JSF :: How To Display List Of Strings
Apr 1, 2014
I have figured out, how to diplay basic datatypes of an entity / object in a dataTable, but I can't find a way to display a List<String>.
I also tried it with ui:repeat, but the space, where it should appear, stays empty. This is my code right now:
Product.java (the entity)
...
@ElementCollection
@CollectionTable(name="NeededRessources", joinColumns=@JoinColumn(name="product_id"))
@Column(name="resource")
private List<String> neededResources;
...
And the page: index.xhtml
<ui:repeat value="#{product.neededResources}" var="t">
#{t}
</ui:repeat>
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Jan 24, 2015
So I need to be able to find the longest increasing sequence in a 2D grid of numbers. A sequence is simply a series of adjacent squares. Squares may not be used twice. Example here.
97 47 56 36 60 31 57 54 12 55
35 57 41 13 82 80 71 93 31 62
89 36 98 75 91 46 95 53 37 99
25 45 26 17 15 82 80 73 96 17
75 22 63 96 96 36 64 31 99 86
12 80 42 74 54 14 93 17 14 55
14 15 20 71 34 50 22 60 32 41
90 69 44 52 54 73 20 12 55 52
39 33 25 31 76 45 44 84 90 52
94 35 55 24 41 63 87 93 79 24
The longest sequence has length 10, consisting of entries (row, column) as follows;
(5,0) with cost 12
(6,0) with cost 14
(6,1) with cost 15
(6,2) with cost 20
(7,2) with cost 44
(7,3) with cost 52
(7,4) with cost 54
(6,3) with cost 71
(5,3) with cost 74
(4,3) with cost 96
I wouldn't be having a problem if I could use a 2D Array but the assignment requires the use of a List and StringTokenizer.
The way it works, a file is read and each row of the grid is an element of the List of Strings. So in the example above if I were to call myList.get(1) it would return 35 57 41 13 82 80 71 93 31 62 since it's the second row and second index value of the List.
If it was a 2D array I would check values at [x-1][x-1],[x-1][x]... to check all sides and diagonals ect ect. But with the List and Tokenizer there isn't a way that I know of that can search through the String using index values.
I wouldn't even know where to start with that. As of now I read the file fine and make the List of Strings and populate it properly, I'm just a little stuck. I should also mention that which ever method I use to search needs to be recursive.
This is what little I have. It reads in the file, creates the list and assigns the rows to the list.
import java.util.*;
import java.io.*;
public class MaxIncreasingSub {
public static void main(String []args) throws Exception{
File file = new File("Ass1Q2_test1");
List<String> myList = new ArrayList<String>();
[Code] .....
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May 2, 2014
I have been working on this for hours and cannot get it to work properly. The program is to count the number of characters contained in both strings and display the results. It is also to display the final statement, but only once. This version has a complete statement for each matching character.
import java.util.Scanner;
public class CountMatches {
public static void main(String[] args) {
String firstStr = ("");
String s1 = firstStr;
[Code] ....
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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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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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Apr 28, 2014
I'm making an application that will allow users to view several displays simultaneously. I'm trying to make it so that the user should be able to select one of the items from a list then hit a radio button add them to the display. And there will be a second button to remove them from the display. Oh and there will always be alteast one display.
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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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Sep 11, 2014
I need to implement an editable JComboBox. It should display a list of rivers from a database. However since the number of rivers is very large, the entries must be dynamically filled after the user has typed in three or more letters.
I have tried to solve this using a KeyAdapter. Everythings works. However after the user has typed in three characters, these three characters are selected in the Combobox. Of course when the user continues to type these chars will be replaced. I have so far not found a solution to deselect the characters and place the cursor at the end.
this.fliessgewaesserComboBox = new JComboBox<UisFliessgewaesser>();
this.fliessgewaesserComboBox.setEditable(true);
this.add(this.fliessgewaesserComboBox, c);
FliessgewaesserSuchenKeyAdapter fliessgewaesserSuchenKeyAdapter = new FliessgewaesserSuchenKeyAdapter(this);
this.fliessgewaesserComboBox.getEditor().getEditorComponent().addKeyListener(fliessgewaesserSuchenKeyAdapter);
[Code] .....
