Aggregate class - Tutorial

public class SentenceDemo{

   public static void main(String[] args){

      

       Sentence s1=new Sentence();

       System.out.println(s1.getMessage());

       System.out.println(s1.getMessage());

       System.out.println(s1.getMessage());

       System.out.println(s1.getMessage());

       System.out.println(s1.getMessage());

       System.out.println(s1.getMessage());

       System.out.println(s1.getCounter());

    }

}

public class Sentence{

  private String message;

  public static final int SIZE=5;

  private static int counter;

  private String messages[]={

      new Pronoun().getWord()+new Verb().getWord()+new Adjective().getWord()+new Adverb().getWord(),

      new Pronoun().getWord()+new Verb().getWord()+new Adjective().getWord()+new Adverb().getWord(),

      new Pronoun().getWord()+new Verb().getWord()+new Adjective().getWord()+new Adverb().getWord(),

      new Pronoun().getWord()+new Verb().getWord()+new Adjective().getWord()+new Adverb().getWord(),

      new Pronoun().getWord()+new Verb().getWord()+new Adjective().getWord()+new Adverb().getWord(),

    };

  public Sentence(){

      java.util.Random ran=new java.util.Random();

      message=messages[ran.nextInt(SIZE)]+".";

     counter++;

    }

  private Sentence(String message){

      super();

      this.message=message;

      counter++;

    }

  public String getMessage(){

      java.util.Random ran=new java.util.Random();

      message=messages[ran.nextInt(SIZE)]+".";

      message=message.replaceFirst("[a-zA-Z]", ""+Character.toUpperCase(message.charAt(0)));

      return message;

    }

    public Sentence deepCopy(Sentence s){

        return new Sentence(s.message);

    }

    public boolean equals(Sentence s){

        return (message.equals(s.message))?true:false;

    }

    public int getCounter(){

        return counter;

    }

}

public class Verb{

  private String word;

  private String words[]={" write "," run "," drive "," walk ","crawl"};

  public Verb(){

      java.util.Random ran=new java.util.Random();

      word=words[ran.nextInt(Sentence.SIZE)];

    }

  public String getWord(){

      return word;

    }

}

public class Pronoun{

  private String word;

  private String words[]={"I ","you ","me ","we ","us "};

  public Pronoun(){

      java.util.Random ran=new java.util.Random();

      word=words[ran.nextInt(Sentence.SIZE)];

    }

  public String getWord(){

      return word;

    }

}

public class Adjective{

  private String word;

  private String words[]={" very "," quiet ","  "," short "," creepy "};

  public Adjective(){

      java.util.Random ran=new java.util.Random();

      word=words[ran.nextInt(Sentence.SIZE)];

    }

  public String getWord(){

      return word;

    }

}

public class Adverb{

  private String word;

  private String words[]={" quickly "," very "," slowly "," beautifully "," happily "};

  public Adverb(){

      java.util.Random ran=new java.util.Random();

      word=words[ran.nextInt(Sentence.SIZE)];

    }

  public String getWord(){

      return word;

    }

}