vb.net print barcode zebra public double valueAt(double x) // returns the y-value of p at the specified x-value in Java

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public double valueAt(double x) // returns the y-value of p at the specified x-value
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Write and test this method for the Polynomial class:
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public Polynomial times(double factor) // returns a new polynomial that is equal to this polynomial
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Answers to Review Questions
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7.1 The List interface includes these 10 methods that work with indexes:
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public public public public public void boolean Object int int add(int index, Object object); addAll(int index, Collection collection); get(int index); indexOf(Object object); lastIndexOf(Object object);
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[CHAP. 7
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ListIterator ListIterator Object Object List
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listIterator(); listIterator(int index); remove(int index); set(int index, Object object); subList(int start, int stop);
7.2 7.3
The AbstractList class implements the methods of the List interface, including the 10 index methods listed above in the answer to Question 7.1 which are not in the AbstractCollection class. The AbstractSequentialList class is designed to serve as a base class for linked list classes. It specifies the two abstract methods listIterator() and size() which must be implemented by any concrete subclass. The ListIterator class extends the Iterator class in a way that is analogous to the way the AbstractSequentialList class extends the AbstractList class. (See the answer to Question 7.2 above.) Ordinary Iterator objects are unidirectional iterators that iterate on array lists; ListIterator objects are bidirectional iterators that iterate on linked lists. Instances of the ArrayList class use contiguous, indexed, direct access (array) storage. Instances of the LinkedList class use linked (sequential) access storage. So array lists provide faster access, while linked lists provide faster modifications (insertions and removals). There isn t much difference between an ArrayList object and a Vector object: They both provide direct indexed access. As part of the Java Collections Framework, the ArrayList class was introduced more recently, in Java 1.2, and so it is probably more preferred. The Vector class has about twice as many methods, but many are redundant and consequently a bit confusing. An ArrayList object should be preferred when frequent lookups are expected. A LinkedList object should be preferred when frequent additions and/or removals are expected. (See the answer to Question 7.6 above.)
Solutions to Problems
void loadRandomLetters( LinkedList list, int n) { list.clear(); while (0 < n--) list.add("" + (char)('A' + (int)(Math.random()*26))); } void printForward(LinkedList list) { for (ListIterator itr=list.listIterator(); itr.hasNext(); ) System.out.println(itr.next()); } void printBackward(LinkedList list) { ListIterator itr=list.listIterator(list.size()); while (itr.hasPrevious()) System.out.println(itr.previous()); } void exchange(LinkedList list, int i, int j) { Object ithObj = list.get(i); Object jthObj = list.get(j) ; list.set(i,jthObj); list.set(j,ithObj); }
The solution to the generalized Josephus Problem:
public class Josephus public static final public static final public static final { int SOLDIERS = 11; int SKIP = 2; String ALPHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
CHAP. 7]
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public static void main(String[] args) { Ring<String> ring = new Ring<String>(); for (int i=0; i<SOLDIERS; i++) { ring.add(ALPHA.substring(i, i+1)); } System.out.println(ring); Iterator<String> it = ring.iterator(); String killer = it.next(); String victim = null; while (ring.size() > 1) { for (int i = 0; i <= SKIP; i++) { victim = it.next(); } if (victim == killer) { victim = it.next(); } System.out.println(killer + " killed " + victim); it.remove(); killer = it.next(); } System.out.println("The lone survivor is " + it.next()); } }
public double valueAt(double x) { // returns the y-value p(x) of p at the specified x-value // This implements Horner's method. if (this.isZero()) { return 0.0; } ListIterator<Term> it = list.listIterator(); Term term = null; while (it.hasNext()) { // move to last element term = it.next(); } term = it.previous(); double y = term.coef; int n = term.exp; while (it.hasPrevious()) { term = it.previous(); y *= Math.pow(x, n - term.exp); y += term.coef; n = term.exp; } y *= Math.pow(x, n); return y; } public Polynomial times(double factor) { // returns a new polynomial that is equal to this polynomial if (this.isZero() || factor == 0.0) { return ZERO; } Polynomial p = new Polynomial(this); for (Term t : p.list) { t.coef *= factor; } return p; }
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