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samar
Java ArrayList
4 Answer(s)      4 years ago
Posted in : Java Interview Questions


How to declare unique ArrayList ?

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October 30, 2010 at 4:01 PM


Hi,

Here is the program of Unique ArrayList.

import java.util.ArrayList;

public class ArrayListExample {
public static void main(String[] args) {
        ArrayList<Object>  arrList = new ArrayList<Object>();
        String str1 = new String("Bharat");
        String str2 = new String("Gyan");
        String str4 = new String("Bikrant");
        Integer i = new Integer(22);
        System.out.println("Size of ArrayList is :" + arrList.size());
        System.out.println("Element in array list : " + arrList);
        arrList.add(str1);
        arrList.add(str2);
        arrList.add(i);
        arrList.add(str4);
        System.out.println("Size of ArrayList is :" + arrList.size());
        System.out.println("Element in array list : " + arrList);
        System.out.println("Object at index 1 : " + arrList.get(1));
        arrList.clear();
        System.out.println("Size of ArrayList after clear method :"
                        + arrList.size());
        System.out.println("Element in array list after clear method : "
                        + arrList);
        }
}


May 5, 2011 at 12:23 AM


Actually i donot understand how it is unique can u explain.



June 21, 2011 at 1:39 PM


What do you mean by unique here ? Can you please clarify if you are looking for some basicjava arraylist stuff then check here ? would be able to help more if you clarify your question.



March 19, 2012 at 4:20 PM


Override the add methods in ArrayList as follows.

public class UniqueChildAList extends ArrayList<Object> {

@Override
public boolean add(Object arg0) {
    if (this.contains(arg0)) {
        return false;
    }
    return super.add(arg0);
}

}



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