How to Convert Between Floats and Strings in Java?

Converting Data Types in Java: Float to String and vice versa

When working with different data types in Java, it becomes necessary to convert between them. Specifically, converting from float to string or vice versa is a common scenario.

Converting Float to String

To convert a float to a string, utilize the String.valueOf() method. This method takes a float as input and returns its string representation. For example:

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

Converting String to Float

To convert a string to a float, use the Float.parseFloat() method. This method takes a string representation of a float and returns a float value. For example:

<code class="java">float f = Float.parseFloat("25");</code>

Assertion Failure Explanation

In your case, the assertion failed because you compared a string (valueFromTable) with a float (valueCalculated) directly. When comparing values of different types, it's crucial to convert them to the same type, as there may be subtle differences in their string representations.

Improved Assertion

To fix the assertion, convert the valueFromTable string to a float first:

<code class="java">float floatValueFromTable = Float.parseFloat(valueFromTable);
if (floatValueFromTable == valueCalculated) {
    // Assertion passed
}</code>

This will convert both valueFromTable and valueCalculated to floats, ensuring accurate comparison.

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