LinkedList list = new LinkedList();

List.addFirst("a");

List.addFirst("b");

List.addFirst("c");

List.addFirst("d");

List.addLast("e");

System.out.println(list);

ArrayList<Person> list = new ArrayList<Person>();

import java.util.∗;

public class Test {

public int hashCode() {

return 1;

}

public boolean equals(Object b) {

return true;

}

public static void main(String args[]) {

Set set = new HashSet();

Set.add(new Test());

Set.add(new String("ABC"));

Set.add(new Test());

System.out.println(set.size());

}

}

Import java.util.ArrayList;

Import java.util.List;

Public class Test {

Public static void main(String args[]) {

List list = new ArrayList();

List.add(new Test());

List.add(new String("ABC"));

List.add(new Test());

System.out.println(list.size());

}

}