Inheritance - Java - page 436

Display 7.7 EnhancedStringTokenizer (part 1 of 2)

1 import java.util.StringTokenizer;

2
3 public class EnhancedStringTokenizer extends StringTokenizer
4{
5 private String[] a;

6 private int count;

7 public EnhancedStringTokenizer(String theString)

8 {

The method countTokens is inherited
and is not overridden.

9 super (theString);

10 a = new String[countTokens()];

11 count = 0;

12 }

13 public EnhancedStringTokenizer(String theString, String delimiters)

14 {

15 super (theString, delimiters);

16 a = new String[countTokens()];

17 count = 0;

18 }

19 /**

20 Returns the same value as the same method in the StringTokenizer class,

21 but it also stores data for the method tokensSoFar to use.

22 */

This method nextToken has its definition
overridden.

23 public String nextToken()

24 {

25 String token = super .nextToken();

26 a[count] = token;

super.nextTokens is the version of
nextToken defined in the base class
StringTokenizer . This is explained
more fully in Section 7.3.

27 count++;

28 return token;

29 }

30 /**

31 Returns the same value as the same method in the StringTokenizer class,

32 changes the delimiter set in the same way as does the same method in the

33 StringTokenizer class, but it also stores data for the method tokensSoFar to use.

34 */

35 public String nextToken(String delimiters)

This method nextToken also
has its definition overridden.

36 {

37 String token = super .nextToken(delimiters);

38 a[count] = token;

39 count++;

super.nextTokens is the version of nextToken
defined in the base class StringTokenizer .

40 return token;

41 }