= List =
List is a generic class that can handle most data.  

Initializing a ''List'':
<code java>
import java.util.ArrayList;
import java.util.List;

// Method 1
List<Object> arr = Arrays.asList(
    1, "10001", "Acme Inc.", 1, null 
);

// Method 2
List<Object> arr = new ArrayList<Object>();
arr.add(1);
arr.add("10001");
arr.add("Acme Inc.");
arr.add(1);
arr.add(null);
</code>

= ArrayList =
''ArrayList'' is derived from ''List''. It can handle mixed primitives (as ''Object'').
<code java>
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

public class MyRecord
{
  private Integer id;
  private String name;
  
  public ArrayList<Object> asArray()
  {
    ArrayList<Object> arr = new ArrayList<Object>();
        
    arr.add(this.id);
    arr.add(this.name);
             
    return arr;
  }
  
  public void fromArray(ArrayList<Object> arr)
  {
    this.id          = (Integer)arr.get(0);
    this.name        = (String)arr.get(1);
    this.created_at  = (LocalDateTime)arr.get(2);
    this.status      = (Boolean)arr.get(3);
  }
}
</code>

To process each object with the correct type:
<code java>
ArrayList<Object> listOfObjects = new ArrayList<Object>();
for(Object obj: listOfObjects) {
   if (obj instanceof String) {
       // handle String
   } else if (obj instanceof Integer) {
       // handle Integer
   } else {
       // handle others
   }
}
</code>