Could you help me pleas , this is my code I want change it to insert...
Could you help me pleas , this is my code I want change it to insert student by user , and i have problem when i want append name it just one time i can't append or present more one.
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import java.util.Iterator;
import java.util.Scanner;
public class studentDLLTest {
static int getChoice() {
Scanner in = new Scanner(System.in);
int choice;
do {
System.out.print("\nYour choice? : ");
choice = in.nextInt();
} while (choice < 1 || choice > 9);
return choice;
}
public static void PrompetText() {
System.out.println("Insert Method code to test it
:\ncode\t\tmethod:\n*************************************");
System.out.println("(1):\t\tAppend");
System.out.println("(2):\t\tprepend");
System.out.println("(3):\t\tExtractFirst");
System.out.println("(4):\t\tExtractLast");
System.out.println("(5):\t\tExtract Student");
System.out.println("(6):\t\tinsert after");
System.out.println("(7):\t\tinsert before");
System.out.println("(8):\t\tQuite");
}
public static void SLLOperations(StudentLinkedList myGroup)
{
Scanner in = new Scanner(System.in);
int choise;
do {
choise = getChoice();
switch (choise) {
case 1: {
System.out.println("Enter Student Name followed by Reg.
Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
myGroup.append(s);
}
break;
case 2: {
System.out.println("Enter Student Name followed by Reg.
Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
myGroup.prepend(s);
}
break;
case 3: {
myGroup.extractFirst();
}
break;
case 4: {
myGroup.extractLast();
}
break;
case 5: {
System.out.print("Enter Student Name you want to delete:");
String name = in.nextLine();
myGroup.extract(name);
}
break;
case 6: {
System.out.print("Enter New Student Name followed by Reg.
Number::");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert
after it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertAfter(s);
}
break;
case 7: {
System.out.print("Enter New Student Name followed by Reg.
Number::");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert
Before it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertBefore(s);
}
}
break;
}
} while (choise != 8);
}
public static void DLLOperations(StudentDLinkedList myGroup)
{
Scanner in = new Scanner(System.in);
int choise;
do {
choise = getChoice();
switch (choise) {
case 1: {
System.out.println("Enter Student Name followed by Reg.
Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
myGroup.append(s);
}
break;
case 2: {
System.out.println("Enter Student Name followed by Reg.
Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
myGroup.prepend(s);
}
break;
case 3: {
myGroup.extractFirst();
}
break;
case 4: {
myGroup.extractLast();
}
break;
case 5: {
System.out.print("Enter Student Name you want to delete:");
String name = in.nextLine();
myGroup.extract(name);
}
break;
case 6: {
System.out.print("Enter New Student Name followed by Reg.
Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert
after it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentDLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertAfter(s);
}
break;
case 7: {
System.out.print("Enter New Student Name followed by Reg.
Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert
Before it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentDLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertBefore(s);
}
break;
}
}
} while (choise != 8);
}
public static void main(String[] args) {
Student[] s = new Student[3];
s[0] = new Student("A ", 1);
s[1] = new Student("EB",00344 );
s[2] = new Student("BAS IRI", 100334);
Scanner in = new Scanner(System.in);
System.out.println("please Enter Linked List
Type:\n(1)SingluLinkedList\n(2)DoublyLinkedList ");
int choise = in.nextInt();
switch (choise) {
case 1: {
StudentLinkedList myGroup = new StudentLinkedList();
for (int i = 0; i < s.length; i++) {
myGroup.insert(s[i]);
}
PrompetText();
SLLOperations(myGroup);
}
break;
case 2: {
StudentDLinkedList myGroup = new StudentDLinkedList();
for (int i = 0; i < s.length; i++) {
myGroup.insert(s[i]);
}
PrompetText();
DLLOperations(myGroup);
}
break;
}
}
}
Homework Answers
Please find the modified code below.
