How to add new object ArrayList of Array to inside another ArrayList?

Question

So, I have this code , where basically I want to put a String Array to inside of an ListArray, then put that ListArray to inside of another ListArray. While I know how to put a new object of Array , I can't seem to find a way to put a new ListArray object to another ListArray

import java.util.ArrayList;
import java.util.List;
public class HelloWorld
{
 public static void main(String[] args)
 {
 ArrayList<List<String[]>> menues = new ArrayList<>();
 ArrayList<String[]> items = new ArrayList<String[]>();
 String price = "12ドル";
 for (int i = 0; i < 3; i++) {
 for (int j = 0; j < 5; j++) {
 String name = "Item Code-" + String.valueOf(i) + String.valueOf(j);
 items.add( new String[]{name, price} );
 }
 menues.add(items); // This line is the cause
 }
 for (int i = 0; i < 3; i++) {
 for (int j = 0; j < 5; j++) {
 System.out.println(menues.get(i).get(j)[0]);
 }
 }
 }
}

There Result I expect is

Item Code-00
Item Code-01
Item Code-02
Item Code-03
Item Code-04
Item Code-10
Item Code-11
Item Code-12
Item Code-13
Item Code-14
Item Code-20
Item Code-21
Item Code-22
Item Code-23
Item Code-24

The Result THAT I GOT (basically just repeating the same thing)

Item Code-00
Item Code-01
Item Code-02
Item Code-03
Item Code-04
Item Code-00
Item Code-01
Item Code-02
Item Code-03
Item Code-04
Item Code-00
Item Code-01
Item Code-02
Item Code-03
Item Code-04

Answer 1

You need to move the creation of items inside the loop:

for (int i = 0; i < 3; i++) {
 ArrayList<String[]> items = new ArrayList<String[]>();
 for (int j = 0; j < 5; j++) {
 String name = "Item Code-" + String.valueOf(i) + String.valueOf(j);
 items.add( new String[]{name, price} );
 }
 menues.add(items); // This line is the cause
}

Otherwise you add the same items all over again which results in the outer list containing the same list 3 times.