public class TrimTest {
	
	public static void main(String[] args){
		String s = "1955";
		String regex = "[0-9]+";//正則表示式
		Pattern pattern = Pattern.compile(regex);
		Matcher matcher = pattern.matcher(s);
		Boolean b = matcher.matches();
		if(b){
			System.out.println("String is Digit！");
		}else{
			System.out.println("String is not Digit！");
		}
	}
}