带有多个参数的 Java string.format 整体宽度

Question

I'm trying to format a string using Java's String.format . I need to create a string like this: "<padding spaces> int1 / int2" .

Right now I have the following format: " %1$d/%2$d10" or "%1$d10/%2$" (or just "%1$d/%2$d" , without the width setting) but this is not working correctly. I want to have the string aligned to the right, with empty spaces as padding for a total width of 10.

I'm using "%1$10.1f" elsewhere in my code, for a single float. The double integers need to be padded to the same width.

I have googled my brains out, but am unable to find a way to pad the total string instead of the two individual integers. Help would be appreciated!

Answer 1

Create the double integer string first using:

int one = 1;
int two = 2;
String dints = String.format("%d / %d", one, two);

Then format the string dints with a width of 10:

String whatYouWant = String.format("%10s", dints);

Printing whatYouWant should output:

     1 / 2

You can also do it in one call, at the cost of readability, for instance:

String whatYouWant = String.format("%10s", String.format("%d / %d", one, two));

Or shorter:

String whatYouWant = String.format("%10s", one + " / " + two);