Public Method That Takes Array Of Type Object To Load Strings Into Linked List

Oct 13, 2014

I am having a little trouble with a part of my Java assignment that needs to have linked lists in it.

I need to write a public method that takes an array of type object to load strings into a linked list.

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Invoking Subclass Method On Object In A Linked List

Apr 9, 2014

I am trying to put a reference to a given subclass object into a linked list, and then come back later, and invoke a method of the subclass object that is in a given spot in the linked list. This produces an error because Object does not have that method. Is it necessary to cast the object to the correct subclass every time I want to use one of its methods, or is there a way to convince the JVM to treat it as always of type MySubclass?

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Sort Linked List Through The Nodes Of List - Data Of Calling Object

Feb 14, 2014

I have some class called sorted to sort the linked list through the nodes of the list. and other class to test this ability, i made object of the sort class called "list1" and insert the values to the linked list.

If i make other object called "list2" and want to merge those two lists by using method merge in sort class. And wrote code of

list1.merge(list2);

How can the merge method in sort class know the values of list1 that called it as this object is created in other class.

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Get Object Strings To Print In List So That User Can Select That Object To Manipulate Its Attributes

Oct 7, 2014

I am new to Java and have read books, the Java docs, and searched the Internet for my problem to no avail. I have an Array of objects that contains strings. How can I get the object's strings to print in a list so that the user can select that object to manipulate its attributes? For example, the user can select "Guitar 1" from a list and manipulate its attributes like tuning it, playing it, etc. I have a class called Instruments and created 10 guitar objects.Here is the code:

Instrument [] guitar = new Instrument[10];
for (int i = 0; i < 10; i++) {
guitar[0] = new Instrument("Guitar 1");
guitar[1] = new Instrument("Guitar 2");
guitar[2] = new Instrument("Guitar 3");
guitar[3] = new Instrument("Guitar 4");
guitar[4] = new Instrument("Guitar 5");
guitar[5] = new Instrument("Guitar 6");

[code]...

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How To Convert Input Array Of Type Strings To Class Type

Aug 14, 2014

class Passenger{
String name;
int age;
char gender;
int weight;
public Passenger(){

[Code] ....

This is showing error.....error it gives isthat it cannot change from string type to passenger type......... How to do it??????

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Searching For Object In Linked List Then Removing The Object

Nov 19, 2014

I have just started working with linked lists. I have a linked list of Objects and I want to be able to search for a specific object. But currently my code continues to return false. Also how would I go about removing the first index of the linked list.

public static void main(String[] args) {
LinkedList<Cookies> ml = new LinkedList<>();
int choice = 0;
while (choice >= 0) {
choice = menu();

[Code] ....

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Ordered Linked List Add And Remove With Type Comparable?

Apr 19, 2014

I am working on an assignment that requires me to implement 2 methods (add() and remove()) and create an inner class (OrderedListNode). I must use data items of type Comparable. The items should be sorted.

I understand what needs to be done, but I am having a difficult time actually writing the code. I added the main method to check to see if my code works, and it doesn't seem like that is even being read.It compiles without error - it only gives a warning of unchecked or unsafe operations.

Code:

package dataStructures;
//This class functions as a linked list, but ensures items are stored in ascending order.
public class OrderedLinkedList {
//return value for unsuccessful searches
private static final OrderedListNode NOT_FOUND = null;

[code]...

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Create A Recursion Method That Takes ONLY ARRAY As A Parameter

Mar 9, 2015

so i have this question where it wants me to create a recursion method that takes ONLY THE ARRAY as a parameter, and without using loops or static variables inside the method, and then the method returns the smallest value in that array. However, i tried making the simple if statements where i compare the first element of the array with the second element using the length of the array and decreasing it to get the next elements and compare it again by calling the recursion method, but the problem is when i call the method again, the length does not decrease, even if i store it in a variable, the variable will initialize itself again, and the length wont change.

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Write A Method Called AddToOverThirty Which Takes Array Nums3 As A Parameter

Apr 22, 2014

i have to "Write a method called addToOverThirty which takes the array nums3 as a parameter. It adds 1 to all numbers that have a value greater than 30 in the array.

Add a call to the addToOverThirty method, then display a message telling what the output is followed by the results For example:The nums3 array after adding 1 to all numbers greater than 30 is10 6 15 and so on (check with the values you assigned to nums3)"its pointless because we were told not to make the array have a number over 30.

import java.lang.*;
import java.util.*;
public class LastProject
public static void main(String[] args) {
int nums1[] = new int[15];
int nums2[] = new int[15];
int nums3[] = {5,2,15,8,26,22,1,29,4,23,30,11,19,6,24};

[code]....

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Insert Method Of Linked List

Dec 30, 2014

Is there a particular implementation of a linked list you are referring to in your question?

