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Question about the task

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package com.codegym.task.task10.task1015;

import java.util.ArrayList;

/*
Array of string lists

*/

public class Solution {
    public static void main(String[] args) {
        ArrayList<String>[] arrayOfStringList = createList();
        printList(arrayOfStringList);
    }

    public static ArrayList<String>[] createList() {
        //write your code here
         ArrayList<String> list1 = new ArrayList<String>();
         list1.add("String1");
         list1.add("String2");

         ArrayList<String> list2 = new ArrayList<String>();
         list1.add("String3");
         list1.add("String4");

        ArrayList<String>[] arrayOfStringList = new ArrayList[2];
        arrayOfStringList[0] = list1;
        arrayOfStringList[1] = list2;


        return arrayOfStringList;
    }

    public static void printList(ArrayList<String>[] arrayOfStringList) {
        for (ArrayList<String> list : arrayOfStringList) {
            for (String s : list) {
                System.out.println(s);
            }
        }
    }
}

Create an array whose elements are lists of strings.
Fill the array with any data and display it on the screen.

Requirements:

The createList method must declare and initialize an array with ArrayList<String> elements.
The createList method must return the created array.
The createList method must add elements (string lists) to the array. The lists must not be empty.
The program should display data on the screen.
The main method must call the createList method.
The main method must call the printList method.

package com.codegym.task.task10.task1015; import java.util.ArrayList; /* Array of string lists */ public class Solution { public static void main(String[] args) { ArrayList<String>[] arrayOfStringList = createList(); printList(arrayOfStringList); } public static ArrayList<String>[] createList() { //write your code here ArrayList<String> list1 = new ArrayList<String>(); list1.add("String1"); list1.add("String2"); ArrayList<String> list2 = new ArrayList<String>(); list1.add("String3"); list1.add("String4"); ArrayList<String>[] arrayOfStringList = new ArrayList[2]; arrayOfStringList[0] = list1; arrayOfStringList[1] = list2; return arrayOfStringList; } public static void printList(ArrayList<String>[] arrayOfStringList) { for (ArrayList<String> list : arrayOfStringList) { for (String s : list) { System.out.println(s); } } } }

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Alexander

Level 19 , Hamburg, Germany

22 April 2021, 16:19

useful

Nothing has been added to the list2. Тherefore the list2 is empty, add something in. Another possibility is to use list1 as constructor parameter: ArrayList<String> list2 = new ArrayList<String>(list1);