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int i = 1;
String s = Double.valueOf (i / 1000.0).toString(); // s contains 0.0010
if(s.equals("0.001")) { // Fails
  // Do something
}

Noncompliant Code Example

This noncompliant code example attempts to use a regular expression to eliminate the trailing zeros. However, even though this works for 1/1000.0, for 1/10000.0, it produces the string 1.0E-4. Subsequent comparison operations can still fail.

int i = 1;
String s = Double.valueOf (i / 10000.0).toString(); // s contains 0.0010
s = s.replaceFirst("[.0]*$", "");
// ...

Compliant Solution

This compliant solution uses the BigDecimal class and strips the trailing zeros so that future operations do not fail.

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