格式化正/负双精度数，去掉小数点后的 0（如果存在）

Question

Is there a single, applicable statement that would format the following double examples as strings (in java)?

50 to appear as +50

-50.4 to appear as -50.4

Edit: If there's a 0 after the decimal point, I need it dropped. If anything other than a 0, then I need it left alone.

Answer 1

This seems to work:

DecimalFormat fmt = new DecimalFormat("+0.#;-0.#");
fmt.format(50.0);

Gives +50

fmt.format(-50.4);

Gives -50.4