fails to compile

Question about the task

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Hi, can't find my error. on both IDE task won't compile. on Intelli J return statement on line 22 creates a green lines. can't find symbol list/List lines 24-29. Thanks

Create a list whose elements are arrays of numbers.
Add to the list five array objects whose lengths are 5, 2, 4, 7, and 0, respectively.
Fill the arrays with any data and display them on the screen.

Requirements:

The program must not read data from the keyboard.
The createList method must declare and initialize an ArrayList<int[]> variable.
The createList method must return the created list.
The createList method must add 5 elements to the list.
Each element in the list must be an array of numbers. The length of the first array must be 5; the second — 2; and the rest — 4, 7, and 0, respectively.
The program should display the elements of all the arrays in the list. Each element on a new line.

package com.codegym.task.task09.task0926; import java.util.ArrayList; /* List of number arrays */ public class Solution { public static void main(String[] args) { ArrayList<int[]> list = createList(); printList(list); } public static ArrayList<int[]> createList() { int[] five = {1, 2, 3, 4, 5}; int[] two = {6, 7}; int[] four = {8, 9, 10, 11}; int[] seven = {12, 13, 14, 15, 16, 17, 18}; int[] zero = {0}; return list.add(0, 5); list.add(1, 2); list.add(2, 4); list.add(3, 7); list.add(4, 0); return list; } public static void printList(ArrayList<int[]> list) { for (int[] array : list) { for (int x : array) { System.out.println(x); } } } }

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Mike McKenna

Level 25 , Wilmington, United States

3 January 2020, 16:54

read task requirements carefully . do not put any matching numbers in arrays . always check the math !! that was my problem did not check closely enough .

Anonymous #10410173 Full Stack Developer

3 January 2020, 06:57

you should modify your code like this ////

package com.codegym.task.task09.task0926;

import java.util.ArrayList;

/*
List of number arrays

*/

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

    public static ArrayList<int[]> createList() {
        ArrayList<int[]> list = new ArrayList<int[]>();
        int[] five = {1, 2, 3, 4, 5};
        int[] two = {6, 7};
        int[] four = {8, 9, 10, 11};
        int[] seven = {12, 13, 14, 15, 16, 17, 18};
        int[] zero = {};

        list.add(five);
        list.add(two);
        list.add(four);
        list.add(seven);
        list.add(zero);
        return list;

    }

    public static void printList(ArrayList<int[]> list) {
        for (int[] array : list) {
            for (int x : array) {
                System.out.println(x);
            }
        }
    }
}

Sarah Suß

Level 25 , Hamburg, Germany

13 December 2019, 17:57

In Line 21 you should initialize an Array of 0 ints, not one int with the value of zero.

Marina

Level 18 , Chisinau, Moldova, Republic of

12 December 2019, 06:50

Try to create an ArrayList<int[]> list ... in your createList() and add all your int[] to the list(ex: list.add(o, five)) and remove line 22. It should work now :)

Anthony Chalk

Level 30 , London, United Kingdom

11 December 2019, 22:46

In the createList() method you haven't actually created an ArrayList to populate. Also, you're adding ints to the list, as opposed to the int[]s that you created. 5=/=five. You might want to get rid of line 22 as well