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Aug 25, 2014
I am having an array of strings and i want to find out whether these strings contained in the array contain a similar character or not.For example i am having following strings in the array of string:
aadafbd
dsfgdfbvc
sdfgyub
fhjgbjhjd
my program should provide following result: 3 because i have 3 characters which are similar in all the strings of the array(f,b,d).
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Mar 26, 2014
I can sort strings in a collection by uppercase and then lowercase though I was wondering if there is any way of doing it in reverse, sorting by lowercase then by uppercase.
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Apr 15, 2015
Write a menu driven program that either accepts words and their meanings, or displays the list of words in lexicographical order (i.e. as in a dictionary). When an entry is to be added to the dictionary you must first enter the word as one string, and then enter the meaning as separate string. Another requirement - from time to time words become obsolete. When this happens, such word must be removed from the dictionary.
Use the JOptionPane class to enter the information.
Use the concept of linked list to carryout this exercise. You will need at minimum the following classes:
- A WordMeaning class that hold the name of a word and its meaning.
- A WordMeaningNode class that creates the node of information and its link field.
- A WordList class that creates and maintain a linked list of words and their meanings.
- A Dictionary class that test your classes.
For the output, the program should produce two scrollable lists:
- The current list of words and their meanings.
- The list of the deleted words. You need not list the meanings, just the words.
So far, I have everything coded except for the remove method, and I am not sure how to code that. I coded the add method already, but now I don't know where to begin with the remove method in my WordList class. My classes are below.
WordMeaning Class:
public class WordMeaning {
String name;
String definition;
WordMeaning(String t, String d) {
name = t;
definition = d;
[Code] .....
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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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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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Apr 22, 2015
I have a list of 100,000 + names and I need to append to that list another 100,000 names. Each name must be unique. Currently I iterate through the entire list to be sure the name does not exist. As you can imagine this is very slow. I am new to Java and I am maintaining a 15+ year old product. Is there a better way to check for an existing name?
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Dec 30, 2014
I receive a java.lang.NumberFormatException: For input string: ""DepDelayMinutes"" error when trying to filter a list and then assign the results to a new list.
I have edited the code so it is an int that throws the exception so it isn't the presence of a string that is causing the error - java.lang.NumberFormatException: For input string: ""0914"" .
I believe the issue is because of the two sets of double quotes but I do not understand how they came about. The original dataset does not have any quotes whatsoever.
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.function.Predicate;
import java.util.stream.Collectors;
public class FilterObjects extends Thread{
[Code]...
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Mar 18, 2014
Write a class named FileDisplay with the following methods:
1.) constructor: the class's constructor should take the name of a fil as an arugment.
2.) displayHead: This method should display only the first five lines of the file's contents
Here is the following code I have made so far
import java.io.*;
public class FileDisplay
{
private String filename;
public FileDisplay(String Filename) throws IOException
[Code] ....
First, in my constructor I have taken in an argument and used that argument to open up an output file. Meanwhile, I'm trying to work n the displayhead method to print out information and to read data to. I haven't opened up my input file yet, but I'm not understand how can I read a print data to an output file. in
public void displayHead()
{FileWriter file=new FileWriter(Filename)}
do I make create another instance of the filewriter class to output data?
In simple words, suppose to I want to display some messages on my output file in the displayhead function. Since I already have opened up the file in the constructor, how do I combine that in this method...
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Jul 5, 2014
Suppose i have given a List<Intervals> list; I am iterating over list and inserting each element from list into BST, if time require to insert into BST is logn then what is the total time require to insert all the elements into tree ?
logn or nlogn ?
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Oct 5, 2013
So we have an assignment regarding a linked list implementation of a given list interface.
In my list interface, the method contains(T anEntry) is defined.
