// Java 1.5 Tiger A Developers Notebook Brett McLaughlin and David Flanagan

// Goal is to save unnecessary type casting
// Make code more type safe with Generics
// Support Unicode 4.0 which defines characters that don't fit in 16 bit
//    Character.isUppercase() ... that takes int

// StringBuilder which can be used instead of StringBuffer when code is not multithreaded





import java.util.Arrays;
import java.util.Comparator;
import java.util.Queue;
import java.util.PriorityQueue;
//import java.lang.System.out;
import java.util.LinkedList;

public class Tiger1
{

  public static void arrays()
  {
    int[] foo1 = new int[] { 1, 2, 3};
    System.out.println(Arrays.toString(foo1));
    int[][] foo2 = new int[][] { {1, 2}, {3, 4} };
    System.out.println(Arrays.deepToString(foo2));
    int[][] foo3 = (int[][]) foo2.clone();
    System.out.println(Arrays.deepToString(foo3));
    if (Arrays.deepEquals(foo2, foo3))
       System.out.println("deep equal");
    int hashCode = Arrays.deepHashCode(foo2);
  }

  public static void queues()
  {
	System.out.println("Queues");
    Queue q = new LinkedList(); // Queue is an interface implemented by LinkedList
    q.add("1"); q.add("2"); q.offer("3");
    Object o;
    o = q.peek();
    while ((o = q.poll()) != null) System.out.println(o);
    q.remove();
  }

  public static void priorityQueue()
  {
    PriorityQueue pq = new PriorityQueue(3, new Comparator()
      {
		public int compare(Object i, Object j)
		{
		  Integer i1 = (Integer) i;
		  Integer i2 = (Integer) j;
		  return i1.intValue() < i2.intValue() ? 1 : -1;
		}
	  });
    pq.offer(new Integer(1)); pq.offer(new Integer(2)); pq.offer(new Integer(3));
    Object o;
    while ((o = pq.poll()) != null)  System.out.println(o);

  }

  public static void main(String[] args)
  {

    arrays();
    queues();
    priorityQueue();

  }
}


// covaraint return
class foo1 {  }
class foo2 extends foo1 {}

class use1 {  foo1 getfoo() { return new foo1(); } }
class use2 {  foo2 getfoo() { return new foo2(); } }