Java Programming with Collection
1.
Write a Java program to
display use of below methods from Collection interface. (Create collections
like ArrayList and show output of below methods. Understand the use of those
methods).
Methods:
add(), addAll(), clear(), clearAll(), remove(), removeAll(), contains(),
retainAll()
import java.util.*;
public class ArrayListExample {
public static void main(String[] args) {
ArrayList<String> collection1
= new ArrayList<String>();
collection1.add("Bhavnagar");
collection1.add("Surat");
collection1.add("Bhuj");
collection1.add("Ahemadabad");
System.out.println("\n Using add() method \n "+collection1);
ArrayList<String> list1
= new ArrayList<String>();
list1.add("Jamnagar");
list1.add("Virpur");
list1.add("Jetpur");
collection1.addAll(list1);
System.out.println("\n Using addAll() method \n "+collection1);
collection1.clear();
System.out.println("\n using clear() method \n "+collection1);
ArrayList<String> list2
= new ArrayList<String>();
list2.add("Bharuch");
list2.add("Aanand");
list2.add("Morbi");
list2.add("Porbandar");
list2.remove("Morbi");
System.out.println("\n Using remove() method \n "+list2);
ArrayList<String> list3
= new ArrayList<String>();
list3.add("Rajkot");
list3.add("Kheda");
list2.addAll(list3);
list2.removeAll(list3);
System.out.println("\n Using removeAll() method \n "+list2);
System.out.println("\n Using contain() method \n "+list2.contains(list3));
System.out.println("\n "+list2.contains("Aanand"));
ArrayList<String> list4
= new ArrayList<String>();
list4.add("Aanand");
list4.add("Rajkot");
list4.add("Tapi");
list4.retainAll(list3);
System.out.println("\n Using retainAll() method \n "+list4);
}
}
OUTPUT :
2. Create an Iterator for above any one of the ArrayList created in
above program. Display the use oftraversing the list through Iterat
or.
CODE :
import java.util.*;
public class IteratorEx {
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<>();
list.add("Junagadh");
list.add("Rajkot");
list.add("Botad");
list.add("Bhavnagar");
list.add("Bhuj");
list.add("Morbi");
System.out.println("List is: \n"+ list);
Iterator<String> iter = list.iterator();
System.out.println("\nThe iterator values of list are: ");
while (iter.hasNext()) {
System.out.println(iter.next() + " ");
}
}
}
OUTPUT :
3.Write a Java program to create a Queue and display use of below
methods.
Methods: offer(), poll(), peek(), remove()
CODE :
import java.util.*;
public class Example {
public static void main(String[] args) {
Queue<String> q = new LinkedList<String>();
System.out.println("Using offer() :-" + q);
q.offer("Rajkot");
System.out.println(q);
q.offer("Rajula");
System.out.println(q);
q.offer("Tapi");
System.out.println(q);
q.offer("Bharuch");
System.out.println(q);
q.offer("Daman");
System.out.println(q);
System.out.println("The queue is: " + q);
System.out.println( "\nUsing peek() :-\nPeek is "+q.peek());
System.out.println("\nUsing poll() :- ");
q.poll();
System.out.println("The queue is: " + q);
System.out.println( "Peek is "+q.peek());
System.out.println("\nUsing remove() :- ");
String s = "Tapi";
q.remove(s);
System.out.println("Tapi is removed from queue ");
System.out.println("The queue is: " + q);
System.out.println( "Peek is "+q.peek());
}
}
OUTPUT :
4.Write a program to use below methods of java.util.Collections.
Method: sort(), binarySearch(), shuffle(), reverse(), copy(),
max(), min(), disjoint(), frequency()
CODE :import java.util.Collections;
import java.util.ArrayList;
import java.util.List;
public class CollectionsDemo {
public static void main(String[] args) {
ArrayList<String> List = new ArrayList<String>();
List.add("Rajkot");
List.add("Surat");
List.add("Bhuj");
List.add("Cat");
List.add("Ajay");
List.add("Rad");
List.add("Surat");
System.out.println("List :- \n" + List);
Collections.sort(List);
System.out.println("\nUsing sort() method :-\n" + List);
System.out.println("\nUsing sort() method :-");
int index = Collections.binarySearch(List, "Cat");
System.out.println("Index of Cat :- "+index);
index = Collections.binarySearch(List, "bat");
System.out.println("Index of bat :- "+index);
Collections.shuffle(List);
System.out.println("\nUsing shuffle() mehod :-\n" + List);
Collections.reverse(List);
System.out.println("\nUsing reverse() method :-\n" + List);
System.out.println("\nUsing max() method :-\n"+Collections.max(List));
System.out.println("\nUsing min() method :-\n"+Collections.min(List));
System.out.println("\nUsing frequency() method :-");
System.out.println("Frequency of Neeraj is "+
+ Collections.frequency(List, "Neeraj"));
System.out.println("Frequency of Surat is "+
+ Collections.frequency(List, "Surat"));
ArrayList<String> List2 = new ArrayList<String>();
List2.add("Bhavnagar");
List2.add("Valsad");
List2.add("Rocket");
System.out.println("\nList2 :- \n" + List2);
System.out.println("\nUsing disjoint() method :-");
System.out.println("List1 and List2 are disjoint :- " + Collections.disjoint(List, List2));
Collections.copy(List, List2);
System.out.println("\nUsing copy() method :-"); System.out.println("\nList :- " + List);
System.out.println("\nList2 :- " + List2);
System.out.println("\nList1 and List2 are disjoint :- " + Collections.disjoint(List2,List));
}
}
OUTPUT :
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