转载:https://blog.csdn.net/u013066244/article/details/53197756 用JAVA自带的函数 public static boolean isNumericZidai(String str) { for (int i = 0; i < str.length(); i++) { System.out.println(str.charAt(i)); if (!Character.isDigit(str.charAt(i))) { return fal
推荐使用第二个方法,速度最快. 方法一:用JAVA自带的函数 public static boolean isNumeric(String str){ for (int i = str.length();--i>=0;){ if (!Character.isDigit(str.charAt(i))){ return false; } } return true; } public static boolean isNumeric(String str){ for (int i = str.len