How to Convert Between Float and String in Java for Accurate Comparisons?

Converting Between Float and String in Java

When comparing values retrieved from different sources in Java, it becomes essential to convert between data types for accurate comparisons. This article focuses on converting between float and string data types, addressing the specific issue of comparing a string value from a database table with a calculated float value.

To convert a float to a string, utilize Java's valueOf() method from the String class. Replace the placeholder variable valueCalculated with the float value you want to convert:

<code class="java">String sSelectivityRate = String.valueOf(valueCalculated);</code>

For conversions from string to float, use the parseFloat() method from the Float class. Replace the placeholder variable valueFromTable with the string value you want to convert:

<code class="java">float f = Float.parseFloat(valueFromTable);</code>

However, for comparison purposes, it's recommended to convert the string to a float rather than comparing as strings. This is because strings have multiple representations for the same float value, leading to false negatives when compared directly. Consider the following:

<code class="java">"25" != "25.0" != "25.00"</code>

Therefore, by converting the string to a float using parseFloat() and then comparing it with the calculated float value, you can ensure accurate assertions.

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