判断String是否为数值，包括小数和负数

public static void main(String[] args) {Boolean strResult = "100".matches("-[0-9]+(.[0-9]+)?|[0-9]+(.[0-9]+)?");  if(strResult == true) {              System.out.println("Is Number!");          } else {              System.out.println("Is not Number!");          }  }