How to Convert Float to String and String to Float in Java?

What is the proper way to convert a float to a String and vice versa in Java?

String sSelectivityRate = String.valueOf(valueCalculated);

Converting between float and String types in Java is a common requirement in many programs. Understanding how to perform these conversions accurately is crucial, especially when comparing values from different types. Below, we explore the methods to convert both ways, discuss potential pitfalls, and how to address them.

// Converting float to String
String sSelectivityRate = String.valueOf(valueCalculated);  

// Converting String to float
try {
    Float parsedValue = Float.parseFloat(valueFromTable);
} catch (NumberFormatException e) {
    // Handle exception if parsing fails
    System.out.println("Invalid string format: " + e.getMessage());
}

Causes

• The float value might have more decimal precision than the string representation.
• There might be a mismatch in the expected format of the string being parsed.

Solutions

• Ensure that the string representation of the float matches the expected format (e.g., correct decimal places).
• Use methods such as `Float.parseFloat()` for converting a String to a float, while ensuring proper exception handling.

Mistake: Trying to directly compare a float and String value without conversion.

Solution: Always convert both values to a comparable type before making comparisons.

Mistake: Not handling NumberFormatException when parsing a String to float.

Solution: Use a try-catch block to handle exceptions that may arise during parsing.