The necessary steps include the following:

1. Add these import statements to your project:

import java.util.Arrays;
import java.util.List;
import edu.stanford.nlp.parser.lexparser.LexicalizedParser;
import edu.stanford.nlp.trees.Tree;
import edu.stanford.nlp.trees.TreePrint;

2. Add the following to the main method of your project to load a model and declare a sentence:

LexicalizedParser lexicalizedParser = 
    LexicalizedParser.loadModel("englishPCFG.ser.gz");
List<String> wordList = Arrays.asList("The", "old man", "sat", 
    "down", "beside", "the", "tree", ".");

3. Next, add the following to parse the sentence and display the results:

Tree tree = lexicalizedParser.parseStrings(wordList);
tree.pennPrint();

4. Execute the program. You will get the following output:

(ROOT
 (S
 (NP (DT The) (NN old man))
 (VP (VBD sat)
 (PRT (RP down))
 (PP (IN beside)
 (NP (DT the) (NN tree))))
 (. .)))