Right Align String NumberFormat in Java

Question

I need to right align an input string of digits with a mask using plus symbols.

For example:

    String input = "893";
    String mask = "&&&&&&";

should return

    String output = "+++893";

I'm very confused on how to implement this with NumberFormat and or DecimalFormat as I haven't used them before. Any help would be appreciated.

Answer 1

If you need to use DeciamlFormat you could use:

int input = 893;
DecimalFormat decFormat = new DecimalFormat("000000"); //as many palces as you need
String output = decFormat.format(input);

And then replace all leading zeros with + sign.

String.format("%06d", input); //also gives you leading zeros 

You still have to check if the output is too long, if you always want 6 places.

Answer 2

您可以尝试以下操作：如果遮罩的长度大于输入的长度，请求差并在输入的前面添加许多加号。