{"id":16444,"date":"2023-05-18T05:52:16","date_gmt":"2023-05-18T05:52:16","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=16444"},"modified":"2023-05-18T05:52:16","modified_gmt":"2023-05-18T05:52:16","slug":"java-program-for-removing-duplicates-elements-from-an-array","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/java-program-for-removing-duplicates-elements-from-an-array\/","title":{"rendered":"Java Program for Removing Duplicates Elements from an Array"},"content":{"rendered":"

\"\"<\/p>\n

A collection of items stored in consecutive places in memory is known as an array. The goal is to group objects of the same category for storage. For ease of understanding, consider an array as a series of stairs with a value placed on each level.<\/p>\n

What are Duplicate Elements in an Array?<\/h2>\n

Duplicate elements are those elements that occurred in an array more then once. Let\u2019s take a look at {1,2,3,4,2}, in this example, 2 is having a duplicate element as it is occurring more than once.<\/p>\n

Examples :<\/strong><\/p>\n

Input :<\/strong><\/p>\n

a[] = {1, 1, 2, 2, 2}<\/code><\/pre>\n
Output :<\/strong><\/p>\n
a[] = {1,2}\nnew size = 2<\/code><\/pre>\n
Input :<\/strong><\/p>\n
a[] = {5,2,6,8,6,7,5,2,8}<\/code><\/pre>\n
Output :<\/strong><\/p>\n
a[] = {2,5,6,7,8}\nnew size = 5<\/code><\/pre>\n
Methods for Eliminating Duplicate Elements from an Array<\/h2>\n
Removing duplicate elements from an array can be implemented in various ways. We will discuss 5 different ways to remove duplicate elements from an array.<\/p>\n
    \n
  • Using extra space<\/strong><\/li>\n
  • Constant extra space<\/strong><\/li>\n
  • Using Set<\/strong><\/li>\n
  • Using Frequency Array<\/strong><\/li>\n
  • Using HashMap<\/strong><\/li>\n<\/ul>\n
    Method 1: Removing Duplicate Elements from an Array Using Extra Space<\/h3>\n
    This is how the array duplicates are removed using brute force. This approach makes use of extra space.<\/p>\n
    Algorithm:<\/strong><\/p>\n
      \n
    1. To hold unique elements, make a temporary array called temp[].<\/li>\n
    2. traverse the input array, copying to temp all of a’s distinctive elements where a is the original array. Keep track of the distinct aspects as well. Let j be the count.<\/li>\n
    3. J items are copied from temp[] to a[].<\/li>\n<\/ol>\n
      Note:<\/strong> When the array is sorted, this strategy is appropriate.<\/p>\n
      Code Implementation<\/strong><\/p>\n\t\t\t\t\t\t