Topic Doubly List for Name card Java write a class NameCardj

Topic: Doubly List for Name card (Java)

write a class NameCard.java which has

•Data fields: name (String), age(int), company(String)

•Methods:

•Public String getName();

•Public int getAge();

•Public String getCom();

•Public void setName(String n);

•Public void setAge(int a);

•Public void setCom(String c);

•toString(): \\\\ can be used to output information on this name card

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write a class DoublyNameCardList.java, which is a doubly linked list and each node of the list a name card.

In the DoublyNameCardList.java:

•Data field:
•Reference data type: head, which always references the first node of the doubly linked list
•Reference data type: tail, which aways references the last node of the doubly linked list
•int count, which is used to record the number of name cards in the list
•Method:
•public DoublyNameCardList(); // A constructor which can initialize the list:
•public void addEnd(NameCard x); // A method that allows you to place a value at the end of the list
•public void addHead(NameCard x); // A method that allows you to place a value at the begin of the list

•public void add(int index, NameCard x); //A method that allows you to place a name card after the given location

• public NameCard get(int index); //A method that allows you to retrieve a name card from a given location

•public int size(); // A method that allows you to return the number of elements that is currently in the list

•public void delete (index n); //A method that will remove a name card at the given index

•Public boolean exist(NameCard n); // test if there has a name card in the list which has same content with n

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Now, write a driver program (the class with the public static void main(String[] args) method) name test.java to test the data structure you just created:

• Fill in the list with 5 name card objects

• print the list on the screen two times:

•From head to tail

•From tail to head

•Call the method in the DoublyNameCardList class one by one, each method you called,

•Print out a message to show what have you done

•print out all the name cards in the list

Solution

NameCard.java :

package org.chegg;

public class NameCard {

String name;

int age;

String company;

public String getName() {

return name;

}

public int getAge() {

return age;

}

public String getCom() {

return company;

}

public void setName(String n) {

this.name = n;

}

public void setAge(int a) {

this.age = a;

}

public void setCom(String c) {

this.company = c;

}

public String toString(){

return name+\" \"+age+\" \"+company;

}

}

DoublyNameCradList.java :

package org.chegg;

import java.util.ArrayList;

import java.util.List;

public class DoublyNameCardList{

List<NameCard> list = new ArrayList<NameCard>();

int head;

int tail;

int count;

public DoublyNameCardList(List<NameCard> list){

this.list = list;

tail = 4;

head = 0;

count = list.size();

}

public void addEnd(NameCard x){

list.add(x);

tail = list.size()-1;

head = 0;

count = list.size();

}

public void addHead(NameCard x){

list.add(0,x);

tail = list.size()-1;

head = 0;

count = list.size();

}

public void add(int index,NameCard x){

list.add(index,x);

tail = list.size()-1;

head = 0;

count = list.size();

}

public NameCard get(int index){

return list.get(index);

}

public int size(){

return list.size();

}

public void delete(int index){

list.remove(index);

tail = list.size()-1;

head = 0;

count = list.size();

}

public boolean exist(NameCard n){

if(list.contains(n))

return true;

else

return false;

}

}

test.java :

package org.chegg;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class test {

public static void main(String[] args) {

List<NameCard> li = new ArrayList<NameCard>();

Scanner sc = new Scanner(System.in);

DoublyNameCardList dl = new DoublyNameCardList(li);

for(int i=0;i<5;i++){

NameCard nm = new NameCard();

System.out.println(\"Enter name, age & company fo NameCard \"+ (i+1)+\" :\");

String n = sc.next();

int a = sc.nextInt();

String c = sc.next();

nm.setName(n); nm.setAge(a); nm.setCom(c);

li.add(nm);

}

System.out.println(\"List from Head to Tail:\");

for(int i = dl.head;i<dl.size();i++){

NameCard cd = dl.get(i);

System.out.println(cd.name +\" \"+cd.age+\" \"+cd.company);

}

System.out.println(\"List from Tail to Head:\");

for(int i = dl.tail;i> 0 ;i--){

NameCard cd = dl.get(i);

System.out.println(cd.name +\" \"+cd.age+\" \"+cd.company);

}

NameCard x = new NameCard();

NameCard y = new NameCard();

NameCard z = new NameCard();

x.setName(\"Jack\");x.setAge(20);x.setCom(\"tata\");

y.setName(\"Jane\");x.setAge(21);x.setCom(\"zeal\");

x.setName(\"James\");x.setAge(19);x.setCom(\"indigo\");

dl.addHead(x);

dl.add(4,y);

dl.addEnd(z);

dl.delete(2);

System.out.println(dl.size());

System.out.println(dl.exist(z));

NameCard c = dl.get(3);

System.out.println(c.name +\" \"+c.age+\" \"+c.company);

System.out.println(\"Final List:\");

for (NameCard n : li){

System.out.println(n.name +\" \"+n.age+\" \"+n.company);

}

}

}

Sample Input & Output :

Enter name, age & company fo NameCard 1 :

lakshman 29 kpg

Enter name, age & company fo NameCard 2 :

mahesh 32 pph

Enter name, age & company fo NameCard 3 :

manoj 21 hkp

Enter name, age & company fo NameCard 4 :

kumar 43 esp

Enter name, age & company fo NameCard 5 :

sravan 32 rth

List from Head to Tail:

lakshman 29 kpg

mahesh 32 pph

manoj 21 hkp

kumar 43 esp

sravan 32 rth

List from Tail to Head:

sravan 32 rth

kumar 43 esp

manoj 21 hkp

mahesh 32 pph

lakshman 29 kpg

Name Card Status(if found means true else false):true

Jane 21 zeal

Final List:

James 19 indigo

lakshman 29 kpg

manoj 21 hkp

Jane 21 zeal

kumar 43 esp

sravan 32 rth

Jack 20 tata