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List1.javaAPI DocExample7082Mon Apr 06 18:10:26 BST 1998c08.newcollections

List1

public class List1 extends Object

Fields Summary
static boolean
b
static Object
o
static int
i
static Iterator
it
static ListIterator
lit
Constructors Summary
Methods Summary
public static voidbasicTest(java.util.List a)

    a.add(1, "x"); // Add at location 1
    a.add("x"); // Add at end
    // Add a collection:
    a.addAll(fill(new ArrayList()));
    // Add a collection starting at location 3:
    a.addAll(3, fill(new ArrayList())); 
    b = a.contains("1"); // Is it in there?
    // Is the entire collection in there?
    b = a.containsAll(fill(new ArrayList()));
    // Lists allow random access, which is cheap
    // for ArrayList, expensive for LinkedList:
    o = a.get(1); // Get object at location 1
    i = a.indexOf("1"); // Tell index of object
    // indexOf, starting search at location 2:
    i = a.indexOf("1", 2);
    b = a.isEmpty(); // Any elements inside?
    it = a.iterator(); // Ordinary Iterator
    lit = a.listIterator(); // ListIterator
    lit = a.listIterator(3); // Start at loc 3
    i = a.lastIndexOf("1"); // Last match 
    i = a.lastIndexOf("1", 2); // ...after loc 2
    a.remove(1); // Remove location 1
    a.remove("3"); // Remove this object
    a.set(1, "y"); // Set location 1 to "y"
    // Keep everything that's in the argument
    // (the intersection of the two sets):
    a.retainAll(fill(new ArrayList()));
    // Remove elements in this range:
    a.removeRange(0, 2);
    // Remove everything that's in the argument:
    a.removeAll(fill(new ArrayList()));
    i = a.size(); // How big is it?
    a.clear(); // Remove all elements
  
public static java.util.Listfill(java.util.List a)

    return (List)Collection1.fill(a);
  
public static voiditerManipulation(java.util.List a)

    ListIterator it = a.listIterator();
    it.add("47");
    // Must move to an element after add():
    it.next();
    // Remove the element that was just produced:
    it.remove(); 
    // Must move to an element after remove():
    it.next();
    // Change the element that was just produced:
    it.set("47");
  
public static voiditerMotion(java.util.List a)

    ListIterator it = a.listIterator();
    b = it.hasNext();
    b = it.hasPrevious();
    o = it.next();
    i = it.nextIndex();
    o = it.previous();
    i = it.previousIndex();
  
public static voidmain(java.lang.String[] args)

    // Make and fill a new list each time:
    basicTest(fill(new LinkedList()));
    basicTest(fill(new ArrayList()));
    iterMotion(fill(new LinkedList()));
    iterMotion(fill(new ArrayList()));
    iterManipulation(fill(new LinkedList()));
    iterManipulation(fill(new ArrayList()));
    testVisual(fill(new LinkedList()));
    testLinkedList();
  
public static voidprint(java.util.List a)

    for(int i = 0; i < a.size(); i++)
      System.out.print(a.get(i) + " ");
    System.out.println();
  
public static voidtestLinkedList()

    LinkedList ll = new LinkedList();
    Collection1.fill(ll, 5);
    print(ll);
    // Treat it like a stack, pushing:
    ll.addFirst("one");
    ll.addFirst("two");
    print(ll);
    // Like "peeking" at the top of a stack:
    System.out.println(ll.getFirst());
    // Like popping a stack:
    System.out.println(ll.removeFirst());
    System.out.println(ll.removeFirst());
    // Treat it like a queue, pulling elements
    // off the tail end:
    System.out.println(ll.removeLast());
    // With the above operations, it's a dequeue!
    print(ll);
  
public static voidtestVisual(java.util.List a)

    print(a);
    List b = new ArrayList();
    fill(b);
    System.out.print("b = ");
    print(b);
    a.addAll(b);
    a.addAll(fill(new ArrayList()));
    print(a);
    // Shrink the list by removing all the 
    // elements beyond the first 1/2 of the list
    System.out.println(a.size());
    System.out.println(a.size()/2);
    a.removeRange(a.size()/2, a.size()/2 + 2);
    print(a);
    // Insert, remove, and replace elements
    // using a ListIterator:
    ListIterator x = a.listIterator(a.size()/2);
    x.add("one"); 
    print(a);
    System.out.println(x.next());
    x.remove();
    System.out.println(x.next());
    x.set("47");
    print(a);
    // Traverse the list backwards:
    x = a.listIterator(a.size());
    while(x.hasPrevious())
      System.out.print(x.previous() + " ");
    System.out.println();
    System.out.println("testVisual finished");