Here is an example of double datatype to show some of its possible decimal values.

import java.text.*;

class ShowDecimalPlaces 
{
    public static void main(String[] args) 
    {
        double d=345.678;
        DecimalFormat df=new DecimalFormat();
        df.applyPattern("#0.00000");
        System.out.println(df.format(d));

        df.applyPattern("#0.0000");
        System.out.println(df.format(d));

        df.applyPattern("#0.000");
        System.out.println(df.format(d));

        df.applyPattern("#0.00");
        System.out.println(df.format(d));

        df.applyPattern("#0.0");
        System.out.println(df.format(d));
    }
}

printing decimal Java example