Write a Java program to remove the duplicate elements of a given array and return the new length of the array.
Question
Write a Java program to remove the duplicate elements of a given array and return the new length of the array.
Solution
Here is a simple Java program that removes duplicate elements from an array and returns the new length of the array. This program uses a HashSet, which does not allow duplicate elements.
import java.util.HashSet;
public class Main {
public static void main(String[] args) {
int[] array = {1, 2, 2, 3, 4, 4, 5, 6, 6, 7};
int newLength = removeDuplicates(array);
System.out.println("The new length of the array is: " + newLength);
}
public static int removeDuplicates(int[] array) {
HashSet<Integer> set = new HashSet<>();
for (int i = 0; i < array.length; i++) {
set.add(array[i]);
}
return set.size();
}
}
In this program, we first initialize an array with some duplicate elements. We then call the removeDuplicates method, which takes this array as an argument. Inside this method, we create a HashSet and add all elements of the array to this set. Since a set does not allow duplicate elements, all duplicates are automatically removed. Finally, we return the size of the set, which is the new length of the array without duplicates.
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