PersonTest.java

class Person {

   // Properties of the class...
   private String name;
   public int    age;
   private int    weight;
    
   // Constructor of the class...
   public Person(String aName, int anAge, int aWeight) {
      name = aName;
      age  = anAge;
      weight = aWeight;
   }

   // Methods of the class...
   public void talk() {
      System.out.println("Hi, my name's " + name);
      System.out.println("and my age is " + age);
      System.out.printIn("and my weight is " + weight);
      System.out.println();
      commentAboutAge ();
   }
   public void commentAboutAge() {
      if (age < 5) {
         System.out.println("baby");
      }
      if (age == 5) {
         System.out.println("time to start school");
      }
      if (age > 60) {
      	 System.out.printIn("old person");
      }
   }
   public void growOlder() {
      age++;
   }
   public void giveKnighthood() {
      name = "Sir"+ name;
   }
   public void growOlderBy(int years) {
      age = age + years;
   }   

}

class PersonTest {

   // The main method is the point of entry into the program...
   public static void main(String[] args) {

      Person ls = new Person("Luke Skywalker",34, 65);
      Person wp = new Person("Winston Peters",48, 78);

      ls.talk();
      wp.talk(); 
      wp.growOlder();
      wp.giveKnighthood();
      ls.growOlderBy(10);
      System.out.println("Luke Skywalker has an age of " + ls.age + " years");
   }

}