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Java Program To Find Out Duplicate Element From An Array

 Java Program To Find Out Duplicate Element From An Array

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1) Find Out Duplicate Integer From An Array.
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public class DuplicateElementArray {

    public static void main(String[] args) {

        // Program To Find Out Duplicate Element Of An Array
        int arr[] = { 10, 20, 20, 30, 40, 50 };
        boolean flag = false;

        for (int i = 0; i < arr.length; i++) {
            for (int j = i + 1; j < arr.length; j++) {
                if (arr[i] == arr[j]) {
                    System.out.println("Duplicate Element Found:" + arr[i]);
                    flag = true;
                }
            }
        }

        if (flag = false) {
            System.out.println("Duplicate Element Not Found");
        }

    }

}

2) Find Out Duplicate String Of An Array
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public class DuplicateElementArray2 {

    public static void main(String[] args) {
       
        String arr[] = {"C","C++","C++","Python","Java"};
        boolean flag = false;
        for(int i=0; i< arr.length; i++)
        {
            for(int j = i +1; j < arr.length ; j++)
            {
                if(arr[i] == arr[j])
                {
                    System.out.println("Duplicate Element Found:" + arr[i]);
                    flag = true;
                }
            }
        }
        if(flag == false)
        {
            System.out.println("Duplicate Element Not Found In Array.");
        }

    }

}

3) Find Out Duplicate String From An Array Using HashSet
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import java.util.HashSet;

public class DuplicateEleUsingHashSet {

    public static void main(String[] args) {

        String arr[] = { "Java", "C", "C++", "Python", "Java" };

        HashSet<String> langs = new HashSet<String>();

        boolean flag = false;

        for (String str : arr) {

            if (langs.add(str) == false) {
                System.out.println("Found Duplicate Element:" + str);
                flag = true;
            }

        }
        if (flag == false) {
            System.out.println("Not Found Duplicate Elements");
        }

    }
}





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