“IllegalFormatConversionException: d != java.lang.String” when padding number with 0s?

Question

I had a perfectly working code yesterday, in the exact form of:

int lastRecord = 1;
String key = String.format(\"%08d\", Integer.toString(lastRecord));


        

Answer 1

You don't need the Integer.toString():

 newPK = String.format("%08d", lastRecord);

String.format() will do the conversion and the padding.

Answer 2

Very late to the party.

If you still are facing an issue to the String.format(); code even after implementing accepted answer.

This did not work for me:

String.format("%08d", stringvariable);

Because of two reasons:

1. It will not work as d will expect for decimal point not string.
2. Use %8d instead of %08d as formatter did not work for me if I used this %08d

If you are using String based Variable with String data. Use this.

String.format("%8s", stringvariable);