how can we use java array with generics

GenericArray.java

import java.util.ArrayList;

public class GenericArray <T>{
    
  private ArrayList<T> arrayList;
  private Object[] array;
    
  // constructor with parameter ArrayList
  public GenericArray(ArrayList<T> list){
    arrayList = list;
     array = null;
  }
    
  // constructor with parameter array
  public GenericArray(Object[] array){
    arrayList = null;
    this.array = array;
  }
    
  // method to print all items inside ArrayList
  public void printArrayList(){
    for(T item : arrayList){
      System.out.println(item.toString());
    }
  }
    
  // method to print all items inside array
  public void printArray(){
    for(Object obj : array){
      // we need this ugly casting here and all done
      T item = (T) obj;
      System.out.println(item.toString());
    }
  }

  // let's make all this stuff running
  public static void main(String[] args){
       
        // first ArrayList
        ArrayList<String> list = new ArrayList<>();
        list.add("Hello");
        list.add("world");
        list.add("from");
        list.add("ArrayList");
        GenericArray<String> arrayList = new GenericArray<>(list);
        arrayList.printArrayList();
        
        System.out.println();
        
        // now array
        String[] arr = {"Hello", "world", "from", "array"};
        GenericArray<String> array = new GenericArray<>(arr);
        array.printArray();
    }
}