The necessary steps include the following:

1. Insert the following import statements:

import java.util.ArrayList;
import java.util.List;
import com.aliasi.sentences.IndoEuropeanSentenceModel;
import com.aliasi.sentences.SentenceModel;
import com.aliasi.tokenizer.IndoEuropeanTokenizerFactory;
import com.aliasi.tokenizer.Tokenizer;
import com.aliasi.tokenizer.TokenizerFactory;

2. Next, add the following code segment to the main method, which creates a tokenizer and sentence model:

String text = 
    "We will start with a simple sentence. However, is it "
    + "possible for a sentence to end with a question "
    + "mark? Obviously that is possible! Another "
    + "complication is the use of a number such as 56.32 "
    + "or ellipses such as ... Ellipses may be found ... "
    + "with a sentence! Of course, we may also find the "
    + "use of abbreviations such as Mr. Smith or "
    + "Dr. Jones.";
TokenizerFactory tokenizerFactory = 
    IndoEuropeanTokenizerFactory.INSTANCE;
SentenceModel sentenceModel = new IndoEuropeanSentenceModel();

3. Add the following lists, which will hold the tokens and white space:

List<String> tokenList = new ArrayList<>();
List<String> whiteList = new ArrayList<>();

4. Insert the next code sequence to populate these lists and find the sentence boundaries:

Tokenizer tokenizer = tokenizerFactory.tokenizer(
    text.toCharArray(), 0, text.length());
tokenizer.tokenize(tokenList, whiteList);

int[] sentenceBoundaries = sentenceModel.boundaryIndices(
    tokenList.toArray(new String[tokenList.size()]),
    whiteList.toArray(new String[whiteList.size()]));

5.  Add the following code to display the sentences detected:

int start = 0;
for (int boundary : sentenceBoundaries) {
    System.out.print("[");
    while (start <= boundary) {
        System.out.print(tokenList.get(start) + 
            whiteList.get(start + 1));
        start++;
    }
    System.out.println("]");
}

6. Execute the program. You will see the following output displayed:

[We will start with a simple sentence. ]
[However, is it possible for a sentence to end with a question mark? ]
[Obviously that is possible!. ]
[Another complication is the use of a number such as 56.32 or ellipses such as ... Ellipses may be found ... with a sentence! ]
[Of course, we may also find the use of abbreviations such as Mr. Smith or Dr. Jones.]