Accessing Databases Using JDBC - Java Programming: Comprehensive Concepts and Techniques - page 769

1
2 public class Errors implements Serializable
3 {
4 private Connection con = null ;

5
6 public Errors () throws ClassNotFoundException , SQLException

7 {

8 String url = "jdbc:odbc:StockTracker" ;

9 Class .forName ( "sun.jdbc.odbc.JdbcOdbcDriver" ) ;

10 con = DriverManager .getConnection ( url ) ;

11 }

12
13 public byte [] serializeObj ( Object obj ) throws IOException

14 {

15 ByteArrayOutputStream baOStream = new ByteArrayOutputStream () ;

16 ObjectOutputStream objOStream = new ObjectOutputStream ( baOStream ) ;

17
18 objOStream.writeObject ( obj ) ;

19 objOStream.flush () ;

20 objOStream.close () ;

21 return baOStream.toByteArray () ;

22 }

23
24
25

(a)

1 A:\Chapter11\Errors.java:2: cannot resolve symbol
2 symbol : class Serializable
3 location: class Errors
4 public class Errors implements Serializable
5 ^
6 A:\Chapter11\Errors.java:4: cannot resolve symbol
7 symbol : class Connection
8 location: class Errors
9 private Connection con = null;
10 ^
11 A:\Chapter11\Errors.java:6: cannot resolve symbol
12 symbol : class SQLException
13 location: class Errors
14 public Errors() throws ClassNotFoundException,SQLException
15 ^
16 A:\Chapter11\Errors.java:13: cannot resolve symbol
17 symbol : class IOException
18 location: class Errors
19 public byte[] serializeObj(Object obj) throws IOException
20 ^
21 A:\Chapter11\Errors.java:10: cannot resolve symbol
22 symbol : variable DriverManager
23 location: class Errors
24 con = DriverManager.getConnection(url);
25 ^
26 A:\Chapter11\Errors.java:15: cannot resolve symbol
27 symbol : class ByteArrayOutputStream
28 location: class Errors
29 ByteArrayOutputStream baOStream = new
ByteArrayOutputStream();
30 ^
31 A:\Chapter11\Errors.java:15: cannot resolve symbol
32 symbol : class ByteArrayOutputStream
33 location: class Errors
34 ByteArrayOutputStream baOStream = new

ByteArrayOutputStream();

35 ^

36 A:\Chapter11\Errors.java:16: cannot resolve symbol
37 symbol : class ObjectOutputStream
38 location: class Errors
39 ObjectOutputStream objOStream = new ObjectOutputStream(baOStream);
40 ^
41 A:\Chapter11\Errors.java:16: cannot resolve symbol
42 symbol : class ObjectOutputStream
43 location: class Errors
44 ObjectOutputStream objOStream = new ObjectOutputStream(baOStream);

45 ^

46 9 errors
47
48 Tool completed with exit code 1
49

(b)

FIGURE 11-78