How to format decimals in a currency format?

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I’d recommend using the java.text package: 

double money = 100.1;
NumberFormat formatter = NumberFormat.getCurrencyInstance();
String moneyString = formatter.format(money);
System.out.println(moneyString);

This has the added benefit of being locale specific.

But, if you must, truncate the String you get back if it’s a whole dollar: 

if (moneyString.endsWith(".00")) {
    int centsIndex = moneyString.lastIndexOf(".00");
    if (centsIndex != -1) {
        moneyString = moneyString.substring(1, centsIndex);
    }
}

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