Java for in (forin) with generic Collection


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Java 1.5 'Tiger': A Developer's Notebook (O'Reilly) 
by Brett McLaughlin and David Flanagan.
ISBN: 0-596-00738-8

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import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ForInGenericsDemo {

  public static void main(String[] args) {

    // These are collections we'll iterate over below.
    List<String> wordlist = new ArrayList<String>();
    Set<String> wordset = new HashSet<String>();

    // We start with a basic loop over the elements of an array.
    // The body of the loop is executed once for each element of args[].
    // Each time through one element is assigned to the variable word.
    System.out.println("Assigning arguments to lists...");
    for(String word : args) {
      System.out.print(word + " ");
      wordlist.add(word);
      wordset.add(word);
    }

    System.out.println();

    // Iterate through the elements of the List now.
    // Since lists have an order, these words should appear as above
    System.out.println("Printing words from wordlist " +
      "(ordered, with duplicates)...");
    for(String word : wordlist) {
      System.out.print(word + " ");
    }

    System.out.println();

    // Do the same for the Set. The loop looks the same but by virtue of
    // using a Set, we lose the word order and also discard duplicates.
    System.out.println("Printing words from wordset " +
      "(unordered, no duplicates)...");
    for(String word : wordset) {
      System.out.print(word + " ");
    }
  }
}

1.	Foreach Array
2.	Simple demo to print all the types of an enum
3.	Foreach and generic data structure
4.	Use a foreach(for each) style for loop.
5.	Use break with a foreach(for each) style for.
6.	The foreach(for each) loop is essentially read-only.
7.	Use foreach(for each) style for on a two-dimensional array.
8.	Search an array using foreach(for each) style for.
9.	Using a foreach(for each) for loop with a collection.
10.	Using a foreach(for each) for loop on an Iterable object.
11.	Java for In(forin) Tester
12.	Java for in (forin) with Collection
13.	Java for in (forin): line-by-line iteration through a text file

Java for in (forin) with generic Collection : Foreach « Language Basics « Java

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