Exercise 5 – Overloaded constructors, composition, StringBuilder solution


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Steps: • In this lab exercise you will practice using overloaded constructors, composition, and StringBuilder • Create a class Name that has three String fields: first middle last • Put in overloaded constructors that chain calls to the one accepting three String references o Name(String, String, String) // first, middle, last o Name(String, String) // first, last (set middle to “unknown”) o Name(String) // first (set middle and last to “unknown”) o Name() // set all three fields to “unknown” • Add getter methods for each of the fields (i.e. create Read-Only Properties) (no setters) • Add a method getFullName() o Use a StringBuilder to append the three parts of the name together, separated by spaces o Return a reference to a String generated from the StringBuilder • Add a class person with a field of type Name “A person has-a name” • There should only be two fields in class Person, one of type Name, another for age of type int • Put overloaded constructors into class Person o One that allows first, middle, and last names to be passed as Strings o One that accepts a Name object reference, and an age as an int  Make a new Name inside Person, copying the references for the parts of the name. • Add one method named details() to return a String consisting of the persons full name and age also using a StringBuilder • Test your classes Person and Name using the following class: public class PersonTester { public static void main(String[] args) { Person person1 = new Person(“a1”, “b1”, “c1”, 11); Person person2 = new Person(new Name(“a2”, “b2”, “c2”), 22); Person person3 = new Person(new Name(“a3”, “c3”), 33); Person person4 = new Person(new Name(“a4”), 44); Person person5 = new Person(new Name(), 55); System.out.println(person1.details()); System.out.println(person2.details()); System.out.println(person3.details()); System.out.println(person4.details()); System.out.println(person5.details()); } } Grading Guide (Total Score 10): Name class correct 4 Person class correct 4 Program produces correct output 2 Sample Program Output a1 b1 c1 age: 11 a2 b2 c2 age: 22 a3 unknown c3 age: 33 a4 unknown unknown age: 44 unknown unknown unknown age: 55