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Remove duplicates from arraylist without using collections

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Remove duplicates from arraylist without using collections Posted: Apr 21, 2016 12:31 PM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Remove duplicates from arraylist without using collections
Feed Title: Instance Of Java
Feed URL: http://feeds.feedburner.com/blogspot/TXghwE
Feed Description: Instance of Java. A place where you can learn java in simple way each and every topic covered with many points and sample programs. 		Latest Java Buzz Posts
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1.Write a Java program to remove duplicate elements from an arraylist without using collections (without using set)




  1. package arrayListRemoveduplicateElements;
  2. import java.util.ArrayList;
  3.  
  4. public class RemoveDuplicates {
  6. public static void main(String[] args){
  7.     
  8.     ArrayList<Object> al = new ArrayList<Object>();
  9.     
  10.     al.add("java");
  11.     al.add('a');
  12.     al.add('b');
  13.     al.add('a');
  14.     al.add("java");
  15.     al.add(10.3);
  16.     al.add('c');
  17.     al.add(14);
  18.     al.add("java");
  19.     al.add(12);
  20.     
  21. System.out.println("Before Remove Duplicate elements:"+al);
  22.  
  23. for(int i=0;i<al.size();i++){
  24.  
  25.  for(int j=i+1;j<al.size();j++){
  26.             if(al.get(i).equals(al.get(j))){
  27.                 al.remove(j);
  28.                 j--;
  29.             }
  30.     }
  31.  
  32.  }
  33.  
  34.     System.out.println("After Removing duplicate elements:"+al);
  35.  
  36. }
  39.  
  40. }



Output:

  1. Before Remove Duplicate elements:[java, a, b, a, java, 10.3, c, 14, java, 12]
  2. After Removing duplicate elements:[java, a, b, 10.3, c, 14, 12]

2. Write a Java program to remove duplicate elements from an array using Collections (Linkedhashset)

  1. package arrayListRemoveduplicateElements;
  2.  
  3. import java.util.ArrayList;
  4. import java.util.LinkedHashSet;
  5. import java.util.List;
  6.  
  7. public class RemoveDuplicates {
  9.  
  10. public static void main(String[] args){
  11.     
  12.     List<String>  arraylist = new ArrayList<String>();
  13.     
  14.     arraylist.add("instanceofjava");
  15.     arraylist.add("Interview Questions");
  16.     arraylist.add("Interview Programs");
  17.     arraylist.add("java");
  18.     arraylist.add("Collections Interview Questions");
  19.     arraylist.add("instanceofjava");
  20.     arraylist.add("Java Experience Interview Questions");
  21.     
  22.     
  23.     System.out.println("Before Removing duplicate elements:"+arraylist);
  24.     
  25.     HashSet<String> linkedhashset = new HashSet<String>();
  26.     
  27.     /* Adding ArrayList elements to the LinkedHashSet
  28.      * in order to remove the duplicate elements and 
  29.      * to preserve the insertion order.
  30.      */
  31.     linkedhashset.addAll(arraylist);
  32.  
  33.     // Removing ArrayList elements
  34.     arraylist.clear();
  35.  
  36.     // Adding LinkedHashSet elements to the ArrayList
  37.     arraylist.addAll(linkedhashset);
  38.  
  39.     System.out.println("After Removing duplicate elements:"+arraylist);
  40.  
  41. }
  44.  
  45. }

Output:
 


  1. Before Removing duplicate elements:[instanceofjava, Interview Questions, Interview
  2. Programs, java, Collections Interview Questions, instanceofjava, Java Experience Interview
  3. Questions]
  4. After Removing duplicate elements:[java, Collections Interview Questions, Java Experience
  5. Interview Questions, Interview Questions, instanceofjava, Interview Programs]


arraylist remove duplicates


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