Java Programming Assignment, Project Help - Codersarts

Updated: Mar 18




Java Programming Assignment, Homework, Project Help- Codersarts
Java Programming Assignment, Homework, Project Help- Codersarts

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List of topics we provide in Java programming Assignment.



COLLECTION IN JAVA


Collection in java is a structure that gives a design to store and control the gathering of objects


Java List Interface

List Interface is the sub interface of Collection. It contains methods to insert and erase components in record basis. It is a production line of List Iterator interface.

List Interface declaration

public interface ListInterface<E> extends Collection<E>

METHOD FOR LIST INTERFACE

  • void add(int index, Object element):It is utilised to embed component into the summoning list at the file go in the list.

  • boolean add All(int index, Collection c) : It is utilised to embed all components of c into the summoning list at the record go in the file.

  • question get(int index): It is utilised to restore the protest put away at the predefined record inside the conjuring gathering.

  • protest set(int index,Object element) :It is utilised to relegate component to the area indicated by list inside the conjuring list.

  • protest remove(int index) :It is utilised to expel the component at position record from the summoning rundown and restore the erased component.

  • ListIterator listIterator(): It is utilised to restore an iterator to the beginning of the conjuring list.

  • ListIterator listIterator(int index) : It is utilised to restore an iterator to the conjuring list that starts at the predefined record.



import java.util.*;

public class List{

public static void main(String args[]) {

ArrayList<String> Le=new ArrayList<String>();

le.add("Amin");

le.add("saif");

le.add(“ammar");

le.add(1,"peter");

System.out.println("Element at 2nd position: "le.get(2));

for(String sa:al){

System.out.println(sa);

}

}

}


LINKED LIST:


Java LinkedList class utilises doubly connected rundown to store the components. It gives a connected rundown information structure. It acquires the AbstractList class and actualizes List and Deque interfaces.

  • It can contain duplicate elements.

  • It maintains insertion order.

  • It is non synchronised.

  • It allows random access memory.




DECLARATION OF ARRAY CLASS:


public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, Serializable


import java.util.*;

class TestCa{

public static void main(String args[]) {

ArrayList<String> lista1=new ArrayList<String>(); //Creating arraylist

Lista1.add("Ravi"); //Adding object in arraylist

Lista1.add("ahmed");

Lista1.add("ali");

Lista1.add("peter");


//Traversing list through Iterator

Iterator itra = list.iterator();

while(itra.hasNext()) {

System.out.println(itra.next());

}

}

}



LIST INTERFACE


List Interface is the sub interface of Collection. It contains techniques to embed and erase components in list basis. It is a plant of List Iterator interface.


List Interface

public interface List<E> extends Collection<E>

METHOD OF LIST INTERFACE:

  • void add(int index, Object element): It is used to insert all elements into the list at the time when index passed.

  • boolean addAll(int index,Collection c) :It can insert various elements of c

  • object get(int index) : It can return the object stored at the given index

  • object set(int index,Object element) :It can give value to element to the location allocated by the index

  • object remove(int index) :It can remove the element at same index.

  • ListIterator listIterator(): It can return an iterator to the start from the list.

  • ListIterator listIterator(int index) :It can return an iterator from the list that starts at the specified index.

import java.util.*;

public class ListExample {

public static void main(String args[]){

ArrayList<String> ll=new ArrayList<String>();

ll.add("Amit");

ll.add("Vijay");

ll.add("Kumar");

ll.add(1,"Sachin");

System.out.println("Element at 2nd position: "+ll.get(2));

for(String se:ll){

System.out.println(se);

}

}

}

HASHSET:

Java HashSet class is another property for collection that makes a hash table to store the data in memory. It can inherits all the Abstract classes and implements Set interface.

The important points to notice are:

  • HashSet stores the elements by a process called hashing.

  • HashSet cannot allow duplicates.



B/W between List and Set


List allows duplicate elements whereas Set only contains unique elements in the set.


Method Description

void clear(): It can remove all of the elements from this set.

boolean contains(Object o): Its return true if this set have the element.

boolean add(Object o): It can add specified element to set if the element is not there.

boolean isEmpty(): It can return true if set have no elements.

boolean remove(Object o): It can remove one single element from set.

Object clone(): It can return copy of HashSet elements.

Iterator iterator(): It can only return iterator over the elements.

int size(): It can return multiple number of elements from the hashset.



import java.util.*;

class HashSet {

public static void main(String args[]){


//Creating HashSet and adding elements

HashSet<String> set1=new HashSet<String>();

Set1.add("jay");

Set1.add("peter");

Set1.add("jj");

Set1.add("hamed");

//Traversing elements

Iterator<String> itra = set1.iterator();

while(itra.hasNext()) {

System.out.println(itra.next());

}

}

}



TREE SET:


TreeSet can implement only the Set interface. It can use a tree structure to store data into heap memory. It can also inherits Abstract classes method. The main points to be highlighted are



The important points about TreeSet class are:

  • No duplicates allowed in the set

  • Access time is fast

  • Ascending order matters.


