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The Decimal Format class is a poorly explained class in the java Documentation so i will clear up a little of it with an example.

you first need to import the DecimalFormat class:


import java.text.DecimalFormat;


then create a format object. this object can be used with doubles, as it uses a decimal. It uses a template String to teach Java how to ouput the objects.
*This example will be used as a standard format of money:


DecimalFormat money = new DecimalFormat("$0.00");


Now that you have a money object. (declared either globally or locally) you can now format your objects
*Note this example uses only 2 decimal places and a $, but any symbols or length is available.

As an example of prniting a double value:


double amount = 4.333333333;
System.out.println(money.format(amount));



what will be printed is: $4.33 as described by the template, this handles your percision and dollar sign with a single template!