[LANG-1444] NumberUtils.createNumber() does not create BigDecimal for decimal fractions tending to zero

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.8.1
• Component/s: lang.math.*
• Assignee: Unassigned
• Reporter: Costa Theodosiou
• Created: 08/Apr/19 04:28
• Updated: 18/May/23 12:18

Description

The following code demonstrates the issue:

System.out.println(NumberUtils.createNumber("1.1").getClass().getName());
System.out.println(NumberUtils.createNumber("1.001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.00001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.0000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.000000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.00000000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.0000000000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.000000000000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.00000000000000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.0000000000000000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.000000000000000000001").getClass().getName());
System.out.println(NumberUtils.createNumber("1.00000000000000000000001").getClass().getName());

will print:

java.lang.Float
java.lang.Float
java.lang.Float
java.lang.Float
java.lang.Double
java.lang.Double
java.lang.Double
java.lang.Double
java.lang.Float
java.lang.Float
java.lang.Float
java.lang.Float

It seems the problem is towards the bottom of the createNumber method that compares the float to double string representation:

f.toString().equals(d.toString())

For the misbehaving tests, the string "1.0".equals("1.0")