DecimalFormat not working in Java

[polaris90]

I'm writing this program to read data from yahoo finances and read the stock market values. The problem is that the values have 6 decimal places so I decided to use DecimalFormat to get a double with only 2 decimal places but it keeps displaying 6 decimal places.


//import java.io.BufferedReader;import java.io.IOException;
import java.net.URL;
import java.text.DecimalFormat;
import java.util.Scanner;


public class DataRead {


public static void main(String[] args) {


Scanner sc;// to read the raw data from the site
String str;// used to read a single line from the scanner
URL url;//url to read the data from the site
// get historical data first
try {


// Create a URL for the desired page
url = new URL("http://real-chart.finance.yahoo.com/table.csv?s=GOOG&d=9&e=16&f=2015&g=d&a=9&b=15&c=2014&ignore=.csv");


// Read all the text returned by the server/site
// BufferedReader in = new BufferedReader(new
// InputStreamReader(url.openStream()));
sc = new Scanner(url.openStream());

System.out.println("historical data");
//read first line for column titles
str = sc.nextLine();
String[] singleValues = str.split(",");
for(int i = 0; i<singleValues.length; i++){
System.out.print(" " + singleValues[i]);
}

System.out.println();

while (sc.hasNextLine()){
str = sc.nextLine();
singleValues = str.split(",");
for(int i = 0; i < singleValues.length; i++){

String s = singleValues[i];

if(i>0){

//change values to 2 decimal places
double x = Double.parseDouble(s);
DecimalFormat df = new DecimalFormat("#.##");

//s = String.format("%.02f", x);
//x = Double.parseDouble(s);
df.format(x);

System.out.print(x+" ");//Double.parseDouble(s) + " ");
}
else
System.out.printf("%-15s", s);
}
System.out.println();

}
sc.close();
} catch (IOException e){
e.printStackTrace();
}

System.out.println("\ncurrent data");


}
}

sample run

historical data
Date Open High Low Close Volume Adj Close
2015-10-16 664.109985 664.969971 657.200012 662.200012 1606100.0 662.200012
2015-10-15 654.659973 663.130005 654.460022 661.73999 1830500.0 661.73999
2015-10-14 653.210022 659.390015 648.849976 651.159973 1412000.0 651.159973
2015-10-13 643.150024 657.812012 643.150024 652.299988 1790700.0 652.299988
2015-10-12 642.090027 648.5 639.01001 646.669983 1275200.0 646.669983
2015-10-09 640.0 645.98999 635.317993 643.609985 1648700.0 643.609985



it works if I do it like this, but it seems unnecessary given the API already being written
double x = Double.parseDouble(s);
s = String.format("%.02f", x);x = Double.parseDouble(s);

I could simply format the string and print it using format above but I want the double value so I can pass it to another object. Can anybody point at what I'm doing wrong when formatting the values?

[PaulM1985]

In your line System.out.print(x+ " ") x here is a double, so you are printing a double to double precision, which is why you are getting the output you are seeing. You should be printing the output of the decimal format function:
System.out.print(df.format(x) + " ")

Paul

[polaris90]

Thanks PaulM1985, I see what you mean. I thought the number would get formatted and then I would be able to print it with the decimal format. Thanks for your comment