TIOBE - Java Coding Standard

Rule: Basic29

Synopsis:	Don't create instances of already existing BigInteger and BigDecimal (ZERO, ONE, TEN)
Language:	Java
Severity Level:	5
Category:	Basic

Description:

Don't create instances of already existing BigInteger (BigInteger.ZERO, BigInteger.ONE) and for 1.5 on, BigInteger.TEN and BigDecimal (BigDecimal.ZERO, BigDecimal.ONE, BigDecimal.TEN)

public class Test {

 public static void main(String[] args) {
   BigInteger bi=new BigInteger(1);
   BigInteger bi2=new BigInteger("0");
   BigInteger bi3=new BigInteger(0.0);
   BigInteger bi4;
   bi4=new BigInteger(0);
 }
}

Justification:

Avoid creating unnecessary new instance when there is already one(e.g. BigDecimal.ZERO). BigDecimal.ZERO will never change because BigDecimal is an immutable class.