Type mismatch: convert from String to List<String>

Question

I have in mind the algorithm of my school-class program, but also difficulty in some basics I guess...

here is my code with the problem:

import java.io.*;
import java.util.*;

public class Main {
  public static void main(String[] args) throws FileNotFoundException {
    String allWords = System.getProperty("user.home") + "/allwords.txt";
    Anagrams an = new Anagrams(allWords);
    for(List<String> wlist : an.getSortedByAnQty()) {
      //[..............];
    }
    }
}

public class Anagrams {

    List<String> myList = new ArrayList<String>();

    public List<String> getSortedByAnQty() {
        myList.add("aaa");
        return myList;
    }
}

I get "Type mismatch: cannot convert from element type String to List" How should initialise getSortedByAnQty() right?

Eran · Accepted Answer · 2015-11-03 11:12:17Z

9

an.getSortedByAnQty() returns a List<String>. When you iterate over that List, you get the individual Strings, so the enhanced for loop should have a String variable :

for(String str : an.getSortedByAnQty()) {
  //[..............];
}

If the main method should remain as is, you should change getSortedByAnQty to return a List<List<String>>.

edited Nov 3, 2015 at 11:12

answered Nov 3, 2015 at 11:08

Eran

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2 Comments

mallorn Over a year ago

unfortunately I can not change the Main{} ;)

Eran Over a year ago

@mallorn In that case, change getSortedByAnQty to return a List<List<String>> (i.e. a list of lists).

arjun99 · Accepted Answer · 2015-11-03 11:24:30Z

0

char[] cArray = "MYString".toCharArray();
convert the string to an array as above and then iterate over the character array to form a list of String as below

List<String> list = new ArrayList<String>(cArray.length);

for(char c : cArray){
    list.add(String.valueOf(c));
}

answered Nov 3, 2015 at 11:24

arjun99

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