chapter9n3.java

JAVA源代码程序aashjkjhkjhkjhjkhkj

/**
 *
 * demonstration of an array of objects
 *
 * Written by: Roger Garside
 *
 * First Written: 11/Oct/96
 * Last Rewritten: 11/Oct/96
 *
 */

import java.lancs.* ;

public class Chapter9n3
    {

    /**
     *
     * main
     *
     */

    public static void main(String[] args) throws Exception
        {
        Person[] personGroup = new Person[100] ;

	// read the data from the file "person.data"
        BasicFileIo file = new BasicFileIo(BasicFileIo.INPUT, "person.data") ;
        int noOfPersons = 0 ;
        while (true)
	    {
	    String fore = file.readString() ;
	    if (fore == null)
	        break ;
            String sur = file.readString() ;
	    int age = file.readInteger() ;
	    String x = file.readString() ;
	    int gender ;
	    if (x.equalsIgnoreCase("MALE"))
	        gender = Person.MALE ;
	    else if (x.equalsIgnoreCase("FEMALE"))
	        gender = Person.FEMALE ;
	    else
	        gender = Person.UNKNOWN ;
            personGroup[noOfPersons] = new Person(fore, sur, age, gender) ;
	    noOfPersons++ ;
	    }
        file.closeFile() ;

	// search for a specified surname
        BasicIo.prompt("Type the surname to be searched for: ") ;
        String surname = BasicIo.readString() ;
        int i = 0 ;
        while ((i < noOfPersons) &&
               (!personGroup[i].getSurname().equals(surname)))
	    i++ ;
        if (i == noOfPersons)
	    System.out.println("no such person") ;
        else
	    System.out.println("found a match at position " + i) ;

	// alternative search algorithm 1
        /* int i = noOfPersons - 1 ;
        while ((i != -1) &&
               (!personGroup[i].getSurname().equals(surname)))
	    i-- ;
        if (i == -1)
	    System.out.println("no such person") ;
        else
	    System.out.println("found a match at position " + i) ; */

	// alternative search algorithm 2
        /* int matchIndex = -1;
        int noOfMatches = 0 ;
        for (int i = 0 ; i < noOfPersons ; i++)
	   if (personGroup[i].getSurname().equals(surname))
	       {
	       matchIndex = i ;
	       noOfMatches++ ;
	       }
        System.out.println("no of matches is "+ noOfMatches) ;
        if (noOfMatches != 0)
	    System.out.println("last match was at " + matchIndex) ; */
        } // end of method main

    } // end of class Chapter9n3