Map to Charsequence[] but not in order

Question

I am having a Map and converting to charsequence[] by using the

final CharSequence[] treatmentNameList = treatmentListMap.keySet().toArray(new CharSequence[treatmentListMap.size()]);

but the value at position of charsequence[0] and map 0 is not is getting varied. how to get same values in both charsequence and map. i tried this also

final CharSequence[] treatmentNameList = treatmentListMap.keySet().toArray(new CharSequence[0]);

Can you please provide an example of the input you have and the expected output? — mariosangiorgio, Jul 30 '13 at 13:00
0-treatmentListMap 1-treatmentListMap.......in charsequence[0]=vitamins im expecting for Iron — Sivakumar Purushothaman, Jul 30 '13 at 13:02

score 1 · Accepted Answer · edited May 23 '17 at 12:20

1

You're getting a key Set. A set does not in general guarantee any order, hence the order being different for different calls. You may have more luck with a LinkedHashMap, if you are able to control the implementation of the map you're using. See the Javadocs for more information about them.

This post:

Does Java's LinkedHashMap maintain the order of keys?

has more information for you.

edited May 23 '17 at 12:20

Community

1
1

answered Jul 30 '13 at 13:10

user1111284

886
1
6
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score 1 · Answer 2 · answered Jul 30 '13 at 13:45

As suggested by user1111284, it perfectly works. Please look into the below code

public class MapToCharSequenceTest {

public static void main(String[] args){
    LinkedHashMap<String,String> contents = new LinkedHashMap<String,String>();

    contents.put("brass","rod");
    contents.put("Silver","spoon");
    contents.put("gold","ring");
    contents.put("iron","plate");
    Set<String> set = contents.keySet();
    final CharSequence[] charsequence  = set.toArray( new CharSequence[contents.size()]);
    for(CharSequence c : charsequence){
        System.out.println(c);
    }
}

}

junkiecoder · Answer 3 · 2013-08-10T06:06:04.150

0

Please read the javadoc for CharSequence. Have you seen http://docs.oracle.com/javase/6/docs/api/java/lang/CharSequence.html?

edited Aug 10 '13 at 06:06

answered Jul 30 '13 at 13:22

junkiecoder

91
5

Map to Charsequence[] but not in order

3 Answers3