0") || str.equalsIgnoreCase("NaN")
					|| str.equalsIgnoreCase("0") || str.equalsIgnoreCase("N/A"))
				return ".";
			if (!isNumber(str)){ // if not a number: mod on 27th,Mar,07
				return str;
			}//if
			try {
				NumberFormat numberFormat = NumberFormat.getNumberInstance();
				numberFormat.setMaximumFractionDigits(2);
				numberFormat.setGroupingUsed(false);//if it is true, we will get like 2,1345
				return numberFormat.format(Double.parseDouble(str));
			} catch (Exception e) {
				System.out.println("Numberformat error for the string value:"
						+ str);
				e.printStackTrace();
			}// catch
		}// if(str!=null
		return "--";
	}// public String rounded(String..

	public static boolean isNumber(String str) {//mod on 27th,Mar,07
		str.trim();
		if(str.equals(".")||str.equals("")||str.equals("-")||str.equals("-.")){//eg: "." or "" or "-."
			return false;
		}//if
		int dotCount=0;
		for(int i=0;i<str.length();i++){
			char ch=str.charAt(i);
			if(ch>='0' && ch<='9'){				
			}else if(ch=='.' && dotCount<1){
				dotCount++;
			}else if((ch=='-'||ch=='+')&&i==0){//minus/plus should be in first position				
			}else{
				return false;
			}//else
		}//for(int i=0;..
		return true;
	}// public boolean isNumber(..


	public static void main(String[] args) {
		RoundEx obj=new RoundEx();
		String s="36542365.2365";
		
		System.out.println(isNumber(s));

		System.out.println("Rounded value "+obj.rounded(s));
	}//main
}// class