使用Lists - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-06-26
| just as with a // Collection, but you can also use random // access with get(): public static void print(List a) { for(int i = 0; i < a.size(); i++) System.out.print(a.get(i) + " "); System.out.println(); } static boolean b; static Object o; static int i; static Iterator it; static ListIterator lit; public static void basicTest(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 void iterMotion(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 void iterManipulation(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 void testVisual(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: ListI |
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