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// : 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 "";
}
} ///:~
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