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Java program to remove duplicates elements from a List
To remove duplicates from a List, the code is as follows −
Example
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.Set;
public class Demo {
public static void main(String[] args){
ArrayList<String> list = new ArrayList<String>();
list.add("Jacob");
list.add("Gary");
list.add("Gary");
list.add("Harry");
list.add("Harry");
list.add("Kevin");
System.out.println("List = "+list);
Set<String> set = new LinkedHashSet<String>(list);
System.out.println("List after removing duplicate elements = "+set);
}
}Output
List = [Jacob, Gary, Gary, Harry, Harry, Kevin] List after removing duplicate elements = [Jacob, Gary, Harry, Kevin]
Example
Let us now see another example −
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class Demo {
public static void main(String[] args){
List<String> list = new ArrayList<String> (Arrays.asList("Ryan","Kevin","Ryan","Harry","Mark","Mark"));
System.out.println("ArrayList = "+list);
List<String> list2 = list.stream()
.distinct()
.collect(Collectors.toList());
System.out.println("Updated ArrayList without duplicates = "+list2);
}
}Output
ArrayList = [Ryan, Kevin, Ryan, Harry, Mark, Mark] Updated ArrayList without duplicates = [Ryan, Kevin, Harry, Mark]
Updated on: 02-Jan-2020
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