Round up decimal but put zero for round up less tha N.

Question

eg. I have
a = 2.003473
b = 2.2
and I want to round up to 4 decimal.
output expectation .
a = 2.0034
b = 2.2000
how to get value for b?

Answer 1

b=2.2;
Formatter fmt=new Formatter();
fmt.format("%.4f",b);
print(fmt);
output:
2.2000

Answer 2

If you want to only print up to a certain decimal place, you can use:
System.out.printf("%4f",a);