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Java Program to Remove Duplicate Element in an array
Here is one way you can remove duplicates from an array in Java:
The program first creates an empty LinkedHashSet and then adds each element from the input array to the set. Because a set does not allow duplicate elements, any duplicates in the input array will be automatically removed when they are added to the set.
After that we create new array with size of LinkedHashSet and copy the set elements to new array then return it.
This example remove duplicates from integer array, you can use this logic with other type of array with necessary modification.
import java.util.Arrays;
import java.util.LinkedHashSet;
class RemoveDuplicates
{
public int[] removeDuplicates(int[] nums) {
// LinkedHashSet preserves the insertion order and removes duplicates
LinkedHashSet<Integer> set = new LinkedHashSet<>();
for (int i : nums) {
set.add(i);
}
int[] uniqueNums = new int[set.size()];
int i = 0;
for (int n : set) {
uniqueNums[i++] = n;
}
return uniqueNums;
}
}
public class Main {
public static void main(String[] args) {
RemoveDuplicates rm=new RemoveDuplicates();
int[] nums = {1, 2, 3, 4, 4, 5, 6, 7, 8, 8, 9};
int[] uniqueNums = rm.removeDuplicates(nums);
System.out.println("Original Array : " + Arrays.toString(nums));
System.out.println("Unique Array : " + Arrays.toString(uniqueNums));
}
}
This program uses a LinkedHashSet to remove duplicates from the input array. A LinkedHashSet is a special type of HashSet that preserves the insertion order of elements. This means that the order of elements in the input array is preserved in the output array.
The program first creates an empty LinkedHashSet and then adds each element from the input array to the set. Because a set does not allow duplicate elements, any duplicates in the input array will be automatically removed when they are added to the set.
After that we create new array with size of LinkedHashSet and copy the set elements to new array then return it.
This example remove duplicates from integer array, you can use this logic with other type of array with necessary modification.
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