comparing and adding array element

Question

i am trying to remove duplicate values from my array present i my android project my array is,

String [] standard = {"7", "7", "8", "7", "8", "7", "6"};

i want only unique values that will be stored in an array.like {7, 8, 6}. i am trying to solev this with comparing each element of array with itself and then add it into array. i have tried googling to solve this but i am failed to solve this. means offcourse i am mistaking at somewhere.

how to solve this using the same way that i am trying to solve.

please google and try to find answers on stack overflow first, before posting a duplicate question. — VijayD
– VijayD, Commented Feb 21, 2017 at 10:57
Possible duplicate of How do I remove repeated elements from ArrayList? Note : Passing from the Array to an ArrayList is easy — AxelH
– AxelH, Commented Feb 21, 2017 at 11:11

v4_adi · Accepted Answer · 2017-02-21 11:31:57Z

4

You haven't posted why you are using the array but one solution of the problem is to use set data structure. As follows. Set doesn't allow inserting duplicate values.

 Set<String> setExam = new HashSet<>();

  setExam.add("1");
  setExam.add("2");
  setExam.add("1");

you can also convert array to set as follows

Set<T> mySet = new HashSet<T>(Arrays.asList(someArray));

Set will contain only values 1 and 2. It will NOT contain duplicate values.

edited Feb 21, 2017 at 11:31

answered Feb 21, 2017 at 10:51

v4_adi

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1 Comment

v4_adi Over a year ago

@statosdotcom Glad I could help.

Community · Accepted Answer · 2017-05-23 12:02:02Z

0

according to this link link

You can do it in one line in java 7:

String[] unique = new HashSet<String>(Arrays.asList(array)).toArray(new String[0]);

and shorter and simpler in java 8:

String[] unique = Arrays.stream(array).distinct().toArray(new String[0]);

edited May 23, 2017 at 12:02

CommunityBot

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answered Feb 21, 2017 at 10:49

Hamid Reza

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1 Comment

AxelH Over a year ago

What are you adding to Bohemian's answer ? You can flag for duplicate if you want (I think you have enough reputation) or comment with this answer link.

Naman Arora · Accepted Answer · 2017-02-21 13:44:32Z

0

HashSet set=new HashSet();   
String [] standard = {"7", "7", "8", "7", "8", "7", "6"};
for(int i=0;i<standard.length;i++){
    set.add(standard[i]);
}
Iterator iter = set.iterator();
while(iter.hasNext()) {
    System.out.println(iter.next());
}

answered Feb 21, 2017 at 13:44

Naman Arora

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Comments

Sanjay Chandlekar · Accepted Answer · 2017-02-24 05:35:25Z

If you want to do this with the help of array only, you can use this.

1) Sort the string array.
2) Use another array to store ans.
3) Store first element of your standard array to new array.
4) Compare from second element of the array, and if two elements are different add that element to ans array.

See the code.

public static void main(String args[]) throws Exception
{       
    String [] standard = {"7", "7", "8", "7", "8", "7", "6"};

    System.out.println();

    Arrays.sort(standard);

    String Ans[] = new String[100];

    int k = 0;

    Ans[k++] = standard[0];

    for(int i = 1 ; i < standard.length ; i++)
    {
        if(!standard[i-1].equals(standard[i]))
            Ans[k++] = standard[i];
    }

    for(int i = 0 ; i < 100 && Ans[i] != null; i++)
        System.out.print(Ans[i] + " ");
}

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