Question about loops

Question

hey guys,
with this piece of code here... right now I have it reading a dataSet and printing out the first Value out of 9 datapoints. How can I tweak this so that it would read through ALL 9 datapoints. I know i can do a loop but im not sure how to go about it!...
int numDataSets = dc.size(); // determine number of data sets in collection
      for (int i=0; i<numDataSets; i++) {
        dataSet ds = dc.get(i); // get the ith dataset
        String  filename = ds.sourceFileName;
        System.out.println("the number of DataSets: " + numDataSets);
        dataEl  el = ds.get(0); // get the 0th element of the ith dataset
        double value = el.getMainValue(); // get the associated main value
        int dateInt = el.getDateInt();
        //for (int dateInt=0; dateInt<0; dateInt++) {
        System.out.println("data set " + filename + ": value " + value + dateInt);
      }

Answer 1

You'd use a nested loop. It's no trouble to nest one loop inside another. Traditionally, if i is the index variable of the outer loop, then j is the index variable of the inner one.
By the way, if dc is a java.util.Collection (saying that it's a java.util.Collection means that it's a class that implements that interface, or implements a sub-interface of that interface), and if you're using JDK 1.5 or above, then you don't need to use an explicitly indexed for loop. You could just do this:
for(dataSet ds : dc) {
    // your code here
}And you could easily nest a similar loop inside of that.