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Getting Strings To Print In A List So That User Can Select Object To Manipulate Its Attributes

Oct 6, 2014

I have an Array of objects that contains strings. I am new to Java and have read books, the Java docs, and searched the Internet for my problem to no avail. How can I get my strings to print in a list so that the user can select an object to manipulate its attributes? I have a class called Instruments and created 10 guitar objects. Here is the code:

Instrument [] guitar = new Instrument[10];
for (int i = 0; i < 10; i++) {
guitar[0] = new Instrument("Guitar 1");
guitar[1] = new Instrument("Guitar 2");
guitar[2] = new Instrument("Guitar 3");
guitar[3] = new Instrument("Guitar 4");

[Code] ....

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Implement Add Method For Singly Linked List

Apr 26, 2015

Implementing the add(int i, E o) method for a SinglyLinked List.

public void add(int i, E o)
// pre: 0<=i<= size()
// post: adds ith entry of list to o

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Substring Method And Singly Linked List

Jul 16, 2014

I'm still working with the singlylinkedlist data structure and trying to return a string of individual characters stored in each node. ( head--('J')---('A')---('V')---('A')---tail ) Hopefully this beautifully executed depiction to the left will clarify.

This is what I came up with after designing the algorithm w/ pen and paper. I know that I'm not accounting for the OutOfBound errors, an empty list, or an index < 0.... I will get to that.

Right now, I'm not sure why my assignment to the character array, ' chars[i] = cursor.getLink(getElement()); ' , is not working. The two methods getLink and getElement, type Node and T, respectively, exist in my Node class which is a private nested class in MySLList. Why would I be getting the following error: "The method getElement() is undefined for the type StringX" ? Is this a good design and implementation of the substring method?

public String substring(int index) {
char[] chars = new char[(getSize() - index)]; //getSize() defines the size of list in MySLList
Node cursor = null;
//Set the cursor to the node = index
if(cursor == head) {

[Code] ....

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Linked List Queue ToString Method

Oct 21, 2014

So I have to write all the methods for a LinkedListQueue. I've got isEmpty, enqueue and dequeue working correctly (I think) but I'm having trouble with the toString method. I tried to do it recursively and it works if there is only one element in the list, but with multiple elements it throws a StackOverflowerror exception. I've tried it multiple different ways, but I can't seem to figure out how to print it out with out clearing everything. We haven't been taught StringBuilder or .append yet, which I saw a lot of as I was looking for solutions, so I can't use those.

public class LinkedQueue<T>
{
protected LLNode<T> front; // reference to the front of this queue
protected LLNode<T> rear; // reference to the rear of this queue
private T info;
public LinkedQueue()
{
front = null;
rear = null;

[Code] ....

and this is the ITD used with it, for some reason it has the "empty the queue" function as a choice but we weren't assigned that function, so just ignore it.

import java.util.Scanner;
public class ITDLinkedQueue
{
public static void displayMenu()
{
System.out.println("(1) display menu");
System.out.println("(2) check isEmpty");
System.out.println("(3) enqueue");
System.out.println("(4) dequeue");

[Code] ....

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Create Object Of List Type Such As Text File?

Dec 27, 2014

I want to create a program where I need to create an object of list type such as text file will contain nos like 1,2,3,4,5 and write into text file and delete the in FIFO order i.e 1,2,3,4,5...how i can achieve to write a program? I tried bt everytime got concurrent modification exception or Array out of bound exception.

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Writing IndexOf Method For More Than One Instance In A Linked List

Jun 7, 2014

I'm trying to write an indexOf() method that will return every time a value occurs in a linked list. I need to use my user-created linked list not the built in Java linked list. For example in a linked list of characters: "i, p, z, z, n, d, p, z" when I search for "z" it should return position variables for 3, 4, and 8. Currently what I have is obviously only returning the first instance.how I can return more than one instance?

public int indexOf(char input) {
LLNode currentNode = this.first;
int position =1;
boolean found = false;

[code]...

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Adding Array Of Items To Linked List

Sep 21, 2014

I'm having trouble completing my homework. The problem:

>Suppose that you want an operation for the ADT list that adds an array of items to the end of the list. The header of the method could be as follows:
public void addAll(T[] items)

>Write an implementation of this method for the class LinearLinkedList

At first this seemed like an easy problem to me. This is the solution I came up with:

public void addAll(T[] items) {
int length = items.length;
for(int i = 0 ; i < length; i++){
this.addLast(items[index]);
}
}

However, one of the requirements for the assignment is that we're not allowed to use the addLast method. how else to insert items to the Linked List without this method. These are the user-defined LinearLinkedList and ListNode classes we made during class:

**LinearLinkedList**
// Linear linked list class
import java.util.NoSuchElementException;
public class LinearLinkedList {

[code]....

