Conditional Number Formatting In Java

问题

How can I format Floats in Java so that the float component is displayed only if it's not zero? For example:

123.45 -> 123.45
99.0   -> 99
23.2   -> 23.2
45.0   -> 45

Edit: I forgot to mention - I'm still on Java 1.4 - sorry!

回答1:

If you use DecimalFormat and specify # in the pattern it only displays the value if it is not zero.

See my question How do I format a number in java?

Sample Code

 DecimalFormat format = new DecimalFormat("###.##");

    double[] doubles = {123.45, 99.0, 23.2, 45.0};
    for(int i=0;i<doubles.length;i++){
        System.out.println(format.format(doubles[i]));
    }

回答2:

Check out the DecimalFormat class, e.g. new DecimalFormat("0.##").format(99.0) will return "99".

回答3:

new Formatter().format( "%f", myFloat )

来源：https://stackoverflow.com/questions/54487/conditional-number-formatting-in-java