In the LList implementation, contains is already implemented as part of getting the core methods in.
Now I am being tasked with the following:
Provide a second implementation of the method contains2(T anEntry) that calls a private recursive method
Private boolean contains (T anEntry, Node startNode) that returns whether the list that starts at startNode contains the entry anEntry.
I've written the private recursive method already. That's not an issue (at least not right now).
But what I don't understand is how startNode is supposed to be populated when this private contains method is called from the public contains2 method? contains2 only takes one parameter: anEntry. the private method takes two parameters: anEntry and startNode. How am i supposed to provide startNode when I am calling contains2?
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Feb 14, 2015
I saved the content of an ArrayList<SomeClass> to a file
I write each serialised object to the file by adding to each an id that is created with list.indexOf(object) (and saved before each object)
So I can repopulated the list with SomeClass objects in the same order as they were and once I reload the file, I do list.add(id,object)...
Well my list is populated upside down, I mean the first object is the last and the other way around, If i remove the id when I do the add(object)...
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Nov 19, 2014
I am developing a product where the client needs to display the content of XML in a JSP page. This XML will be extracted from database and will be temporarily sotred in a String object and will then be flushed to JSP page for display. This was working fine unitl now. But now the customer wants display each tag with one color. attribute in another color and data in another color.
For ex: <?xml version="1.0" encoding="UTF-8"?>
this should be displayed in one color. Then
<ichicsrmessageheader>Data</ichicsrmessageheader>
In the above one the tag should be displayed in one color and "Data" should be displayed in another color
<organisation operationtype="1">Data</organisation>
In the above sample tag should be in one color and attribute should be in one color ex: red and value of the attribute should be in another color ex: blue and "Data" should be in one color ex: green.
Here is the sample screen shot of how xml should is currently being displayed.
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Oct 6, 2014
I have this ListInterface class that has operations for my linked list and a LList class. The Llist and ListInterface classes are perfect. My job is to create a driver, or a demo class that showcases these operations. That being said, heres the driver so far:
import java.util.*;
public abstract class DriverWilson implements ListInterface
{
public static void main(String[] args)
{
LList a = new LList();
[code]....
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May 1, 2014
public void add(int d){
listNode l = new listNode (d, null);
l.next = first;
first= l;
}
public list Sum2List (list l1, list l2){
//variables
int sum;
[Code] .....
But I have a problem in my first listNode where it ll be pointing to null, thus in the sum2List method the program checks the while condition into false and doesn't go through the loop.
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Jan 7, 2015
I am creating a program called "Mad Math Machine". This program is to generate random arithmetic questions, with integers ranging from -12 to 12, for the user to answer. The user has three lives. Once they get more than three questions wrong, they run out of lives, and their "score" (the number of questions they answered correctly) is taken.
I have the large chunk of the program (the arithmetic questions and answers) completed. The only part I am stuck on is the scoring system. I believe that arrays would be useful for this task, but I have little idea of where to start. Here is what the scoring list should be able to do:
- It should print out the top ten recent players and their scores.
- A separate list should show the top-two highest scores of all time.
*I didn't think it was relevant, but I can include the program code. Up until this point, I have created methods to keep track of the score, but I have simply left them commented out so I could build the rest of the program.*
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Mar 13, 2014
Its supposed to notify the user if they have a palindrome, but keeps returning true even when I type, "hello".
import java.util.Scanner;
public class PalinDrome {
public static void main(String[] args) {
String line;
Scanner input = new Scanner(System.in);
System.out.print("Please enter a word ");
[code]....
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Feb 12, 2014
I know that in c++ in order to read a string like
PHP Code:
. you need to use
getline(cin,string variable)
. In java, I have noticed that using
String name=keyboard.nextLine()
automatically reads the whole line...Suppose I wanted to read the first name only, how would I be able to accomplish that?
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Jul 3, 2014
example input (#federer #great #game )->
output : [federer] [great][game], [federer, game],[federer,great], [game,great], [federer, game,great]
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