Remove Duplicate Elements From ArrayList Using HashSet In Java

Chapter: Interview Programs Last Updated: 26-08-2016 14:25:29 UTC

Program:

            /* ............... START ............... */
                
import java.util.ArrayList;
import java.util.HashSet;

public class JavaDuplicateElementsRemoval {

	public static void main(String[] args) {

		ArrayList<String> listWithDuplicateElements = new ArrayList<String>();

		listWithDuplicateElements.add("JAVA");

		listWithDuplicateElements.add("J2EE");

		listWithDuplicateElements.add("JSP");

		listWithDuplicateElements.add("SERVLETS");

		listWithDuplicateElements.add("JAVA");

		listWithDuplicateElements.add("STRUTS");

		listWithDuplicateElements.add("JSP");

		System.out.print("ArrayList With Duplicate Elements :");

		System.out.println(listWithDuplicateElements);

		HashSet<String> set = new HashSet<String>(listWithDuplicateElements);

		ArrayList<String> listWithoutDuplicateElements = new ArrayList<String>(set);

		System.out.print("ArrayList After Removing Duplicate Elements :");

		System.out.println(listWithoutDuplicateElements);
	}
}
                /* ............... END ............... */
        

Output

ArrayList With Duplicate Elements :[JAVA, J2EE, JSP, SERVLETS, JAVA, STRUTS, JSP]
ArrayList After Removing Duplicate Elements :[JAVA, SERVLETS, JSP, J2EE, STRUTS]

Tags

Remove Duplicate Elements From ArrayList, Java, Interview Programs

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