Java How to Program Fourth Edition - DCC

930 Files and Streams Chapter 16
33 // ensure that name is proper length
34 private String padName( RandomAccessFile file )
35 throws IOException
36 {
37 char name[] = new char[ 15 ], temp;
38
39 for ( int count = 0; count < name.length; count++ ) {
40 temp = file.readChar();
41 name[ count ] = temp;
42 }
43
44 return new String( name ).replace( '\0', ' ' );
45 }
46
47 // write a record to specified RandomAccessFile
48 public void write( RandomAccessFile file ) throws IOException
49 {
50 file.writeInt( getAccount() );
51 writeName( file, getFirstName() );
52 writeName( file, getLastName() );
53 file.writeDouble( getBalance() );
54 }
55
56 // write a name to file; maximum of 15 characters
57 private void writeName( RandomAccessFile file, String name )
58 throws IOException
59 {
60 StringBuffer buffer = null;
61
62 if ( name != null )
63 buffer = new StringBuffer( name );
64 else
65 buffer = new StringBuffer( 15 );
66
67 buffer.setLength( 15 );
68 file.writeChars( buffer.toString() );
69 }
70
71 // NOTE: This method contains a hard coded value for the
72 // size of a record of information.
73 public static int size()
74 {
75 return 72;
76 }
77
78 } // end class RandomAccessAccountRecord
Fig. Fig. Fig. 16.11 16.11 16.11 RandomAccessAccountRecord class used in the random-access file
programs (part 2 of 2).
Class RandomAccessAccountRecord inherits AccountRecord’s (Fig. 16.5)
implementation, which includes private instance variables—account, lastName,
firstName and balance—as well as their public set and get methods.