LAB #5: INHERITANCE

---

1. Write the missing code in the following class definitions. Write a simple client for testing.

//Inheritance: Exercise #1 Class_1
public class Class_1 {
private int x;
private int y;

public Class_1() {
x = 0;
y = 0;
}

public Class_1(int x1, int y1) {
x = x1;
y = y1;
}

public void print() {
System.out.print(x + " " + y + " ");
}

public String toString() {
return x + " " + y + " ";
}

public void set(int x1, int y1) {
x = x1;
y = y1;
}
}

//Inheritance: Exercise #1 Class_2
public class Class_2 extends Class_1 {
private int z;

//x = 0, y = 0, z = 0
public Class_2() {
...
}

//x = x1, y = y1, z = z1
public Class_2(int x1, int y1, int z1) {
...
}

//output x, y, z
public void print() {
...
}

public String toString() {
...
}

//x = x1, y = y1, z = z1
public void set(int x1, int y1, int z1) {
...
}
}

---

2. Create a Person class. The class should contain 2 fields (both Strings called firstName and lastName) and the following methods:

• Default and alternate constructors.
• Two getters (accessors) to return the first and the last name
• A method named setName to set the fields to the parameters passed
• 2 methods to print:
1. A method named printLastFirst (in this order, use “,” as a separator)
2. A method called print (should print in order first name and last name)
• A method named toString()
• A method named equals (pass an object of the Object class)
• 2 methods named copy and getCopy to make a copy of a Person object into another Person object

The class Person should serve as the superclass (base class) for a class called Employee. This subclass (derived class) should contain 3 fields (payRate, hoursWorked,and department).

Continue the implementation for class Employee from here and complete the missing code:

//Class Employee: subclass of Person

public class Employee extends Person {

private double payRate;

private double hoursWorked;

private String department;

public final int HOURS = 40;

public final double OVERTIME = 1.5;

//default constructor

public Employee() {

...

}

//add an alternate constructor with parameters

public String toString() {

//should return a String like this:

//The wages for xxxx from the xxxx department are: $xxxxx.xx"

...

}

public void print() {

//Should print output like this (same line):

//The employee xxxx from the xxxx department worked xx hours

//with a pay rate of $xxx.xx. The wages for this employee are $xxxxx.xx

...

}

public double calculatePay() {

//Method to calculate and return the wages

//handle both regular and overtime pay

...

}

public void setAll(String first, String last, double rate, double hours, String dep){

...

}

public double getPayRate() {

...

}

public double getHoursWorked() {

...

}

public String getDepartment() {

...

}

public boolean equals(Object o) {

...

}

public Employee getCopy() {

...

}

public void copy(Employee e) {

...

}

}

Write a simple client for testing. Continue the implementation for class ClientEmployee from here:

//Client program for Person/Employee

import java.util.Scanner;

public class ClientEmployee {

public static void main(String[] arg) {

Scanner input = new Scanner(System.in);

String last, first, dept;

double pay_rate;

int hours;

Employee prof = new Employee("John", "Doe", 25.50, 50, "COSC"); //subclass alternate constructor invoked

Employee newEmp = new Employee(); //subclass default constructor invoked

...

...

}

}

SAMPLE OUTPUT:

Enter employee last name: Bond

Enter employee first name: James

Enter department: THEATRE

Enter employee pay rate: 35

Enter employee hours worked: 47

--- Record for both employees with overridden .toString from subclass ---

The wages for Doe, John from the COSC department are: $1402.50

The wages for Bond, James from the THEATRE department are: $1767.50

--- Output with calls to overridden method print from subclass ---

The employee John Doe from the COSC department worked 50.0 hours with a pay rate of $25.50. The wages for John Doe are $1402.50

The employee James Bond from the THEATRE department worked 47.0 hours with a pay rate of $35.00. The wages for James Bond are $1767.50

--- Output with calls to getters from the superclass ---

The wages for James Bond from the THEATRE department are $1767.50

--- Call to overridden equals/subclass for 2 Employee objects---

Couldn't find an employee with same record.

---

Notes:
A. The lab will NOT be graded, do NOT hand anything in to the instructor.
B. The lab should be completed by the start of the next scheduled lab class. Save the .java files on your disk and e-mail them (attachments) to Vishal Patel at vpatel12@students.towson.edu
Very important: Make sure that you have COSC 237.section, your name, and Lab#5 in the Subject box of your e-mail.
C. In case you have any problems, contact the instructor or the TA for assistance.