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Method That Print Data Of Single Linked List Backward Using Stack

Apr 23, 2015

I am trying out solving the question but i am stuck.The problem is to write a method that print data of single linked list backward using stack.The question is as follow

public class Stack{
public boolean isEmpty(){};
public void push(int n){};
public int peek(){};
public int pop(){};
}

public class node{
int data;
node next;
}

public class list{
node first;
}

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Nodes Contain Array Data Sets In A Linked List?

Mar 9, 2014

TL,DR: observe the nodes just below, that is the data each node in the link list contains. How do I iterate through the entire list to reach the last element (H), so I can add an element right after it?

So I have 4 nodes doubly linked with two dummy nodes for head and tail:

head
node1 = {A}
node2 = {null, B}
node3 = {C, null, D, E}
node4 = {null, F, null, G, null, null, H, null}
tail

Ok, so since the list only contains 8 elements that are not null, its size is actually 8 correct? So now lets say I have an add method that has

add(E item) and inserts the item at the end of the list. So I can get to the last node with tail.previous(), but then how do I iterate to the end so I can add the item after the last item in the list (H). I guess I don't know how you only access one nodes data when that data is an array with empty spaces.

Here is the entire Node code:

Also, I can't just iterate through the whole thing because I am not supposed to. I am supposed to just find the right node and iterate through that only.how to maneuver around a linked list containing nodes where each node contains an array.

/**
* Node class that makes up a DoublingList. Feel free to add methods /
* constructors / variables you might find useful in here.
*/
public class Node<E> {
 
/**
* The node that comes after this one in the list

[code]....

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Array Of Linked List / Reading From File - Index Out Of Bounce

Oct 17, 2014

I'm trying to read from a file. we made an array of LinkedList and when I'm reading from the file i get a runtime error "index out of bounce in line 66"

import java.lang.*;
import java.util.*;
public class HashTester{
LinkedList_t [] hash;
LinkedList_t [][] doubleHasher;
int size;

[Code] .......

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Display Properties Of Each Object Instead Of Object Array List Itself?

Mar 23, 2015

If I set a Jlist to contain an array of objects, how can I display properties of each object instead of the object array list itself. Ex:

Instead of:

Person1
Person2
Person3

display values such as each person name within the Jlist:

Mike
Paul
Andrew

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Enum Type And Array List

Feb 10, 2015

Here I have an enum class

public enum Money{

ONE_PENNY(1),
TWO_PENCE(2),
FIVE_PENCE(5),
TEN_PENCE(10),
TWENTY_PENCE(20),
FIFTY_PENCE(50),
ONE_POUND(100),
TWO_POUNDS(200);

private int coin;
Money(int c) {
coin = c;
}
int showCoin() {
return coin;
}

and for a test class, I need an array list with a couple of coins in it (i.e. ONE_POUND, TWO_POUNDS) and a loop that adds together the values of the coins in the list and prints the result. How can I do this?

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How To Pass Object Type To A Method / Then Create Instance

Aug 9, 2014

Essentially, the code I want is:

public void randomCreate(ParentObject obj){
int x = random(0-4); //pseudo
int y = random(0-4); //pseudo
create new ParentObj(x,y);
}

ParentObject is actually abstract, so you would only ever pass one of its children objects to it, and a child object of that type would be created. It seems like there should be a way to pass a type, rather than an object, and then create an instance later down, but I don't know if that is actually possible, or if it is poor programming style.

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Public Type (name) Must Be Defined In Its Own File

Apr 1, 2014

I have a small issue understanding the following error message that Eclipse returns when i try to run the following code:

class Film {
String tytul;
String rodzaj;
int ocena;
void odtworz() {
System.out.println("Odtwarzamy film.");

[Code] .....

The message itself reads: "Exception in thread "main" java.lang.Error: Unresolved compilation problem:

at FilmTester.main(Film.java:13)"

and the following on the line where the problem arises:

What gives? I'm positive i'm missing something obvious but i can figure it out why

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Get List / Map Or Array Of A Specific File Type Files In A Directory?

Sep 18, 2014

If I specify the directory in file type or path string type how can I get a list of files that are file type .yml in that folder, so I can loop through and do something with each single file.yml in that specified directory.

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Error / The Public Type Welcomer Must Be Defined In Its Own File

Mar 30, 2014

Why I cannot use 2 public classes like below?

public class Hello {
public static void main(String[] args){
Welcomer welcomer=new Welcomer();
welcomer.sayHello();

[Code] ....

Exception in thread "main" java.lang.Error: Unresolved compilation problem:

The public type Welcomer must be defined in its own file

at Welcomer.<init>(Hello.java:9)
at Hello.main(Hello.java:5)

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