Programming and Problem Solving with Java

CASE STUDY

570

{

Address resultAddress;

resultEntry = resultList.getNextItem(); // Get an entry

outFile.writeObject(resultEntry); // Write the entry

resultAddress = resultEntry.knowAddress();

labelFile.println(resultEntry.knowName().full());

labelFile.println(resultAddress.knowStreet());

labelFile.println(resultAddress.knowCity() + ","

+ resultAddress.knowState() + " "+ resultAddress.knowZip());

labelFile.println();

}

// Close files and exit

firstFile.close();

secondFile.close();

outFile.close();

labelFile.close();

}

static voidgenerateLists(ObjectInputStream inFile, SortedList list)

throwsIOException, ClassNotFoundException

{

EntryPlus entry;

booleanmoreData = true;

while(moreData)

{

try

{

entry = (EntryPlus)inFile.readObject();

list.insert(entry);

}

catch(EOFException except)

{

moreData = false;

}

}

}

}

Because EntryPlusdoes not implement Comparable, we need to change our Listclass

to call the compareTomethod associated with the Namefield in an item. We can access this

field using the knowNamemethod for the EntryPlusobject. Of course,sortedListwas also

written to use Stringitems, and must be changed so that items are EntryPlusobjects.

Testing MergeBooks required that we write a small program to enable us to create

data files and another program to view the name fields in the files. When you work

with files of serialized objects it is often necessary to write such helper programs as

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