ex4-2.java

public class Person {
    // private instance variables
    private String name, address;

    //Constructs a Person instance with the given name and address
    public Person(String name, String address) {
        this.name = name;
        this.address = address;
    }

    // Getters and Setters
    public String getName() {
        return name;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return name + " ( " + address + " ) ";
    }
}

//next class

public class Student extends Person {

    //private instance variables
    private String program;
    private int year;
    private double fee;

    //constructor
    public Student(String name, String address) {
        super(name, address);
        program = "";
        year = 0;
        fee = 0.00;
    }

    @Override
    public String toString() {
        return "Student: " + super.toString() + ", Program: " + getProgram() + ", Year: " + getYear() + ", Fee: " + getFee();
    }

    //getters and setters
    public String getProgram() {
        return program;
    }

    public void setProgram(String program) {
        this.program = program;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public double getFee() {
        return fee;
    }

    public void setFee(double fee) {
        this.fee = fee;
    }
}

//next class

public class Staff extends Person {

    //private instance variables
    private String school;
    private double pay;

    //constructor
    public Staff(String name, String address) {
        super(name, address);

        school = "";
        pay = 0.00;
    }


    @Override
    public String toString() {
        return "Staff: " + super.toString() + ", School: " + getSchool() + ", Pay: " + getPay();
    }

    //getters and setters
    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    public double getPay() {
        return pay;
    }

    public void setPay(double pay) {
        this.pay = pay;
    }
}

//test class

public class testStudentStaff {
    public static void main(String[] args) {

        //to test the student class
        Student s1 = new Student("Jiang Cheng", "05 Yunmeng Rd.");
        s1.setProgram("Information Technology");
        s1.setYear(2023);
        s1.setFee(19000.00);

        System.out.println(s1);

        System.out.println(); //blank print statement to make the output look neater

        Student s2 = new Student("Wei Wuxian", "45 Yiling Ave.");
        s2.setProgram("Theoretical Physics");
        s2.setYear(2022);
        s2.setFee(21000.00);

        System.out.println(s2);

        System.out.println(); //blank print statement to make the output look neater

        //to test the staff class
        Staff st1 = new Staff("Lan Xichen", "111 Gusu Dr.");
        st1.setSchool("Cloud Recesses University");
        st1.setPay(9000.00);

        System.out.println(st1);

        System.out.println(); //blank print statement to make the output look neater

        Staff st2 = new Staff("Lan Qiren", "22 Gusu Dr.");
        st2.setSchool("Cloud Recesses University");
        st2.setPay(12000.00);

        System.out.println(st2);
    }
}