10 Fundamental Classes


10.1
 /**  * Aggregate pairs of arbitrary objects.  */ public final class Pair {     private Object first, second;     /** Construct a Pair object. */     public Pair(Object one, Object two) {         first = one;         second = two;     }     /** Provides access to the first aggregated object. */     public Object getFirst() { return first; }     /** Provides access to the second aggregated object. */     public Object getSecond() { return second; }     /** @return true if the pair of objects are identical. */     public boolean equals(Object other) {         if (! (other instanceof Pair)) return false;         Pair otherPair = (Pair) other;         return first.equals(otherPair.getFirst()) &&                second.equals(otherPair.getSecond());     }     /** @return a hash code for the aggregate pair. */     public int hashCode() {         // XORing the hash codes to create a hash code for the pair.         return first.hashCode() ^ second.hashCode();     }     /** @return the textual representation of aggregated objects. */     public String toString() {         return "[" + first + "," + second + "]";     } } 
10.2
 public class Palindrome {     public static void main(String[] args) {         if (args.length != 1) {             System.out.println("Usage: java Palindrome <word>");             return;         }         String word = args[0];         StringBuffer reverseWord = new StringBuffer(word);         reverseWord.reverse();         boolean isPalindrome = word.equals(reverseWord.toString());         System.out.println("The word " + word + " is " +                             (isPalindrome ? "" : "not ") +                             "a palindrome");     } } 


A Programmer[ap]s Guide to Java Certification
A Programmer[ap]s Guide to Java Certification
ISBN: 201596148
EAN: N/A
Year: 2003
Pages: 284

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