Look for particular sequences in sentences
// : c12:AnalyzeSentence.java
// Look for particular sequences in sentences.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.util.StringTokenizer;
public class AnalyzeSentence {
public static void main(String[] args) {
analyze("I am happy about this");
analyze("I am not happy about this");
analyze("I am not! I am happy");
analyze("I am sad about this");
analyze("I am not sad about this");
analyze("I am not! I am sad");
analyze("Are you happy about this?");
analyze("Are you sad about this?");
analyze("It's you! I am happy");
analyze("It's you! I am sad");
}
private static StringTokenizer st;
private static void analyze(String s) {
System.out.println("\nnew sentence >> " + s);
boolean sad = false;
st = new StringTokenizer(s);
while (st.hasMoreTokens()) {
String token = next();
// Look until you find one of the
// two starting tokens:
if (!token.equals("I") && !token.equals("Are"))
continue; // Top of while loop
if (token.equals("I")) {
String tk2 = next();
if (!tk2.equals("am")) // Must be after I
break; // Out of while loop
else {
String tk3 = next();
if (tk3.equals("sad")) {
sad = true;
break; // Out of while loop
}
if (tk3.equals("not")) {
String tk4 = next();
if (tk4.equals("sad"))
break; // Leave sad false
if (tk4.equals("happy")) {
sad = true;
break;
}
}
}
}
if (token.equals("Are")) {
String tk2 = next();
if (!tk2.equals("you"))
break; // Must be after Are
String tk3 = next();
if (tk3.equals("sad"))
sad = true;
break; // Out of while loop
}
}
if (sad)
System.out.println("Sad detected");
}
static String next() {
if (st.hasMoreTokens()) {
String s = st.nextToken();
System.out.println(s);
return s;
} else
return "";
}
} ///:~
Related examples in the same category
1. | String Region Match Demo | | |
2. | Palindrome | | |
3. | Strings -- extract printable strings from binary file | | |
4. | Java Search String | | |
5. | Java String endsWith | | |
6. | Java String startsWith | | |
7. | Search a substring Anywhere | | |
8. | Starts with, ignore case( regular expressions ) | | |
9. | Ends with, ignore case( regular expressions ) | | |
10. | Anywhere, ignore case( regular expressions ) | | |
11. | Searching a String for a Character or a Substring | | |
12. | Not found returns -1 | | |
13. | If a string contains a specific word | | |
14. | Not found | | |
15. | if a String starts with a digit or uppercase letter | | |
16. | Search a String to find the first index of any character in the given set of characters. | | |
17. | Search a String to find the first index of any character not in the given set of characters. | | |
18. | Searches a String for substrings delimited by a start and end tag, returning all matching substrings in an array. | | |
19. | Helper functions to query a strings end portion. The comparison is case insensitive. | | |
20. | Helper functions to query a strings start portion. The comparison is case insensitive. | | |
21. | Wrapper for arrays of ordered strings. This verifies the arrays and supports efficient lookups. | | |
22. | Returns an index into arra (or -1) where the character is not in the charset byte array. | | |
23. | Returns an int[] array of length segments containing the distribution count of the elements in unsorted int[] array with values between min and max (range). | | |
24. | Returns the next index of a character from the chars string | | |
25. | Finds the first index within a String, handling null. | | |
26. | Finds the last index within a String from a start position, handling null. | | |
27. | Finds the n-th index within a String, handling null. | | |
28. | Case insensitive check if a String ends with a specified suffix. | | |
29. | Case insensitive check if a String starts with a specified prefix. | | |
30. | Case insensitive removal of a substring if it is at the begining of a source string, otherwise returns the source string. | | |
31. | Case insensitive removal of a substring if it is at the end of a source string, otherwise returns the source string. | | |
32. | Check if a String ends with a specified suffix. | | |
33. | Check if a String starts with a specified prefix. | | |
34. | Determine if a String is contained in a String Collection | | |
35. | Determine if a String is contained in a String Collection, ignoring case | | |
36. | Determine if a String is contained in a String [], ignoring case | | |
37. | Determine if a String is contained in a String [], ignoring case or not as specified | | |
38. | Determine if a String is contained in a String[] | | |
39. | Determines if the specified string contains only Unicode letters or digits as defined by Character#isLetterOrDigit(char) | | |
40. | Determining the validity of various XML names | | |
41. | Return the nth index of the given token occurring in the given string | | |
42. | Find the earliest index of any of a set of potential substrings. | | |
43. | Find the latest index of any of a set of potential substrings. | | |
44. | Fast String Search | | |
45. | Performs continuous matching of a pattern in a given string. | | |
46. | Count match | | |