TreeSet Declaration

public class TS<E> extends AbstractSet<E> implements NavigableSet<E>, Cloneable, Serializable


Example of the Code:

import java.util.*;

class TestCollection11{

public static void main(String args[]){

//Creating and adding elements

TreeSet<String> ali=new TreeSet<String>();

ali.add("Ravi");

ali.add("Vijayyyyyy");

ali.add("Raviiiii");

ali.add("Ajayyyy");

//Traversing elements

Iterator<String> itra=ali.iterator();

while(itra.hasNext()){

System.out.println(itra.next());

}

}

}

HASH MAP


HashMap can implement map interface by hashtable. It can inherits Abstract Map classes and can also implements Map interface.

The important points to be highlighted are:

  • HashMap contains key.

  • No duplicates.

  • Only one null key and null values.

  • Contains no order.


import java.util.*;

class HashMap{

public static void main(String args[]){

HashMap<Integer,String> hma=new HashMap<Integer,String>();

hma.put(100,”tahir");

hma.put(101,"Shah");

hma.put(102,"shahrukh");

for(Map.Entry ma:hma.entrySet()){

System.out.println(ma.getKey()+" "+ma.getValue());

}

}

}

TREE MAP:


TreeMap class only implement the TreeMap interfaces by making a tree. It can store key/value pairs in sorted order.

The important points o be highlighted are:

  • TreeMap occurs values based towards the key. NavigableMap can also be implemented can also implement interface and Abstract Map classes can also be extended.

  • Only unique elements.

  • Null values are many in the tree map.

  • HashMap is same as TreeMap.


DECLARATION OF THE TREEMAP


public class TreeMap<K,V> extends AbstractMap<K,V> implements NavigableMap<K,V>, Cloneable, Serializable


import java.util.*;

class TestC {

public static void main(String args[]) {

TreeMap<Integer,String> tma=new TreeMap<Integer,String>();

tma.put(10,”smith");

tma.put(20,"paul");

tma.put(101,"rancho");

tma.put(103,"Raju");


for(Map.Entry ma:tma.entrySet()) {

System.out.println(ma.getKey()+" "+ma.getValue());

}

}

}


Hashtable


Hash table class can only implement hash table. It can implement the Map interface and dictionary class. It can produce maps keys to values


The important points to be highlighted are

  • It is an array of list as a bucket. It can called by hashcode() method. It can only contain values based on the key.

  • No duplicates allowed.

  • Only null key or value.

  • Synchronized form.




DECLARATION OF THE HASHTABLE:


public class Hashtable<K,V> extends Dictionary<K,V> implements Map<K,V>, Cloneable, Serializable


import java.util.*;

class TestCT . {

public static void main(String args[]){

Hashtable<Integer,String> htaa=new Hashtable<Integer,String>();

htaa.put(100,"Amit");

htaa.put(102,"Ravi");

htaa.put(101,"Vijay");

htaa.put(103,"Rahul");

for(Map.Entry ma:htaa.entrySet()) . . {

System.out.println(ma.getKey()+" "+ma.getValue());

}

}

}



Sorting in Collection


Elements of sorting are :

  1. String objects

  2. Wrapper class.

Collections for sort the elements of collection by providing static methods.


We can treeSet for set type. We cannot sort the elements of List. This class sorts the elements of list type elements.


Sorting List elements Method:


public void sort(List list): can sort the elements of List.



import java.util.*;

class Sort . {

public static void main(String args[]){

ArrayList<String> ts=new ArrayList<String>();

ts.add("CodersArts.com");

ts.add("Sofstack.com");

ts.add("Mukesh");

ts.add("Tahir");

Collections.sort(ts);

Iterator itraa=ts.iterator();

while(itraa.hasNext()) . {

System.out.println(itraa.next());

}

}

}



INTERFACE CLASSES:


An interface is a reference type in Java. Class is similar to reference. abstract methods is inherited to interface classes. An interface inherit a class therefore also inherit the abstract methods of the interface.

  • An interface may also contain constants, default methods, static methods, and nested types with a reference of abstract method.

  • Method bodies contains only for default methods and static methods.

  • Writing a class is similar to performing an interface.

  • The attributes of class and behaviours of an object Is declared by a class.

  • Class implements behaviour that contains interface.

ABSTRACT CLASSES


Abstract classes are classes rather than interface. Their usage is expensive because at the time you inherit there is a look-up.


abstract class Vehicle {

int fuelofVehicle;

// They ALL have fuel, so lets implement this for everybody.

int getfuel() {

return this.fuelofVehicle;

}

// That can be very different, force them to provide their

// own implementation.

abstract void runable();

}

class Car extends VehicleMotor {

void runable() {

print("swift");

}

}


Implementation of Abstract classes and interfaces both have separate implementation.

  • It can only have methods without a body, constants member and well-defined methods, whereas interfaces can have constants and method without a body.

  • Abstract class be defined as a visibility of any method and members, whereas in interface all methods is declared as public but they are defined as default(public) if you don’t write public in method.

  • In abstract methods a child class must be there in order to inherit a abstract class, It can also extend one class to another abstract class and can also implement abstract methods from the parent class that doesn’t need to be defined as it is defined by default method.

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