Question

java

Write a generic method that takes an ArrayList of objects (of a valid concrete object type) and returns a new ArrayList containing no duplicate elements from the original ArrayList. The method signature is as follows: public static ArrayList UniqueObjects(ArrayList list) Test the method with at least 2 array lists of different concrete object types. Label your outputs properly and show the array lists content before and after calling method UniqueObjects

Answer 1

RemoveDuplicates.java

import java.util.ArrayList;

public class RemoveDuplicates {

public static void main(String[] args) {

//Creating an ArrayList

ArrayList arl1=new ArrayList();

//Adding Elements to ArrayList

arl1.add(34);

arl1.add(34);

arl1.add(32);

arl1.add(45);

arl1.add(65);

arl1.add(56);

arl1.add(54);

arl1.add(98);

arl1.add(54);

arl1.add(98);

System.out.println("ArrayList#1 Before Removing Duplicates :");

System.out.println(arl1);

arl1=UniqueObjects(arl1);

System.out.println("ArrayList#1 After Removing Duplicates :");

System.out.println(arl1);

//Creating an ArrayList

ArrayList arl2=new ArrayList();

//Adding Elements to ArrayList

arl2.add(35);

arl2.add(37);

arl2.add(22);

arl2.add(35);

arl2.add(37);

arl2.add(89);

arl2.add(43);

arl2.add(32);

arl2.add(78);

arl2.add(65);

System.out.println("ArrayList#2 Before Removing Duplicates :");

System.out.println(arl2);

arl2=UniqueObjects(arl2);

System.out.println("ArrayList#2 After Removing Duplicates :");

System.out.println(arl2);

}

//This method will elimnates the duplicate Elements in the ArrayList

public static ArrayList UniqueObjects(ArrayList list)

{

ArrayList arl=new ArrayList();

for(int i=0;i<list.size();i++)

{

if(!arl.contains(list.get(i)))

arl.add(list.get(i));

}

return arl;

}

}

________________

Output:

ArrayList#1 Before Removing Duplicates :
[34, 34, 32, 45, 65, 56, 54, 98, 54, 98]
ArrayList#1 After Removing Duplicates :
[34, 32, 45, 65, 56, 54, 98]
ArrayList#2 Before Removing Duplicates :
[35, 37, 22, 35, 37, 89, 43, 32, 78, 65]
ArrayList#2 After Removing Duplicates :
[35, 37, 22, 89, 43, 32, 78, 65]

______________Thank You