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up vote 1 down vote favorite

i'm having 2 string array,

  str1[] = {"a","b","aa","c"}

and

  str2[] = {"aa","a","b","c","d"}

how can i compare and remove value if exist in both string[], expected result, str3[]= {"d"}

thanks in advance

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hi expert, finally i found result for my question, which is List str3= ListUtils.subtract(Arrays.asList(str1), Arrays.asList(str2)); –  Apache Nov 28 '10 at 7:23
    
Didn't know you are using Apache Commons Library ( ref: ListUtils). –  crnlx Nov 28 '10 at 7:41

2 Answers 2

up vote 2 down vote accepted

ts1 will have "d" inside it after these operations.

String str1[] = {"a","b","aa","c"};
String str2[] = {"aa","a","b","c","d"};
TreeSet ts1 = new TreeSet(Arrays.asList(str2));
ts1.removeAll(Arrays.asList(str1));

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up vote 0 down vote

Convert the arrays to a list and add them to a set which will automatically remove duplicates. Use the toArray() method of Set interface to get the elements as an Array.

    String[] str1 = {"a","b","aa","c"};
    String[] str2 = {"aa","a","b","c","d"};

    Set set = new HashSet();
    set.addAll(Arrays.asList(str1));//add first array to set, removes duplicates
    set.addAll(Arrays.asList(str2));//add second array to set, removes duplicates
    String[] str3 = (String[])set.toArray(new String[set.size()]);//convert back to array
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