Java: Create and print Person objects

Java OOP: Exercise-1 with Solution

Write a Java program to create a class called "Person" with a name and age attribute. Create two instances of the "Person" class, set their attributes using the constructor, and print their name and age.

Sample Solution:

Java Code:

 // Define the Person class
public class Person {
    // Declare a private variable to store the name of the person
    private String name;
    // Declare a private variable to store the age of the person
    private int age;

    // Constructor for the Person class that initializes the name and age variables
    public Person(String name, int age) {
        // Set the name variable to the provided name parameter
        this.name = name;
        // Set the age variable to the provided age parameter
        this.age = age;
    }

    // Method to retrieve the name of the person
    public String getName() {
        // Return the value of the name variable
        return name;
    }

    // Method to retrieve the age of the person
    public int getAge() {
        // Return the value of the age variable
        return age;
    }

    // Method to set the name of the person
    public void setName(String name) {
        // Set the name variable to the provided name parameter
        this.name = name;
    }

    // Method to set the age of the person
    public void setAge(int age) {
        // Set the age variable to the provided age parameter
        this.age = age;
    }
}

The above class has two private attributes: name and age, and a constructor that initializes these attributes with the values passed as arguments. It also has a getter method to access the attributes.

// Define the Main class
public class Main {
    // Define the main method which is the entry point of the program
    public static void main(String[] args) {
        // Create an instance of the Person class with the name "Ean Craig" and age 11
        Person person1 = new Person("Ean Craig", 11);
        // Create another instance of the Person class with the name "Evan Ross" and age 12
        Person person2 = new Person("Evan Ross", 12);

        // Print the name and age of person1 to the console
        System.out.println(person1.getName() + " is " + person1.getAge() + " years old.");
        // Print the name and age of person2 to the console
        System.out.println(person2.getName() + " is " + person2.getAge() + " years old.\n");

        // Modify the age of person1 using the setter methods
        person1.setAge(14);
        // Modify the name and age of person2 using the setter methods
        person2.setName("Lewis Jordan");
        person2.setAge(12);
        System.out.println("Set new age and name:");
        // Print the updated name and age of person1 to the console
        System.out.println(person1.getName() + " is now " + person1.getAge() + " years old.");
        // Print the updated name and age of person2 to the console
        System.out.println(person2.getName() + " is now " + person2.getAge() + " years old.");
    }
} 

In the above example, we create two instances of the "Person" class, set their attributes with the constructor, and print their name and age using the getter methods. We also modify the attributes using the setter methods and print the updated values.

Sample Output:

Ean Craig is 11 years old.
Evan Ross is 12 years old.

Set new age and name:
Ean Craig is now 14 years old.
Lewis Jordan is now 12 years old.

Flowchart:

Java Code Editor:

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