PracticeUp | Java Programming

Output: *** Convert ArrayList to Array *** ArrayList: [ Alee , Ahmed , Kolachi , Mohammad , Umar , Pahore ] Converted to Array : array [0] = Alee array [1] = Ahmed array [2] = Kolachi array [3] = Mohammad array [4] = Umar array [5] = Pahore Click Here For  Java Online Compiler Solution: import java.util.ArrayList ; import java.util.Arrays ; public class ConvertArrayListToArray { public static void main ( String [] args ) { ArrayList < String > arrayList = new ArrayList < String >(); arrayList . add ( "Alee" ); arrayList . add ( "Ahmed" ); arrayList . add ( "Kolachi" ); arrayList . add ( "Mohammad" ); arrayList . add ( "Umar" ); arrayList . add ( "Pahore" ); String [] array = new String [ arrayList . size ()]; arrayList . toArray ( array ); System . out . println ( "...

Output: *** Update Specific Element *** ArrayList At First: [ Rahman , Arshad , Mustafa , Haider , Ameen ] Update "Mustafa" with "Arshad" and "Ameen" with "Aiman" ArrayList After Updation: [ Rahman , Arshad , Zubair , Haider , Aiman ] Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.ArrayList ; public class UpdateElementInArrayList { public static void main ( String [] args ) { ArrayList < String > arrayList = new ArrayList < String >(); System . out . println ( "*** Update Specific Element ***" + "\n" ); arrayList . add ( "Rahman" ); arrayList . add ( "Arshad" ); arrayList . add ( "Mustafa" ); arrayList . add ( "Haider" ); arrayList . add ( "Ameen" ); System . out . print ( "Arr...

Output: *** Retrieve Specific Element From ArrayList *** [ F16sw18 , F16sw40 , F16sw44 , F16sw50 , F16sw84 , F16sw12 ] Second element: F16sw40 Sixth element: F16sw12 Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.ArrayList ; public class RetrieveElementArrayList { public static void main ( String [] args ) { System . out . println ( "*** Retrieve Specific Element From ArrayList ***" + "\n" ); ArrayList < String > arrayList = new ArrayList < String >(); arrayList . add ( "F16sw18" ); arrayList . add ( "F16sw40" ); arrayList . add ( "F16sw44" ); arrayList . add ( "F16sw50" ); arrayList . add ( "F16sw84" ); arrayList . add ( "F16sw12" ); System . out . println ( arrayList ); // Retrive the first and third el...

Output: *** Insert Elements In ArrayList At Specific Position *** [ Audi , BMW , Bigatti , Ferrari , Honda ] Inserting "Toyota" at first position and "Lamborghini" at 4 th position [ Toyota , Audi , BMW , Lamborghini , Bigatti , Ferrari , Honda ] Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.ArrayList ; public class InsertElementAtPositionFirst { public static void main ( String [] args ) { // Creae a list and add some elements to the list ArrayList < String > arrayList = new ArrayList <>(); arrayList . add ( "Audi" ); arrayList . add ( "BMW" ); arrayList . add ( "Bigatti" ); arrayList . add ( "Ferrari" ); arrayList . add ( "Honda" ); System . out . println ( "*** Insert Elements In ArrayList At Specific Position ***" ...

Output: *** Iterate All Elements In ArrayList *** Iterating ... Orange Apple Banana Pomegranate Mango Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.* ; public class IterateElementsArrayList { public static void main ( String [] args ) { // Creae a list and add some strings to the list List < String > arrayList = new ArrayList < String >(); System . out . println ( "*** Iterate All Elements In ArrayList ***" + "\n" ); System . out . println ( "Iterating..." ); System . out . println (); arrayList . add ( "Orange" ); arrayList . add ( "Apple" ); arrayList . add ( "Banana" ); arrayList . add ( "Pomegranate" ); arrayList . add ( "Mango" ); // Print the list for ( String s : arrayList ) { ...

