Garmaine asked 3 years ago
The first 3 sets of code are from the same task which gives me errors. I have been trying for a couple weeks to find a solution to inputing strings into a linked list and i finally found a solution, so what I have tried to do is combine the solution i found along with the code i had written up prior to me researching and it still doesnt seem to work. any help would be greatly appreciated
package step2;
import java.util.Scanner;
public class Step2 {
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
Scanner scan = new Scanner(System.in);
/* Creating object of BST */
System.out.println("Binary Search Tree Test\n");
char ch;
/* Perform tree operations */
do
{
System.out.println("\nBinary Search Tree Operations\n");
System.out.println("1. insert ");
System.out.println("2. delete");
System.out.println("3. search");
System.out.println("4. count nodes");
System.out.println("5. check empty");
System.out.println("6. display Binary Tree");
System.out.print("Please enter option: ");
int choice = scan.nextInt();
switch (choice)
{
case 1 :
do{
LinkedList<Employee> linkedList = new LinkedList<Employee>(); // creation of Linked List
System.out.print("Enter employee name: ");
String name = scan.nextLine();
System.out.print("Enter employee position: ");
String position = scan.nextLine();
linkedList.insertFirst(new Employee( name, position));
linkedList.displayLinkedList(); // display LinkedList
//display deleted Node.
System.out.println("\nDo you want to continue (Type y or n) \n");
ch = scan.next().charAt(0);
} while (ch == 'Y'|| ch == 'y');
break;
case 2 :
System.out.print("Deleted Nodes: ");
Node<Employee> deletedNode = linkedList.deleteFirst(); //delete Node
deletedNode.displayNode(); //display deleted Node.
deletedNode = linkedList.deleteFirst(); //delete Node.
deletedNode.displayNode();
break;
case 3 :
break;
case 4 :
break;
case 5 :
break;
case 6 :
break;
default :
System.out.println("Wrong Entry \n ");
break;
}
System.out.println("\nDo you want to continue (Type y or n) \n");
ch = scan.next().charAt(0);
} while (ch == 'Y'|| ch == 'y');
}
}
and this
package step2;
class Employee {
private String name;
private String position;
public Employee(String name, String position) {
this.name = name;
this.position = position;
}
@Override
public String toString() {
return "Employee [name=" + name + ", position=" + position + "] ";
}
}
class LinkedListEmptyException extends RuntimeException{
public LinkedListEmptyException(){
super();
}
public LinkedListEmptyException(String message){
super(message);
}
}
class Node<T> {
public T data;
public Node<T> next;
public Node(T data){
this.data = data;
}
public void displayNode() {
System.out.print( data + " ");
}
}
class LinkedList<T> {
private Node<T> first;
public LinkedList(){
first = null;
}
public void insertFirst(T data) {
Node<T> newNode = new Node<T>(data);
newNode.next = first;
first = newNode;
}
public Node<T> deleteFirst()
{
if(first==null){
throw new LinkedListEmptyException("LinkedList doesn't contain any Nodes.");
}
Node<T> tempNode = first;
first = first.next;
return tempNode;
}
public void displayLinkedList() {
System.out.print("Displaying LinkedList: ");
Node<T> tempDisplay = first;
while (tempDisplay != null){
tempDisplay.displayNode();
tempDisplay = tempDisplay.next;
}
System.out.println();
}
}
and this is part 3 of my code
package step2;
class linkedList {
static Node<Employee> deleteFirst() {
throw new UnsupportedOperationException("Not supported yet.");
}
}
this is the code i took from
package singlylinkedlistgenericexample;
import java.util.Scanner;
class Employee {
private String name;
private String position;
public Employee(String name, String position) { // constructor
this.name = name;
this.position = position;
}
@Override
public String toString() {
return "Employee [name=" + name + ", position=" + position + "] ";
}
}
class LinkedListEmptyException extends RuntimeException{
public LinkedListEmptyException(){
super();
}
public LinkedListEmptyException(String message){
super(message);
}
}
class Node<T> {
public T data;
public Node<T> next;
public Node(T data){
this.data = data;
}
public void displayNode() {
System.out.print( data + " ");
}
}
class LinkedList<T> {
private Node<T> first;
public LinkedList(){
first = null;
}
public void insertFirst(T data) {
Node<T> newNode = new Node<T>(data);
newNode.next = first;
first = newNode;
}
public Node<T> deleteFirst()
{
if(first==null){ //means LinkedList in empty, throw exception.
throw new LinkedListEmptyException("LinkedList doesn't contain any Nodes.");
}
Node<T> tempNode = first;
first = first.next;
return tempNode;
}
public void displayLinkedList() {
System.out.print("Displaying LinkedList [first--->last]: ");
Node<T> tempDisplay = first;
while (tempDisplay != null){
tempDisplay.displayNode();
tempDisplay = tempDisplay.next;
}
System.out.println();
}
}
public class SinglyLinkedListGenericExample {
public static void main(String[] args) {
char ch;
do{
LinkedList<Employee> linkedList = new LinkedList<Employee>(); // creation of Linked List
Scanner scan = new Scanner(System.in);
System.out.print("Enter employee name: ");
String name = scan.nextLine();
System.out.print("Enter employee position: ");
String position = scan.nextLine();
linkedList.insertFirst(new Employee( name, position));
linkedList.displayLinkedList(); // display LinkedList
System.out.println("\nDo you want to continue (Type y or n) \n");
ch = scan.next().charAt(0);
} while (ch == 'Y'|| ch == 'y');
}
}
and this is the error message i am getting:
ant -f C:\\Users\\McClu\\Desktop\\desktop\\JaveMainCoursework\\step2\\step2 -
Dnb.internal.action.name=run run
init:
Deleting:
C:\Users\McClu\Desktop\desktop\JaveMainCoursework\step2\step2\build\built-
jar.properties
deps-jar:
Updating property file:
C:\Users\McClu\Desktop\desktop\JaveMainCoursework\step2\step2\build\built-
jar.properties
compile:
run:
Binary Search Tree Test
Binary Search Tree Operations
1. insert
2. delete
3. search
4. count nodes
5. check empty
6. display Binary Tree
Please enter option: 1
Exception in thread "main" java.lang.NoClassDefFoundError: step2/linkedList (wrong name: step2/LinkedList)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:821)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:719)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:642)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:600)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at step2.Step2.main(Step2.java:41)
C:\Users\McClu\Desktop\desktop\JaveMainCoursework\step2\step2\nbproject\build-impl.xml:1330: The following error occurred while executing this line:
C:\Users\McClu\Desktop\desktop\JaveMainCoursework\step2\step2\nbproject\build-impl.xml:936: Java returned: 1
BUILD FAILED (total time: 3 seconds)
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