Student.java

public class Student {

    private String name;
    private String address;
    private int age;

    public Student(String name, int age, String address) {
        this.name = name;
        this.age = (age > 0) ? age : 18;
        this.address = address;
    }

    public Student() {
        this("Default Name", 18,"Default Address");
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Name: " + name + "\n" + "Age: " + age + "\n" + "Address: " + address;
    }
}