Initial data commit

Task/Remove-duplicate-elements/Java/remove-duplicate-elements-1.java

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+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;

Task/Remove-duplicate-elements/Java/remove-duplicate-elements-2.java

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+int[] removeDuplicates(int[] values) {
+    /* use a LinkedHashSet to preserve order */
+    Set<Integer> set = new LinkedHashSet<>();
+    for (int value : values)
+        set.add(value);
+    values = new int[set.size()];
+    Iterator<Integer> iterator = set.iterator();
+    int index = 0;
+    while (iterator.hasNext())
+        values[index++] = iterator.next();
+    return values;
+}

Task/Remove-duplicate-elements/Java/remove-duplicate-elements-3.java

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+int[] removeDuplicates(int[] values) {
+    List<Integer> list = new ArrayList<>();
+    for (int value : values)
+        if (!list.contains(value)) list.add(value);
+    values = new int[list.size()];
+    int index = 0;
+    for (int value : list)
+        values[index++] = value;
+    return values;
+}

Task/Remove-duplicate-elements/Java/remove-duplicate-elements-4.java

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+import java.util.*;
+
+class Test {
+
+    public static void main(String[] args) {
+
+        Object[] data = {1, 1, 2, 2, 3, 3, 3, "a", "a", "b", "b", "c", "d"};
+        Set<Object> uniqueSet = new HashSet<Object>(Arrays.asList(data));
+        for (Object o : uniqueSet)
+            System.out.printf("%s ", o);
+    }
+}

Task/Remove-duplicate-elements/Java/remove-duplicate-elements-5.java

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+import java.util.*;
+
+class Test {
+
+    public static void main(String[] args) {
+
+        Object[] data = {1, 1, 2, 2, 3, 3, 3, "a", "a", "b", "b", "c", "d"};
+        Arrays.stream(data).distinct().forEach((o) -> System.out.printf("%s ", o));
+    }
+}