Why the program doesn't work ? it passes when i use add() but not with set(). Throws array-out-of bounds exception. The list isn't getting initialized to capacity 5.

Question about the task

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package com.codegym.task.task07.task0707;

import java.util.*;

/*
What sort of list is that?

*/

public class Solution {
    public static void main(String[] args) throws Exception {
        //write your code here
        ArrayList<String> string = new ArrayList<String>(5);

        string.set(0,"r1");
        string.set(1,"r2");
        string.set(2,"r3");
        string.set(3,"r4");
        string.set(4,"r5");


        System.out.println(string.size());

        for (int i=0;i<string.size();i++){
            System.out.println(string.get(i));
        }
    }
}

Comments (6)

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Serg

Level 23 , Tyumen, Russian

23 May 2019, 10:07

What does the code mean in this term?

ArrayList<String> string = new ArrayList<String>(5);

What is it?

<String>

Janusz

Level 11 , Radomsko, Poland

7 December 2018, 12:35

It's the same with me. Thanks for the hint with add - it is good.

satya vath

Level 9 , Mumbai, India

21 November 2018, 13:27

// bro use this code
package com.codegym.task.task07.task0707;

import java.util.ArrayList;

/*
What sort of list is that?

*/

public class Solution {
    public static void main(String[] args) throws Exception {
        //write your code here
        ArrayList<String> list = new ArrayList<String>();
        String a = "fg",b = "f",c = "l",d = "e", e = "f";

        list.add(a);
        list.add(b);
        list.add(c);
        list.add(d);
        list.add(e);
        System.out.println(list.size());
        for (int i = 0; i < 5;i++){
            System.out.println(list.get(i));
        }

    }
}

Roman

Level 41

6 September 2018, 10:46

Try to run the code:

public static void main(String[] args) {
    ArrayList string = new ArrayList(5);
    System.out.println(string.size());
}

Ankush Rajput

Level 25 , Bhopal, India

6 September 2018, 11:04

tried that but it was showing zero.

Roman

Level 41

6 September 2018, 11:25

Yes, your list doesn't have elements. And you cannot use set method.