Why is this an issue?

Rather than creating a boxed primitive from a String to extract the primitive value, use the relevant parse method instead. It will be clearer and more efficient.

Noncompliant code example

String myNum = "12.2";

float f = (new Float(myNum)).floatValue();  // Noncompliant; creates & discards a Float

Compliant solution

String myNum = "12.2";

float f = Float.parseFloat(myNum);