{"id":11710,"date":"2021-03-06T07:01:35","date_gmt":"2021-03-06T14:01:35","guid":{"rendered":"https:\/\/sanuja.com\/blog\/?p=11710"},"modified":"2021-03-07T16:35:27","modified_gmt":"2021-03-07T23:35:27","slug":"java-remove-the-duplicate-elements","status":"publish","type":"post","link":"https:\/\/sanuja.com\/blog\/java-remove-the-duplicate-elements","title":{"rendered":"Java: remove the duplicate elements"},"content":{"rendered":"

Question:<\/b> Write a method that removes the duplicate elements from an array list of integers using the following header:
public static void removeDuplicate(ArrayList list)<\/i><\/p>\n

<\/p>\n

Write a test program that prompts the user to enter 10 integers to a list and displays the distinct integers in their input order separated by exactly one space.<\/p>\n

Warning!<\/strong><\/p> Please import selected Java packages or use import java.util.*;<\/em>. Do not copy my code as per copyright and plagiarism regulations. This Java code is provided as it is for demonstration purposes.<\/div>
\nSolution 1:<\/b><\/p>\n

\r\nimport java.util.Scanner;\r\nimport java.util.ArrayList;\r\npublic class RemoveDuplicate {\r\n  public static void main(String[] args) {\r\n    System.out.print("Enter ten integers: ");\r\n    ArrayList<Integer> list = new ArrayList<>();\r\n    Scanner input = new Scanner(System.in);\r\n    for (int i = 0; i < 10; i++) {\r\n      list.add(input.nextInt());\r\n    }\r\n    removeDuplicate(list);\r\n    \r\n    System.out.print("The distinct integers are ");\r\n    for (int i = 0; i < list.size(); i++)\r\n      System.out.print(list.get(i) + " ");\r\n  }\r\n  public static void removeDuplicate(ArrayList<Integer> list) {\r\n    ArrayList<Integer> temp = new ArrayList<>();\r\n    for (int i = 0; i < list.size(); i++)\r\n      if (!temp.contains(list.get(i)))\r\n        temp.add(list.get(i));\r\n    list.clear();\r\n    for (int i = 0; i < temp.size(); i++)\r\n      list.add(temp.get(i));\r\n  }\r\n}\r\n<\/pre>\n
Solution 2:<\/b><\/p>\n
\r\nimport java.util.Scanner;\r\nimport java.util.ArrayList;\r\n\r\npublic class RemoveDuplicate {\r\n\t\/** Main method *\/\r\n\tpublic static void main(String[] args) {\r\n\t\t\/\/ Create a scanner\r\n\t\tScanner input = new Scanner(System.in);\r\n\r\n\t\t\/\/ Create an ArrayList\r\n\t\tArrayList<Integer> list = new ArrayList<Integer>();\r\n\r\n\t\t\/\/ Prompt ther user to enter 10 integers\r\n\t\tSystem.out.print("Enter 10 integers: ");\r\n\t\tfor (int i = 0; i < 10; i++) {\r\n\t\t\tlist.add(input.nextInt());\r\n\t\t}\r\n\r\n\t\t\/\/ Invoke removeDuplicate method\r\n\t\tremoveDuplicate(list);\r\n\r\n\t\t\/\/ Display the distinct integers\r\n\t\tSystem.out.print("The distinct integers are ");\r\n\t\tfor (int i = 0; i < list.size(); i++) {\r\n\t\t\tSystem.out.print(list.get(i) + " ");\r\n\t\t}\r\n\t\tSystem.out.println();\r\n\t}\r\n\r\n\tpublic static void removeDuplicate(ArrayList<Integer> list) {\r\n\t\tfor (int i = 0; i < list.size() - 1; i++) {\r\n\t\t\tfor (int j = i + 1; j < list.size(); j++) {\r\n\t\t\t\tif (list.get(i) == list.get(j))\r\n\t\t\t\t\tlist.remove(j);\r\n\t\t\t}\r\n\t\t}\r\n\t\tfor (int i = 0; i < list.size() - 1; i++) {\r\n\t\t\tfor (int j = i + 1; j < list.size(); j++) {\r\n\t\t\t\tif (list.get(i) == list.get(j))\r\n\t\t\t\t\tlist.remove(j);\r\n\t\t\t}\r\n\t\t}\t\t\r\n\t}\r\n}\r\n<\/pre>\n
Output:<\/b><\/p>\n
Sample Run 1<\/u>
\nEnter ten integers: 34 5 3 5 6 4 33 2 2 4
\nThe distinct integers are 34 5 3 6 4 33 2<\/p>\n
\ufeffSample Run 2<\/u>
\nEnter ten integers: 3 3 4 4 1 1 2 2 5 5
\nThe distinct integers are 3 4 1 2 5<\/p>\n
Sample Run 3<\/u>
\nEnter ten integers: 1 2 2 3 4 5 6 7 8 8
\nThe distinct integers are 1 2 3 4 5 6 7 8<\/p>\n
Sample Run 4<\/u>
\nEnter ten integers: 5 4 3 2 65 4 4 5 1 5
\nThe distinct integers are 5 4 3 2 65 1<\/p>\n","protected":false},"excerpt":{"rendered":"
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