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Java Source | 2000-05-25 | 4.3 KB | 123 lines |
- //: AnalyzeSentence.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- // Look for particular sequences
- // within sentences.
- import java.util.*;
-
- 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");
- }
- static StringTokenizer st;
- static void analyze(String s) {
- prt("\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) prt("Sad detected");
- }
- static String next() {
- if(st.hasMoreTokens()) {
- String s = st.nextToken();
- prt(s);
- return s;
- }
- else
- return "";
- }
- static void prt(String s) {
- System.out.println(s);
- }
- } ///:~