how to loop through arraylist of objects in java

To loop through the elements of an ArrayList of objects in Java, you can use a for loop or the for-each loop.

Here is an example of how you can use a for loop to iterate through the elements of an ArrayList and print their values:

List<Person> people = new ArrayList<>();
people.add(new Person("John", "Doe"));
people.add(new Person("Jane", "Doe"));
people.add(new Person("Bob", "Smith"));

for (int i = 0; i < people.size(); i++) {
    Person person = people.get(i);
    System.out.println(person.getFirstName() + " " + person.getLastName());
}

This will print the first and last names of the Person objects in the ArrayList.

Here is an example of how you can use a for-each loop to achieve the same result:

List<Person> people = new ArrayList<>();
people.add(new Person("John", "Doe"));
people.add(new Person("Jane", "Doe"));
people.add(new Person("Bob", "Smith"));

for (Person person : people) {
    System.out.println(person.getFirstName() + " " + person.getLastName());
}

You can also use the Iterator class to iterate through the elements of an ArrayList, like this:

List<Person> people = new ArrayList<>();
people.add(new Person("John", "Doe"));
people.add(new Person("Jane", "Doe"));
people.add(new Person("Bob", "Smith"));

ListIterator<Person> iter = people.listIterator();

while(iter.hasNext()){
    Person person = iter.next();
    System.out.println(person.getFirstName() + " " + person.getLastName());
}