Java Iterate Over Collection Not Working As Expected
Aug 6, 2014
I am currently working on a Java project, below are my attempts at coding so far:
public class MyZoo
{
// zoo identifier
private String zooId;
// a number used in generating a unique identifier for the next animal to be added to the zoo
private int nextAnimalIdNumber;
// zstorage for the Animal objects
private TreeMap<String, Animal> animals;
[Code] ....
I currently cannot get the printAllAnimals() method to work as it should.
When executing the method printAllAnimals(), it does not do anything, when it is supposed to use the Collection object c, so that animals stored in the zoo can easily be checked.
the problem which im facing when executing jar file is it is not working same as when i run file using the IDE.When run jar file, it won't open the new frame even the user and pass combination correct.But when i'm compiling using the IDE, it works as charm. The main menu popped up after i logged in.I've tried Clean and Build and it's not working too.
I am trying to get a scrollPane working correctly, but not having any luck. The picture drawn in the center panel is quite large and goes off the screen. I visited URL... but I am missing something vital. Both tracks show, but there is no knob to do the scrolling.
public DViewer() { super(); frame = new JFrame(); frame.setSize(Toolkit.getDefaultToolkit().getScreenSize()); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
17/03/2015 09:38:39 AM 17/03/2015 10:52:26 AM 10/03/2015 08:30:56 AM 02/03/2015 09:18:10 AM 02/03/2015 09:37:23 AM 02/03/2015 11:25:01 AM 02/03/2015 11:29:00 AM 02/03/2015 11:42:38 AM 02/03/2015 12:04:39 PM 02/03/2015 12:09:05 PM 02/03/2015 01:17:09 PM 02/03/2015 01:29:08 PM
I want them to sort them as per below result: (Same date one should be sort by timestamp)
17/03/2015 10:52:26 AM 17/03/2015 09:38:39 AM 10/03/2015 08:30:56 AM 02/03/2015 01:29:08 PM 02/03/2015 01:17:09 PM 02/03/2015 12:09:05 PM 02/03/2015 12:04:39 PM 02/03/2015 11:42:38 AM 02/03/2015 11:29:00 AM 02/03/2015 11:25:01 AM 02/03/2015 09:37:23 AM 02/03/2015 09:18:10 AM
I tried using Collection.sort using compareTo but result is not expected...
I am looking at a snippet of code in my "learning Java 4th edition" by Orielly and there is a small snipped of code which says:
Java Code: Date date = new Date(); List list = new ArrayList(); list.add( date ); ..
Date firstElement = (Date)list.get(0); // Is the cast correct? Maybe. mh_sh_highlight_all('java'); so I am typing the same thing in my compiler in a small Driver class and for some reason I have an error and Im dumbfounded...
17/03/2015 09:38:39 AM 17/03/2015 10:52:26 AM 10/03/2015 08:30:56 AM 02/03/2015 09:18:10 AM 02/03/2015 09:37:23 AM 02/03/2015 11:25:01 AM 02/03/2015 11:29:00 AM 02/03/2015 11:42:38 AM 02/03/2015 12:04:39 PM 02/03/2015 12:09:05 PM 02/03/2015 01:17:09 PM 02/03/2015 01:29:08 PM
I want them to sort them as per below result: (Same date one should be sort by timestamp)
17/03/2015 10:52:26 AM 17/03/2015 09:38:39 AM 10/03/2015 08:30:56 AM 02/03/2015 01:29:08 PM 02/03/2015 01:17:09 PM 02/03/2015 12:09:05 PM 02/03/2015 12:04:39 PM 02/03/2015 11:42:38 AM 02/03/2015 11:29:00 AM 02/03/2015 11:25:01 AM 02/03/2015 09:37:23 AM 02/03/2015 09:18:10 AM
I tried using Collection.sort using compareTo but result is not expected.
I've got a CDI bean which is a facade for a JPA entity. Such entity has got a many to one relationship with itself and I've got the following method:
public Set<Account> getChildren() { return this.children; }
which is called in a JSF/Facelets page:
<h:commandLink action="#{accountController.destroy}" value="#{bundle.ListAccountDestroyLink}" rendered="#{item.children.size() == 0}"/>I then decided to return an unmodifiable set and changed getChildren() accordingly: public Set<Account> getChildren() { return Collections.unmodifiableSet(children); }
The page now reports this error:
java.lang.IllegalAccessException: Class javax.el.BeanELResolver can not access a member of class java.util.Collections$UnmodifiableCollection with modifiers "public" at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65) at java.lang.reflect.Method.invoke(Method.java:588)
[Code] ....
javax.el.BeanELResolver is incorrectly failing because it's trying to invoke the size() method using reflection without correctly taking into account the method visibility (which is indeed invokable programmatically). I'm running NetBeans 6.8, Glassfish 3.0 and jdk1.6.0_17.
