How to create an ArrayList of arrays of Objects in Java?

You create an ArrayList of arrays this way :

ArrayList<Object[]> action = new ArrayList<Object[]>();

Each time you add an Object[] to that list, it must have a fixed length. If you want variable length arrays inside the ArrayList, I suggest you use ArrayList<ArrayList<Object>>.

Your syntax with objectArray is simply not valid Java syntax.

The type parameter in the generic List class should be the class name and not the name of the variable that references the array:

ArrayList<Object[]> action = new ArrayList<Object[]>();

Two notes:

1. Try to avoid declaring types to the implementations. Declare action as a List (the interface):

   List<Object[]> action = new ArrayList<Object[]>();

2. It would make life a bit easier if you make the parameter another List instead of an array of Objects:

   List<List<?>> action = new ArrayList<List<?>>();

ArrayList<LoadClass[]> sd = new ArrayList<LoadClass[]>();

This works :)

So, you have two questions:

Object[] objectArray = new Object() 
ArrayList<objectArray[]> action = new ArrayList<objectArray[]>();

Change it to:

int MAX_ARRAY = 3;
Object[] objectArray = new Object[MAX_ARRAY];

ArrayList<Object[]> action = new ArrayList<Object[]>();

Now you can add your objectArray to "action":

action.add(objectArray);

It's a easy stuff.

// Class Student with a attribute name
public class Student{
    String name;
    public Student(String name){
        this.name = name;
    }

    public String getName(){
        return this.name;
    }


public static void main(String[] args) {
    // Creating an ArrayList for Students
    ArrayList<Student> students = new ArrayList<Student>();

    // Creating an Students Objects
    Student a1 = new Student("Name1");
    Student a2 = new Student("Name2");
    Student a3 = new Student("Name3");

    // Populating ArrayList<Student>
    students.add(a1);
    students.add(a2);
    students.add(a3);

    // For Each to sweeping all objects inside of this ArrayList
    for(Student student : students){
        System.out.println(student.getName());
    }
}

Enjoy!