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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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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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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Nov 19, 2014

I am trying to get this to where I can type in a name and it will search through each object and print back the corresponding object info.

Java Code:

import java.util.Scanner;
public class MyPeople {
public static void main(String[] args) {
Person[] p = new Person[] {
new Person("Chris", 26, "Male", "NJ", "Single"),
new Person("JoAnna", 23, "Female", "NJ", "Single"),
new Person("Dana", 24, "Female", "NJ", "Single"),
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[code]....

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Apr 9, 2014

Task:The main method of the class Things below creates an object called printer deriving from the class PrintingClass and uses that object to print text. Your task is to write the PrintingClass class.

Program to complete:
import java.util.Scanner;
public class Things {
public static void main(String args[]) {
String characterString;
Scanner reader = new Scanner(System.in);
PrintingClass printer = new PrintingClass();
System.out.print("Type in the character string for printing: ");
characterString = reader.nextLine();
printer.Print(characterString);
}
}

// Write the missing class here

Note: In this exercise the solution is part of a conversion unit where many classes have been declared. Because of this the classes are not declared as public using the public attribute.

Example output

Type in the character string for printing: John Doe

John Doe

My Class:
class PrintingClass {
public void print(){
System.out.println(characterString);
}
}

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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:

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Person2
Person3

display values such as each person name within the Jlist:

Mike
Paul
Andrew

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

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Aug 18, 2014

I have two different "business objects", and they have multiple attributes in common(around 25 I believe, all of which are simply a String). Basically, these objects are used for documentation purposes on the same file.

The program can choose to update a given Document at any point in time, even if changes haven't been made to existing version. So what I'm trying to do, is check to see if these attributes differ any between the two files(the exisitng copy, and the new request). If so, I'll update...else I simply throw out the request. The workload can be rather intense at times so I don't want to bog down the system anymore then necessary.

Simply pulling down every attribute for each and comparing seems like a lot of overhead, any more efficient way to achieve these results?

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Dec 29, 2014

public class BookExamples {
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[code]...

Eclipse gives me an error for b1.genre = "hey"; saying "Syntax error on token "genre", VariableDeclaratorId expected after this token". I am learning from a HeadFirst Java book that is all in Java 5.0 version which may be part of the problem.

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Jun 24, 2014

I am trying to have a user select from a printed out array list, instead of having the user type in the "bill type" each time there is a bill to avoid user error as much as possible. For example I would like to have it print out like this:

"Select bill type from list:

1. Rent
2. Car
3. etc..."

and I would like the user to choose a number and not type in the "bill type". I don't want to use "Switch case" because it would need to be an expanding and I don't think "switch case" can do that.

Here is the code:

package homebudget;
class Spending
{
//Do i need a totalAmount variable?
String type;
double amount;
int year, month, day;
public Spending()

[Code] ....

case 2:
//Give option to enter a new expense or pick from list.
//How to do this? If Statement that doesn't list duplicates, or a while search?

resp = JOptionPane.showInputDialog("Enter the type of expense:");
type = resp;
resp = JOptionPane.showInputDialog("Enter the amount of the expense:");
amount = Double.parseDouble(resp);

[Code] .....

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I am having an issue with using FileWriter to print some text to a text file. In the following code, I am supposed to be able to print the initial attributes and the user changed inputs into a file but all I am getting is the memory locations of the objects I created in one long line.

package project3final;
import java.io.*;
import java.util.*;
public class Project3Final {
static class Instrument {
char [] stringNames = {'E', 'A', 'D', 'G', 'B', 'E'};
private final String instrumentName;

[Code] .....

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Feb 14, 2014

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Dec 4, 2014

I have some data files that take this form:

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[code]...