Output: *** Convert Array to ArrayList *** Converted to ArrayList: [ Alee , Ahmed , Shakoor , Umar , Anwar , Jawad ] Click Here For  Java Online Compiler Solution: import java.util.ArrayList ; import java.util.Arrays ; public class ConvertArrayToArrayList { public static void main ( String [] args ) { String [] array = new String []{ "Alee" , "Ahmed" , "Shakoor" , "Umar" , "Anwar" , "Jawad" }; ArrayList < String > list = new ArrayList < String >( Arrays . asList ( array )); System . out . println ( "*** Convert Array to ArrayList ***" + "\n" ); System . out . println ( "Converted to ArrayList: " ); System . out . println ( list ); } }

Output: *** Create ArrayList *** [ Sadaquat , Ali , Ruk , Geeks , Academy , Hyderabad ] Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.* ; public class CreateArrayList { public static void main ( String [] args ) { //creating an arraylist List < String > arrayList = new ArrayList (); System . out . println ( "*** Create ArrayList ***" + "\n" ); arrayList . add ( "Sadaquat" ); arrayList . add ( "Ali" ); arrayList . add ( "Ruk" ); arrayList . add ( "Geeks" ); arrayList . add ( "Academy" ); arrayList . add ( "Hyderabad" ); System . out . println ( arrayList ); } }

Output: *** Check Whether ArrayList Is Empty Or Not *** Original array list: [ Alee , Anwar , Shakoor , Umar , Sarmad ] --> Checking the above array list is empty or not ! false Array list after remove all elements [] --> Checking the above array list is empty or not ! true Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.ArrayList ; public class ArrayListEmptyOrNot { public static void main ( String [] args ) { System . out . println ( "*** Check Whether ArrayList Is Empty Or Not ***" + "\n" ); ArrayList < String > arrayList = new ArrayList <>(); arrayList . add ( "Alee" ); arrayList . add ( "Anwar" ); arrayList . add ( "Shakoor" ); arrayList . add ( "Umar" ); arrayList . add ( "Sarmad" ); System . out . println ( "Origi...

Output: *** Iterate LinkedList In Reverse Order *** Original linked list: [1998, 2000, 2010, 2012, 2018] Linked List in Reverse Order: 2018 2012 2010 2000 1998 Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.LinkedList ; import java.util.Iterator ; public class IterateLinkedListInReverse { public static void main ( String [] args ) { LinkedList < String > linkedList = new LinkedList <>(); System . out . println ( "*** Iterate LinkedList In Reverse Order ***" + "\n" ); linkedList . add ( "1998" ); linkedList . add ( "2000" ); linkedList . add ( "2010" ); linkedList . add ( "2012" ); linkedList . add ( "2018" ); System . out . println ( "Original linked list: " + linkedList ); Iterator it = linkedList . desce...

Output: *** Iterate Through All Elements Of LinkedList *** Iterating Elements of LinkedList ... Java HTML CSS JavaScript PHP Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.LinkedList ; public class IterateThroughElements { public static void main ( String [] args ) { LinkedList < String > linkedList = new LinkedList <>(); linkedList . add ( "Java" ); linkedList . add ( "HTML" ); linkedList . add ( "CSS" ); linkedList . add ( "JavaScript" ); linkedList . add ( "PHP" ); System . out . println ( "*** Iterate Through All Elements Of LinkedList ***" + "\n" ); System . out . println ( "Iterating Elements of LinkedList..." + "\n" ); for ( String element : linkedList ) { System . out . println ( elem...

Output: *** HashSet Creation *** The Hash Set: [ Red , White , Pink , Yellow , Black , Green ] Click Here For  Java Online Compiler Solution: /** * * @author Alee Ahmed Kolachi */ import java.util.HashSet ; public class DemoHashSet { public static void main ( String [] args ) { HashSet < String > h_set = new HashSet <>(); h_set . add ( "Red" ); h_set . add ( "Green" ); h_set . add ( "Black" ); h_set . add ( "White" ); h_set . add ( "Pink" ); h_set . add ( "Yellow" ); System . out . println ( "*** HashSet Creation ***" + "\n" ); System . out . println ( "The Hash Set: " + h_set ); } }