Iterating over a List of Strings In Java?

I am using OpenCSV to read data from a CSV file and am using some of the sample code from the homepage:

CSVReader reader = new CSVReader(new FileReader("stockInfo.csv"));
List myEntries = reader.readAll();

And i am now trying to loop through this list and print out each entry. But i cann开发者_运维技巧ot seem to figure out the code to perform this.

Could anyone explain to me how i am supposed to do this becuase i just cant seem to work it out.

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Assuming you want to output each entry of each line to it's own line:

    List<String[]> myEntries = reader.readAll();
    for (String[] lineTokens : myEntries) {
        for (String token : lineTokens) {
            System.out.println(token);
        }
    }

---

Can't you do: 1)

for(int i = 0; i < myEntries.size(); i++){
  myEntries.get(i); // do something else here
}

or

2)

for(String s: myEntries)
   // Do work on s here

---

Have you tried using an Iterator? It should be something like this:

Iterator it = myEntries.iterator();
while(it.hasNext()){
  System.out.println(it.next());
}

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You should be using generics with CSVReader if possible. readAll() actually returns a List<String[]> and not a List<String>. Then, you just need to:

for (String[] row : myEntries) {
  System.out.println(Arrays.toString(row));
}

---

You can do something of this effect. I've added synchronization on iterator.

List<String[]> myEntries = reader.readAll();
Iterator<String[]> iter = myEntries.iterator();
synchronized (iter) {
    while (iter.hasNext()) {
        String[] items = iter.next();

        for (String item: items) { //foreach loop
            //Work with `item`
        }
    }
}

---

In Java 8 and above you can also do

    List<String> s = new LinkedList<>();
    s.stream().forEach(System.out::print);

or

    List<String> s = new LinkedList<>();
    s.stream().forEach(s ->
            System.out.print(s)
    );

It is possible to use paralleStream() instead or stream() to make parallel execution. There are a lot of articles on the internet about which will execute quicker and the answer is : "it depends" (mostly on the number of items in the list)