I need to retrieve all Line Strings from a Geometrical Collection(of line strings) lying between two coordinates (Coordinates are taken from existing Line Strings in the Geometrical Collection).
I am using JTS library. I tried intersection() function but it worked only for linear geometries not for curved. How to get the output in the most efficient way.
I would like to know how I can iterate through objects . I have a manually created linked list (without using the built-in method one). So in the memory my object looks like this(attachment).I would like to do a for loop or while loop to get each element under the test3.head.
When do you get the error <identifier> expected? I've written a small application where input is accepted by a textfield and based on some condition a dialog should be displayed saying "invalid i/p". But am not able to correct ths particular error ....
I have used unmarshalling concept to retrieve the data elements... I have to check whether the elements satisfy few regulations when compared with data in Database. So, i thought of grouping the employees depending on EType. I have created a Map with linkedlist of employees. Say Map<String, LinkedList<Employe>>EmpMap=new Map<String, LinkedList<Employe>>();
I have already created a class named Employee which has all the setter and getter methods for employee.
Here am going to take Etype(Employee type) as key and linkedlist(list of employees of certain type) as value. How to iterate these linked lists and place them in my Map.
I facing issue with nested <c:forEach in my jsp page.I am using jstl.jar..Here is my code
in JAVA I have --> List<ProductDefViewBean> productList = new ArrayList<ProductDefViewBean>(); productList.add(objProductDefViewBean); request.setAttribute("ProductList", productList); <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
[code]...
javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in <forEach>
Requirements - Use only standard Java API and no apache file utils for this.
Most of the answers I found on the internet either dont meet this requirement or load all file names into an array which can consume too much memory when no. of files = 20,000+. how I can do this. Is there also a way to keep track of new files that were added during the execution of the loop in this code ?
I have done this before in C++ but now I want to do it in Java. I am not sure how to iterate through a ArrayList, I have look several places because lets be honest the first stop is normally google. I tried the examples but with no luck.
package org.search.BFS; import java.util.Queue; public class BFS extends Graph { private Queue<Integer> q; BFS(int s) { //mark all the vertices as not visited.
Also the below is giving me a Type safety: The expression of type ArrayList[] needs unchecked conversation to conform to ArrayList<Integer>[]
I have a JSP code which will open the contents of a excel file.
Now i need this contents of the excel file to be added dynamically to a table in the sameJSP. How to proceed.At the maximum 10 rows can be added dynamically.
Assuming i have a table in JSP which has heading first name,last name,DOB and Gender. After opening the excel through JSP the contents needs to be iterated and added to the columns mentioned.
Is there anyway to iterate an enum type without an instance. As some context, consider the following code:
Java Code: public interface GenericChecker { public bool isValid(String str); } mh_sh_highlight_all('java'); Java Code: public class EnumChecker<T extends Enum<T> > extends GenericChecker { private Class<T> enumType; //No instance
[code]....
toString method of the enum types has been overridden so that it returns the name assigned to the enum rather than the enum name itself. For example an enum might be SOME_ENUM("Assigned name"), therefore toString returns "Assigned name" rather than "SOME_ENUM". The idea is that a field from a table can be handed to the isValid(String) function on the GenericChecker base, and the derived class will then check to see if the field matches valid data as far as it is concerned.Thus, I can create a whole bunch of checkers easliy:
I have an 46x9 array. I only have 108 values in the array for which I need to perform preliminary computations. How do I get the read to only read the 108 values whose values are greater than 0 and skip the other 495 whose values are 0?
I am learning iterating through lists. What I have so far is two Hash Sets and two Tree sets. Hash Set 1 and Tree set 1 include the words from Roughing it by Mark Twain. Hash set 2 and tree set 2 include the words from Adventures of Huckleberry Finn by Mark Twain. (Everything is read from a file I made).
I am stuck trying to find out how to "Iterate through the words in HashSet1 and search for these words in both TreeSet2 and in HashSet2".Here is my code:
public class UsingSets { public static void main(String[] args) throws FileNotFoundException { String riHashIterator = null; HashSet<String> riHash = new HashSet<>(); Scanner input = new Scanner(new File("roughingit.txt")); while(input.hasNext()){ String riHashWords = input.next(); riHashWords = riHashWords.toLowerCase(); riHash.add(riHashWords);
my getDisplayValue() method. I am trying to iterate though an Array to display a value in a calculator, but I doesn't work. I keep on getting these weird magical numbers at the end of the iteration. Note that this is done in BlueJ.
Calculator -> UserInterface -> CalcEngine and Calculator -> CalcEngine. public class CalcEngine { //Instance variables used. //These are all the instance variables I used to implement //a complete calculator solution.
I created a superclass Ships and under that a class CivilShips. Under that HumanBulkFreighter.
I declared variables in Ships and CivilShips and wanted to have them set in HBF to a specific value. When I know try to compile them I get the following:
