Java : Collection Framework : ArrayList Hierarchy

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Java : Collection Framework : LinkedList (Remove Group of Objects)

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LinkedListRemoveAllExample.java

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

/*
 * Example of removeAll(Collection<?> c) method
 */
public class LinkedListRemoveAllExample
{

    public static void main(String[] args)
    {
        LinkedList<String> linkedList = new LinkedList<String>();
        linkedList.add("Ram");
        linkedList.add("Dave");
        linkedList.add("Peter");
        linkedList.add("Julia");
        linkedList.add("Akram");

        System.out.println("linkedList : " + linkedList + "\n");

        List<String> removeList = new ArrayList<String>();
        removeList.add("Dave");
        removeList.add("Peter");

        System.out.println("RemoveList : " + removeList + "\n");

        /*
         * Remove group of elements from the linkedList
         */

        linkedList.removeAll(removeList);

        System.out
                .println("linkedList After removing elements which are present in the removeList : "
                        + linkedList + "\n");

    }

}

Output

linkedList : [Ram, Dave, Peter, Julia, Akram]

RemoveList : [Dave, Peter]

linkedList After removing elements which are present in the removeList : [Ram, Julia, Akram]

To Download LinkedListDemoRemoveAll Project Click the below link

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Java : Collection Framework : LinkedList (Remove Object)

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LinkedListRemoveExample.java

import java.util.LinkedList;

/*
 * Example of remove(int index) and remove(Object o) methods
 */
public class LinkedListRemoveExample
{

    public static void main(String[] args)
    {
        LinkedList<String> linkedList = new LinkedList<String>();
        linkedList.add("Ram");
        linkedList.add("Dave");
        linkedList.add("Peter");
        linkedList.add("Julia");
        linkedList.add("Akram");

        System.out.println("linkedList : " + linkedList + "\n");

        /*
         * Remove element from the index position 1.
         */

        linkedList.remove(1);

        System.out
                .println("linkedList After removing element from the index 1 : "
                        + linkedList + "\n");

        /*
         * Remove the String object Julia.
         */

        linkedList.remove("Julia");

        System.out
                .println("linkedList After removing String object \"Julia\" : "
                        + linkedList);
    }

}

Output

linkedList : [Ram, Dave, Peter, Julia, Akram]

linkedList After removing element from the index 1 : [Ram, Peter, Julia, Akram]

linkedList After removing String object "Julia" : [Ram, Peter, Akram]

To Download LinkedListDemoRemove Project Click the below link

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Java : Collection Framework : LinkedList (Add Group of Objects based on Index)

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LinkedListAddAllIndexBasedExample.java

import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;

/*
 * Example of addAll(Collection<? extends E> c) method
 */
public class LinkedListAddAllIndexBasedExample
{

    public static void main( String[] args )
    {
        LinkedList<Integer> linkedList = new LinkedList<Integer>();
        linkedList.add(1);
        linkedList.add(2);
        linkedList.add(3);

        System.out.println("linkedList : " + linkedList);

        Set<Integer> set = new HashSet<Integer>();
        set.add(4);
        set.add(5);

        System.out.println("set : " + set);
        
        /*
         * In Position 1 adding Set collection elements to the list collection
         */

        linkedList.addAll(1,set);

        System.out.println("linkedList : " + linkedList);
    }

}

Output

linkedList : [1, 2, 3]
set : [4, 5]
linkedList : [1, 4, 5, 2, 3]

To Download LinkedListDemoAddAllIndex Project Click the below link

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Java : Collection Framework : LinkedList (Add Object based on Index)

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LinkedListAddIndexBasedExample.java

import java.util.LinkedList;

/*
 * Example of add(int index, E element) method
 */
public class LinkedListAddIndexBasedExample
{

    public static void main( String[] args )
    {
        LinkedList<Integer> linkedList = new LinkedList<Integer>();
        linkedList.add(1);
        linkedList.add(2);
        linkedList.add(3);

        System.out.println("linkedList : " + linkedList);

        /*
         * In Position 2 adding 10
         */

        linkedList.add(2, 10);

        System.out.println("linkedList : " + linkedList);

    }

}

Output

linkedList : [1, 2, 3]
linkedList : [1, 2, 10, 3]

To Download LinkedListDemoAddIndex Project Click the below link

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Java : Collection : LinkedList Sample Programs or Examples - Playlist

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Java : Collection : LinkedList - Playlist

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Java : Collection : ArrayList : ListIterator - Playlist

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Java : Collection : ArrayList : Iterator - Playlist

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Java : Collection Framework : LinkedList (Constructors)

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Java : Collection Framework : LinkedList

Java : Collection Framework : LinkedList

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Java : Collection Framework : LinkedList (Add Group of Objects)

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LinkedListAddAllListExample.java

import java.util.LinkedList;

/*
 * Example of addAll(Collection<? extends E> c) method
 */
public class LinkedListAddAllListExample
{

    public static void main( String[] args )
    {
        LinkedList<Integer> linkedList1 = new LinkedList<Integer>();
        linkedList1.add(1);
        linkedList1.add(2);
        linkedList1.add(3);

        System.out.println("linkedList1 : " + linkedList1);

        LinkedList<Integer> linkedList2 = new LinkedList<Integer>();
        linkedList2.add(4);
        linkedList2.add(5);

        System.out.println("linkedList2 : " + linkedList2);

        /*
         * Adding linkedList2 collection elements to the linkedList1 collection
         */

        linkedList1.addAll(linkedList2);

        System.out.println("linkedList1 : " + linkedList1);
    }

}

Output

linkedList1 : [1, 2, 3]
linkedList2 : [4, 5]
linkedList1 : [1, 2, 3, 4, 5]

LinkedListAddAllSetExample.java

import java.util.HashSet;
import java.util.LinkedList;
import java.util.Set;

/*
 * Example of addAll(Collection<? extends E> c) method
 */
public class LinkedListAddAllSetExample
{

    public static void main( String[] args )
    {
        LinkedList<Integer> linkedList = new LinkedList<Integer>();
        linkedList.add(1);
        linkedList.add(2);
        linkedList.add(3);

        System.out.println("linkedList : " + linkedList);

        Set<Integer> set = new HashSet<Integer>();
        set.add(4);
        set.add(5);

        System.out.println("Set : " + set);

        /*
         * Adding Set collection elements to the list collection
         */

        linkedList.addAll(set);

        System.out.println("linkedList : " + linkedList);

    }

}

Output

linkedList : [1, 2, 3]
Set : [4, 5]
linkedList : [1, 2, 3, 4, 5]

To Download LinkedListDemoAddAll Project Click the below link

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Java : Collection Framework : LinkedList (Add User Defined Object)

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Student.java

public class Student
{

    private String name;
    private int age;

    public Student(String name, int age)
    {
        super();
        this.name = name;
        this.age = age;

    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }

    @Override
    public String toString()
    {
        return "Student [name=" + name + ", age=" + age + "]";
    }

}

LinkedListExample.java

import java.util.LinkedList;

/*
 * Storing user-defined class objects.
 */
public class LinkedListExample
{

    public static void main(String[] args)
    {
        LinkedList<Student> linkedList = new LinkedList<Student>();

        Student john = new Student("John", 32);
        Student david = new Student("David", 42);
        Student peter = new Student("Peter", 52);

        linkedList.add(john);
        linkedList.add(david);
        linkedList.add(peter);

        /*
         * Using for each loop getting each student object from the linkedList
         */
        for (Student student : linkedList)
        {
            System.out.println(student.toString());
        }
    }
}

Output

Student [name=John, age=32]
Student [name=David, age=42]
Student [name=Peter, age=52]

To Download LinkedListDemoUserDefined Project Click the below link

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Java : Collection Framework : LinkedList (Get each element using for-each loop)

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LinkedListForEachExample.java

import java.util.LinkedList;

public class LinkedListForEachExample
{

    public static void main( String[] args )
    {
        LinkedList<Integer> linkedList = new LinkedList<Integer>();

        linkedList.add(100);
        linkedList.add(200);
        linkedList.add(300);
        linkedList.add(400);

        /*
         * Using for-each loop getting each element from the linkedList.
         */

        for( Integer value : linkedList )
        {
            System.out.println(value);
        }

    }

}

Output

100
200
300
400

To Download LinkedListDemoForeach Project Click the below link

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Java : Collection Framework : LinkedList (Add Object)

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LinkedListExample.java

import java.util.LinkedList;
/*
 * Example of add(E e) method.
 */
public class LinkedListExample
{

    public static void main( String[] args )
    {
        LinkedList<Integer> linkedList = new LinkedList<Integer>();

        /*
         * Appends the specified element to the end of this list.
         */
        linkedList.add(100);
        linkedList.add(200);
        linkedList.add(300);
        linkedList.add(400);

        System.out.println("linkedList : "+linkedList);
    }

}

Output

linkedList : [100, 200, 300, 400]

To Download LinkedListDemoAdd Project Click the below link

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Java : Collection Framework : ArrayList (Add or Replace element using ListIterator)

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ArrayListExample.java

import java.util.ArrayList;
import java.util.ListIterator;

/*
 * Example of add(E e) and set(E e) methods of ListIterator
 */
public class ArrayListExample
{

    public static void main( String[] args )
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("arrayList : " + arrayList + "\n");

        ListIterator<String> listIterator = arrayList.listIterator();

        /*
         * Using ListIterator move the cursor in forward direction and add
         * element and replace element.
         */

        while( listIterator.hasNext() )
        {

            int indexPosition = listIterator.nextIndex();
            if( indexPosition == 2 )
            {
                /*
                 * Inserts the specified element into the list
                 */
                listIterator.add("Virat");
            }
            String name = listIterator.next();
            if( name.equalsIgnoreCase("Ram") )
            {
                /*
                 * Replaces the last element returned by next() or previous()
                 * with the specified element
                 */
                listIterator.set("Stephan");
            }

        }

        System.out.println("List : " + arrayList + "\n");

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

List : [Stephan, Dave, Virat, Peter, Julia, Akram]

To Download ArrayListDemoListIteratorAddSet Project Click the below link

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Java : Collection Framework : ArrayList (ListIterator Index)

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ArrayListExample.java

import java.util.ArrayList;
import java.util.ListIterator;

/*
 * Example of listIterator(int index) method
 */
public class ArrayListExample
{

    public static void main(String[] args)
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("arrayList : " + arrayList + "\n");

        ListIterator<String> listIterator = arrayList.listIterator(2);

        /*
         * Using ListIterator move the cursor in forward direction and get each
         * element.
         */

        System.out.println("Forward Direction -----" + "\n");

        while (listIterator.hasNext())
        {
            int nextIndex = listIterator.nextIndex();
            String name = listIterator.next();
            System.out.println(nextIndex + " : " + name);

        }

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

Forward Direction -----

2 : Peter
3 : Julia
4 : Akram

To Download ArrayListDemoListIteratorIndex Project Click the below link

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Java : Collection Framework : ArrayList (Remove elements using ListIterator)

Click here to watch in Youtube : https://www.youtube.com/watch?v=oEz-vQ-b2RY

ArrayListExample.java

import java.util.ArrayList;
import java.util.ListIterator;

/*
 * Example of remove() method of ListIterator
 */
public class ArrayListExample
{

    public static void main(String[] args)
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("arrayList : " + arrayList + "\n");

        ListIterator<String> listIterator = arrayList.listIterator();

        /*
         * Using ListIterator move the cursor in forward direction and remove
         * element one by one.
         */

        while (listIterator.hasNext())
        {

            listIterator.next();
            /*
             * Removes from the list the last element that was returned by
             * next() or previous() methods
             */
            listIterator.remove();

        }

        System.out.println("arrayList : " + arrayList + "\n");

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

arrayList : []

To Download ArrayListDemoListIteratorRemove Project Click the below link

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Java : Collection Framework : ArrayList (ListIterator)

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ArrayListExample.java

import java.util.ArrayList;
import java.util.ListIterator;

/*
 * Example of how to use ListIterator
 */
public class ArrayListExample
{

    public static void main( String[] args )
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("arrayList : " + arrayList + "\n");

        ListIterator<String> listIterator = arrayList.listIterator();

        /*
         * Using ListIterator move the cursor in forward direction and get each
         * element.
         */

        System.out.println("Forward Direction -----" + "\n");

        while( listIterator.hasNext() )
        {
            int nextIndex = listIterator.nextIndex();
            String name = listIterator.next();
            System.out.println(nextIndex + " : " + name);

        }

        System.out.println("\n" + "##############################" + "\n");

        /*
         * Using ListIterator move the cursor in reverse direction and get each
         * element.
         */

        System.out.println("Reverse Direction -----" + "\n");

        while( listIterator.hasPrevious() )
        {
            int previousIndex = listIterator.previousIndex();
            String name = listIterator.previous();
            System.out.println(previousIndex + " : " + name);
        }

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

Forward Direction -----

0 : Ram
1 : Dave
2 : Peter
3 : Julia
4 : Akram

##############################

Reverse Direction -----

4 : Akram
3 : Julia
2 : Peter
1 : Dave
0 : Ram

To Download ArrayListDemoListItrerator Project Click the below link

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Java : Collection Framework : ArrayList (Remove elements using Iterator)

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ArrayListIteratorRemoveExample.java

import java.util.ArrayList;
import java.util.Iterator;

/*
 * Example of Iterator remove() method
 */
public class ArrayListIteratorRemoveExample
{

    public static void main( String[] args )
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("arrayList : " + arrayList + "\n");

        Iterator<String> iterator = arrayList.iterator();

        while( iterator.hasNext() )
        {
            iterator.next();
            /*
             * Removes from the list the last element that was returned by
             * next()
             */
            iterator.remove();
        }

        System.out.println("arrayList : " + arrayList + "\n");

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

arrayList : []

To Download ArrayListDemoItrRemove Project Click the below link

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Java : Collection Framework : ArrayList (Convert to Array Object)

Click here to watch in Youtube : https://www.youtube.com/watch?v=1s_oAM0_SVs

ArrayListToArrayExample.java

import java.util.ArrayList;

/*
 * Example of toArray(T[] a) method
 */
public class ArrayListToArrayExample
{

    public static void main(String[] args)
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("ArrayList : " + arrayList + "\n");

        String[] strArray = new String[arrayList.size()];

        /*
         * arrayList elements will be copied to StrArray
         */

        arrayList.toArray(strArray);

        for (String name : strArray)
        {
            System.out.println(name);
        }

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

Ram
Dave
Peter
Julia
Akram

ArrayListToObjArrayExample.java

import java.util.ArrayList;

/*
 * Example of toArray() method
 */
public class ArrayListToObjArrayExample
{

    public static void main( String[] args )
    {
        ArrayList<String> arrayList = new ArrayList<String>();
        arrayList.add("Ram");
        arrayList.add("Dave");
        arrayList.add("Peter");
        arrayList.add("Julia");
        arrayList.add("Akram");

        System.out.println("arrayList : " + arrayList + "\n");

        /*
         * Returns an array containing all of the elements in this list in
         * proper sequence (from first to last element).
         */

        Object[] objArray = arrayList.toArray();

        for( Object object : objArray )
        {
            String name = (String) object;
            System.out.println(name);
        }

    }

}

Output

arrayList : [Ram, Dave, Peter, Julia, Akram]

Ram
Dave
Peter
Julia
Akram

To Download ArrayListDemoToArray Project Click the below link

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