How Can I Elegantly Format Floating-Point Numbers in Java Without Unnecessary Decimal Zeros?

Formatting Floating Numbers Elegantly without Extraneous Decimal Zeros

In the realm of Java programming, formatting floating-point numbers can present challenges, especially when dealing with a mix of integers stored as doubles and actual doubles. The default formatting method, String.format("%f"), often introduces trailing zeros for small values, distorting the desired output.

One solution is to employ a custom formatting method that distinguishes between integers and doubles. This can be achieved through conditional evaluation:

public static String fmt(double d) {
    if (d == (long) d)
        return String.format("%d", (long) d);
    else
        return String.format("%s", d);
}

This method returns integers as integers and doubles with the minimum necessary precision, yielding the desired output:

232
0.18
1237875192
4.58
0
1.2345

By utilizing conditional formatting, this approach avoids performance penalties associated with string manipulation and ensures accurate representation of both integer and double values.

Caution: Note that string formatting in Java can be locale-dependent, so the provided solution may need to be adjusted accordingly based on the locale settings of your application.

The above is the detailed content of How Can I Elegantly Format Floating-Point Numbers in Java Without Unnecessary Decimal Zeros?. For more information, please follow other related articles on the PHP Chinese website!