Create a Java program based on what you have learned so far. Your output MUST HAVE at least two (2) of the following concepts:Objects, Classes, MethodsInheritanceException HandlingJava File Input/Output

Sure, here is a simple Java program that uses Classes, Methods, Inheritance, Exception Handling and Java File Input/Output:

import java.io.*;

class Person {
    String name;
    int age;

    Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    void display() {
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
    }
}

class Employee extends Person {
    int salary;

    Employee(String name, int age, int salary) {
        super(name, age);
        this.salary = salary;
    }

    @Override
    void display() {
        super.display();
        System.out.println("Salary: " + salary);
    }
}

public class Main {
    public static void main(String[] args) {
        Employee emp = new Employee("John", 30, 5000);
        emp.display();

        try {
            FileWriter writer = new FileWriter("employee.txt");
            writer.write("Name: " + emp.name + "\n");
            writer.write("Age: " + emp.age + "\n");
            writer.write("Salary: " + emp.salary + "\n");
            writer.close();
            System.out.println("Successfully wrote to the file.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }
}

This program creates a Person class with name and age as attributes and a display method to print these attributes. It also creates an Employee class that extends Person and adds a salary attribute. The Employee class also overrides the display method to include the salary.

In the main method, an Employee object is created and its details are displayed using the display method. Then, a FileWriter is used to write the employee's details to a file named employee.txt. Exception handling is used to catch and handle any IOException that might occur during file operations.