Java Collections Framework
practice.

In Java, which method is used to add an element to a collection in the Java Collections Framework?

What is the purpose of the `toArray()` method in the Java Collections Framework?

In the Java Collections Framework, which class provides methods to manipulate the size of a list and its elements?

What is the purpose of the `Iterator` interface in the Java Collections Framework?

Which method is used to remove all elements from a collection in the Java Collections Framework?

What is the purpose of the `Map.Entry` interface in the Java Collections Framework?

In the Java Collections Framework, which method is used to obtain a synchronized (thread-safe) version of a collection?

What is the primary difference between a `HashSet` and a `LinkedHashSet` in the Java Collections Framework?

In Java, which method is used to obtain a synchronized (thread-safe) map from an existing map in the Java Collections Framework?

What is the purpose of the `Collections.reverse()` method in the Java Collections Framework?

Which of these method can be used to increase the capacity of ArrayList object manually?

What will be the output of the following Java code snippet?

import java.util.*;
class Linkedlist 
{
    public static void main(String args[]) 
    {
        LinkedList obj = new LinkedList();
        obj.add("A");
        obj.add("B");
        obj.add("C");
        obj.addFirst("D");
        System.out.println(obj);
    }
}

What is Collection in Java?

Which of these methods can convert an object into a List?

What will be the output of the following Java program?

import java.util.*;
class Maps 
{
    public static void main(String args[]) 
    {
        HashMap obj = new HashMap();
        obj.put("A", new Integer(1));
        obj.put("B", new Integer(2));
        obj.put("C", new Integer(3));
        System.out.println(obj.get("B"));
    }
}

What is the premise of equality for IdentityHashMap?

Which of these is static variable defined in Collections?

Which of these methods is used to add elements in vector at specific location?

What will be the output of the following Java program?

import java.util.*;
class Collection_Algos 
{
    public static void main(String args[]) 
    {
        LinkedList list = new LinkedList();
        list.add(new Integer(2));
        list.add(new Integer(8));
        list.add(new Integer(5));
        list.add(new Integer(1));
        Iterator i = list.iterator();
        Collections.reverse(list);
  Collections.sort(list);
        while(i.hasNext())
      System.out.print(i.next() + " ");
    }
}

What is the difference between Queue and Stack?