I also have this code that takes the file, goes through each line using a loop and counts the total of all the integers on each line, it also then loops and takes each integer on each line and divides it by the total calculated in the previous loop but I don't know what code to manipulate the strings to do these calculations. After these calculations I want to write the updated values to the text file I originally took the data in from. So as an example the total I already for this file to be '232' so the first line would be D 0.06 because 14/232 = 0.06034482758 and rounded to 2 decimal points is 0.06.

import java.io.File;
import java.io.FileReader;
import java.io.LineNumberReader;
import java.io.PrintWriter;
import java.util.Scanner;
public class Normalise {
private static Scanner scanner;
//private static PrintWriter out;

[code]....

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Mar 28, 2014

Create an equals method that takes an object reference and returns true if the given object equals this object.

Hint: You'll need 'instanceof' and cast to a (Geocache)

So far I have:

public boolean equals(Object O){
if(O instanceof Geocache){
Geocache j=(Geocache) O;
if (this.equals(j)) //I know this is wrong... but I can't figure it out
return true;
}

else return false;
}

I think I have it correct up to the casting but I don't understand what I'm suppose to do with the this.equals(). Also I'm getting an error that I'm not returning a boolean... I get this all the time in other problems. I don't get why since I have to instances of returning booleans in this. "returns true if the given object equals this object" makes no sense to me. I assume the given object, in my case, is 'O'. What is 'this' object referring to?

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Nov 7, 2014

i have a class that creates an object made of 2 strings and an arraylist

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private String ip;
private String userName;
private ArrayList <String>cons=new ArrayList();
Users(String i_p,String un,ArrayList con){//construc

[Code] .....

This object then gets returned to an arraylist of these objects

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My question is how can i then get the arraylist from this object to print its contents?

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first i looked at this example and understand this fine:

import java.util.ArrayList;
import java.util.Iterator;
public class Main {

[Code]....

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May 5, 2014

Suppose that you have an ArrayList and that it contains String objects. Which declaration of the ArrayList requires that objects retrieved using the get method be cast to Strings before calling a String method?

I. ArrayList a = new ArrayList();
II. ArrayList<Object> a = new ArrayList<Object>;
III. ArrayList<String> a = new ArrayList<String>;

A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III

I know that all of these are ways to declare an Array List, but I am unfamiliar with the last two since I usually just declare my Array Lists with the first option.

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Sep 3, 2014

I am following those three tutorials and I have completed it with success.

( [URL] .... )
( [URL] .... )
( [URL] .... )

But then, as author haven't implemented removeCountries method I tried to create it. What I did initially was to just add to class Countries this method:

public boolean removeCountry(Country country) {
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}

But although compiler wasn't complaining it didn't work. Actually it worked last night (before reboot) but not today. Must be some SOAP iterator/binding thing or whatever. Or I thought that it worked but in fact it didn't.

Here are original classes:

//-------------------------------
public class Country {
String CountryId;
String CountryName;
public Country() {
super();

[Code] ....

I would like to avoid my own iterator as JDeveloper can generate automatically iterators for webservices, but if I can't get it that way, what would be better way to write above mentioned iterator in removeCountry method?

Is there any way to remove object directly with something like this:

co.countries.remove(o);
co.removeCountry(country)

using method

// This left unused
public boolean removeCountry(Country country) {
return countries.remove(country);
}

from class Countries?

Parameters should be set by web service iterator.

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My list of documents is called List<CountryDocs> selectedDocs;

<h:form>
<p:dataTable value="#{countryDocBean.selectedDocs}" var="docs">
<p:commandLink id="download" value="Download" ajax="false">
<p:fileDownload value="#{countryDocBean.downloadedFile}"
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[Code] ....

Clicking on the download link calls the following method in my managed bean:

@ManagedBean(name = "countryDocBean")
@SessionScoped
public class CountryDocBean {
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public StreamedContent getDownloadedFile() {

[Code] ....

Debugging shows the value for the id is 0 and this results in a NullPointerException. I've tried several methods for grabbing the document id in my backing bean, but no luck yet. I also read about the the ViewParams and ViewAction method but they caused validation errors to do with the <f:metadata> tags. I don't know how to obtain this value using a normal List object.

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import java.util.List;
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[Code] ....
 
What is the most efficient way to group the preferences of the same type, In other word I want just a print statement to print this line.
 
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