Remove Strings with same characters in a String Array

Tag: java,arrays,string

I'm facing a problem right now. In one of my program, I need to remove strings with same characters from an Array. For eg. suppose,

I have 3 Arrays like,

String[] name1 = {"amy", "jose", "jeremy", "alice", "patrick"};
String[] name2 = {"alan", "may", "jeremy", "helen", "alexi"};
String[] name3 = {"adel", "aron", "amy", "james", "yam"};

As you can see, there is a String amy in the name1 array. Also, I have strings like may, amy and yam in the next two arrays. What I need is that, I need a final array which does not contain these repeated Strings. I just need only one occurrence: I need to remove all permutations of a name in the final array. That is the final array should be:

String[] finalArray={"amy", "jose", "alice", "patrick","alan", "jeremy", "helen", "alexi","adel", "aron", "james"}

(The above array removed both yam, may, and only includes amy).

What i have tried so far, using HashSet, is as below

String[] name1 = {"Amy", "Jose", "Jeremy", "Alice", "Patrick"};
String[] name2 = {"Alan", "mAy", "Jeremy", "Helen", "Alexi"};
String[] name3 = {"Adel", "Aaron", "Amy", "James", "Alice"};
Set<String> letter = new HashSet<String>();
for (int i = 0; i < name1.length; i++) {
    letter.add(name1[i]);
}
for (int j = 0; j < name2.length; j++) {
    letter.add(name2[j]);
}
for (int k = 0; k < name3.length; k++) {
    letter.add(name3[k]);
}
System.out.println(letter.size() + " letters must be sent to: " + letter);

But, the problem with this code is that, it just removes multiple occurences of the same string. Is there any other alternative? Any help is very much appreciated.

Best How To :

TreeSet allows us to give a comparator. See whether this helps.

    package empty;

    import java.util.Arrays;
    import java.util.Comparator;
    import java.util.Set;
    import java.util.TreeSet;

    public class RemoveDuplicateStrings {

        public static void main(String[] args) {
            String[] name1 = {"amy", "jose", "jeremy", "alice", "patrick"};
            String[] name2 = {"alan", "may", "jeremy", "helen", "alexi"};
            String[] name3 = {"adel", "aron", "amy", "james", "yam"};

            Set<String> set = new TreeSet<String>(new Comparator<String>() {
                @Override public int compare(String o1, String o2) {
                    char[] a1 = o1.toCharArray();
                    Arrays.sort(a1);
                    char[] a2 = o2.toCharArray();
                    Arrays.sort(a2);
                    return new String(a1).compareTo(new String(a2));
                }
            });

            for (String name : name1) {
                set.add(name);
            }
            for (String name : name2) {
                set.add(name);
            }
            for (String name : name3) {
                set.add(name);
            }

            String[] result = set.toArray(new String[set.size()]);

            System.out.println(Arrays.asList(result));
        }
    }

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