public static void main(String[] args) { int a = 8; String s = String.format("%04d", a); System.out.println(s); } length代表的是格式化后字符串的总长度d是个占位符,会被参数a所替换.0是在arr转化为字符后,长度达不到length的时候,前面以0补足.…
转载:http://www.csharp-examples.net/string-format-double/ he following examples show how to format float numbers to string in C#. You can use static method String.Format or instance methods double.ToString and float.ToString. Digits after decimal point…