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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; }

As we described earlier in this chapter, the familiar example is the act of moving money from a savings account to a checking account The customer thinks of the act as a single action, but the database must take two actions The database must reduce the balance in the savings account, and increase the balance in the checking account If the first action should succeed, and the second fail (perhaps the computer fails at that instant), the customer will be very unhappy, for their savings account will contain less and their checking account will contain what it did The customer would prefer that both actions be successful, but if the second action fails, the customer wants to be sure that everything will be put back as it was initially Either every change must be successful, or no change must occur.

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A hash table (also called a map, a lookup table, an associative array, or a dictionary) is a container that allows direct access by any index type. It works like an array or vector except that the index variable need not be an integer. A good analogy is a dictionary; the index variable is the word being looked up, and the element that it indexes is its dictionary definition. A table is a sequence of pairs. The first component of the pair is called the key. It serves as the index into the table, generalizing the subscript integer used in arrays. The second component is called the value of its key component. It contains the information being looked up. In the dictionary example, the key is the word being looked up, and the value is that word s definition (and everything else listed for that word). A table is also called a map because we think of the keys being mapped into their values, like a mathematical function: f(key) = value. Tables are also called an associative arrays because they can be implemented using two parallel arrays; the keys in one array and the Figure 8.1 The Map classes of the JCF values in the other. THE JAVA Map INTERFACE The Java Collections Framework includes a Map interface, as shown in Figure 8.1. It is defined in the java.util package like this:

public interface Map { int size(); boolean isEmpty(); boolean containsKey(Object key); boolean containsValue(Object value); Object get(Object key); Object put(Object key, Object value); Object remove(Object key); void putAll(Map map); void clear();

Database management systems allow the user (or programmer) to specify transaction boundaries Every change to the database that occurs within the transaction boundaries must be successful, or the transaction will be rolled back When a transaction is rolled back, the values of all columns in all rows will be restored to the values they had when the transaction began Transactions are implemented using write-ahead logging Changes to the database, along with the previous values, are written to the log, not to the database, as the transaction proceeds When the transaction is completely successful, it is committed At that point the changes previously written to the log are actually written to the database, and the changes become visible to other users On the other hand, if any part of the transaction fails, for any reason, the changes are rolled back, ie.

communication as a tool for gaining support, Obama has displayed great personal charisma. He takes steps to form a strong first impression and to leverage excellent second impressions. Obama also employs effective gestures, skillfully uses props, gets off to strong beginnings, and conveys admirable ethics. This chapter explores these practices, which have enabled Barack Obama to earn the trust and confidence of millions of supporters both at home and abroad.

CHAP. 8]

public Set keySet(); public Collection values(); public Set entrySet(); public interface Entry { Object getKey(); Object getValue(); Object setValue(Object value); boolean equals(Object o); int hashCode(); } boolean equals(Object o); int hashCode(); }

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