CODE
import java.util.Iterator;
import java.util.Scanner;
public class studentDLLTest {
static int getChoice() {
Scanner in = new Scanner(System.in);
int choice;
do {
System.out.print("\nYour choice? : ");
choice = in.nextInt();
} while (choice < 1 || choice > 9);
return choice;
}
public static void PrompetText() {
System.out.println("Insert Method code to test it :\ncode\t\tmethod:\n*************************************");
System.out.println("(1):\t\tAppend");
System.out.println("(2):\t\tprepend");
System.out.println("(3):\t\tExtractFirst");
System.out.println("(4):\t\tExtractLast");
System.out.println("(5):\t\tExtract Student");
System.out.println("(6):\t\tinsert after");
System.out.println("(7):\t\tinsert before");
System.out.println("(8):\t\tQuite");
}
public static void SLLOperations(StudentLinkedList myGroup) {
Scanner in = new Scanner(System.in);
int choise;
do {
choise = getChoice();
switch (choise) {
case 1: {
System.out.println("Enter Student Name followed by Reg. Number:");
String name = in.nextLine();
int id = in.nextInt();
in.nextLine();
Student s = new Student(name, id);
myGroup.append(s);
}
break;
case 2: {
System.out.println("Enter Student Name followed by Reg. Number:");
String name = in.nextLine();
int id = in.nextInt();
in.nextLine();
Student s = new Student(name, id);
myGroup.prepend(s);
}
break;
case 3: {
myGroup.extractFirst();
}
break;
case 4: {
myGroup.extractLast();
}
break;
case 5: {
System.out.print("Enter Student Name you want to delete:");
String name = in.nextLine();
myGroup.extract(name);
}
break;
case 6: {
System.out.print("Enter New Student Name followed by Reg. Number::");
String name = in.nextLine();
int id = in.nextInt();
in.nextLine();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert after it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertAfter(s);
}
break;
case 7: {
System.out.print("Enter New Student Name followed by Reg. Number::");
String name = in.nextLine();
int id = in.nextInt();
in.nextLine();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert Before it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertBefore(s);
}
}
break;
}
} while (choise != 8);
}
public static void DLLOperations(StudentDLinkedList myGroup) {
Scanner in = new Scanner(System.in);
int choise;
do {
choise = getChoice();
switch (choise) {
case 1: {
System.out.println("Enter Student Name followed by Reg. Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
myGroup.append(s);
}
break;
case 2: {
System.out.println("Enter Student Name followed by Reg. Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
myGroup.prepend(s);
}
break;
case 3: {
myGroup.extractFirst();
}
break;
case 4: {
myGroup.extractLast();
}
break;
case 5: {
System.out.print("Enter Student Name you want to delete:");
String name = in.nextLine();
myGroup.extract(name);
}
break;
case 6: {
System.out.print("Enter New Student Name followed by Reg. Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert after it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentDLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertAfter(s);
}
break;
case 7: {
System.out.print("Enter New Student Name followed by Reg. Number:");
String name = in.nextLine();
int id = in.nextInt();
Student s = new Student(name, id);
System.out.println("Enter the Current Name of Student to insert Before it :");
Scanner x = new Scanner(System.in);
String sname = x.nextLine();
StudentDLinkedList.Node temp = myGroup.searchByName(sname);
temp.insertBefore(s);
}
break;
}
}
} while (choise != 8);
}
public static void main(String[] args) {
Student[] s = new Student[3];
s[0] = new Student("A ", 1);
s[1] = new Student("EB",00344 );
s[2] = new Student("BAS IRI", 100334);
Scanner in = new Scanner(System.in);
System.out.println("please Enter Linked List Type:\n(1)SingluLinkedList\n(2)DoublyLinkedList ");
int choise = in.nextInt();
switch (choise) {
case 1: {
StudentLinkedList myGroup = new StudentLinkedList();
for (int i = 0; i < s.length; i++) {
myGroup.insert(s[i]);
}
PrompetText();
SLLOperations(myGroup);
}
break;
case 2: {
StudentDLinkedList myGroup = new StudentDLinkedList();
for (int i = 0; i < s.length; i++) {
myGroup.insert(s[i]);
}
PrompetText();
DLLOperations(myGroup);
}
break;
}
}
}
NOTE: If you still get the same error, please help to provide me the code for other classes like Student.java, StudentDLinkedList.java, StudentDLinkedList.Node, StudentLinkedList.java so that I can replicate the issue in my local environment and debug the issue.
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