Java String.format
- by Stig Christian
I have an integer 100, how do I format it to look like 00000100 (always 8 digits long)?
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Java ArrayList initialization
- by Jonathan
I am aware that you can initialize an array during instantiation as follows: String[] names = new String[] {"Ryan", "Julie", "Bob"}; Is there a way to do the same thing with an ArrayList? Or must I add the contents individually with array.add()? Thanks, JonathanRead the article
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Static variables in Java for a test oObject creator
- by stevebot
Hey, I have something like the following TestObjectCreator{ private static Person person; private static Company company; static { person = new Person() person.setName("Joe"); company = new Company(); company.setName("Apple"); } public Person createTestPerson(){ return person; } public Person…Read the article
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Java moving 25 number single demension array to a 5x5 array
- by dalton
Assign the following 25 scores to a one dimensional int array called "temp" 34,24,78,65,45,100,90,97,56,89,78,98,74,90,98,24,45,76,89,54,12,20,22,55,66 Move the scores to a 2 dimensional int array called "scores" row wise -- meaning the first 5 scores go into row 0 etcRead the article
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Java Layout Insets
- by ikurtz
board image the above is a board layout done by using gridbaglayout. i would like insets of 5 pixels around the whole board but not between each label. i scaned the api and havent come up with something that lets me do this. does this mean i have to nest my board gui inside another gridbaglayout with the insets desired? thank you.Read the article
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Java Incompatible Types Boolean Int
- by ikurtz
i have the following class: public class NewGameContract { public boolean HomeNewGame = false; public boolean AwayNewGame = false; public boolean GameContract(){ if (HomeNewGame && AwayNewGame){ return true; } else { return false; } } } when i try to use it like so: if…Read the article
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best way to compare between two-dimension integer arrays in java
- by Edan
I would like to know what is the best, fastest and easiest way to compare between 2-dimension arrays of integer. the length of arrays is the same. (one of the array's is temporary array) thanks.Read the article
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How to effectively copy an array in java ?
- by Tony
The toArray method in ArrayList , Bloch uses both System.arraycopy and Arrays.copyOf to copy an array . public <T> T[] toArray(T[] a) { if (a.length < size) // Make a new array of a's runtime type, but my contents: return (T[]) Arrays.copyOf(elementData, size, a.getClass());…Read the article
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Java String.indexOf and empty Strings
- by tmeisenh
I'm curious why the String.indexOf is returning a 0 (instead of -1) when asking for the index of an empty string within a string. The Javadocs only say this method returns the index in this String of the specified string, -1 if the string isn't found. System.out.println("FOO".indexOf("")); // outputs…Read the article
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Implementing Java Priority Queue
- by Kay
public class PriorityQueue<T> { private PriorityNode<T> head, tail; private int numItems; public PriorityQueue(){ numItems = 0; head=null; tail=null; } public void add(int priority, T value){ PriorityNode<T> newNode = new…Read the article
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Java BufferedReader readline blocking?
- by tgguy
I want to make an HTTP request and then get the response as sketched here: URLConnection c = new URL("http://foo.com").openConnection(); c.setDoOutput(true); /* write an http request here using a new OutputStreamWriter(c.getOutputStream) */ BufferedReader reader = new BufferedReader(new…Read the article
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Java multiple connections downloading file
- by weulerjunior
Hello friends, I was wanting to add multiple connections in the code below to be able to download files faster. Could someone help me? Thanks in advance. public void run() { RandomAccessFile file = null; InputStream stream = null; try { // Open connection to URL. …Read the article
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Java Scanner won't follow file
- by Steve Renyolds
Trying to tail / parse some log files. Entries start with a date then can span many lines. This works, but does not ever see new entries to file. File inputFile = new File("C:/test.txt"); InputStream is = new FileInputStream(inputFile); InputStream bis = new BufferedInputStream(is);…Read the article
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How to get Java swing application to respect OS DPI settings
- by drasto
Is there a way to set DPI in swing ? For the whole application ? And if there is how do I set it to the value of system DPI ? I guess there must be a way to do it as I mentioned this feature must have benn added to NetBeans in some of latest versions... Thank you for readingRead the article
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Java how to calculate ervy week first day and last day
- by newbie123
I was trying to create a weekly calendar which look like this http://dhtmlx.com/docs/products/dhtmlxScheduler/sample_basic.html Any idea how to calculate every week date. example this week monday - sunday 7 june, 8 june, 9 june, 10 june, 11 june , 12 june, 13 juneRead the article
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is this possible in java or any other programming language
- by drake
public abstract class Master { public void printForAllMethodsInSubClass() { System.out.println ("Printing before subclass method executes"); } } public class Owner extends Master { public void printSomething () { System.out.println ("This printed from…Read the article
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Java 1.5.0_16 corrupted colours when saving jpg image
- by Coder
Hi, i have a loaded image from disk (stored as a BufferedImage), which i display correctly on a JPanel but when i try to re-save this image using the command below, the image is saved in a reddish hue. ImageIO.write(image, "jpg", fileName); Note! image is a BufferedImage and…Read the article
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Simple way to repeat a String in java
- by e5
I'm looking for a simple commons method or operator that allows me to repeat some String n times. I know I could write this using a for loop, but I wish to avoid for loops whenever necessary and a simple direct method should exist somewhere. String str = "abc"; String repeated…Read the article
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Make a text field highlighted when tabbed to in NetBeans (Java)
- by typoknig
Hi all, I'm trying to make it so when I tab to some text fields on in my JFrame the data in the text field will be highlighted. I thought I had done this in the properties before but I am not seeing the option now. Does anyone know how to do this?Read the article
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trace this java method
- by Bader
public static int ABC(int x, int y) { if(y==0) return(0); else return(x + ABC(x,y-1)); } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub System.out.println(ABC(5,3)); }Read the article
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W3C dom api in Java, get child elements by name
- by Benju
I just realized that the method Element.getElementsByTagName("someTagName") returns a nodelist of all elements in the document that have a given tagname. What if I just want to get all child elements by tag name? For example... <person> <name>Bob</name>…Read the article
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Add elements to Arraylist and it replaces all previous elements in Java
- by pie154
I am adding elements to a ArrayList and it adds the first one correctly but then when I add any subsequent elements it wipes replaces the other elements with the value form the most recently added and adds a new element to the ArrayList. I ran test using arraylist and ints…Read the article
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debugging scaffolding contingent upon degbugging boolean (java)
- by David
Recently i've found myself writing a lot of methods with what i can only think to call debugging scaffolding. Here's an example: public static void printArray (String[] array, boolean bug) { for (int i = 0; i<array.lenght; i++) { if (bug)…Read the article
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Java webapp: where/how to automatically set each picture's width/height
- by NoozNooz42
For several reasons, a lot of "webmaster guides" (like Google and Yahoo!'s webmaster guides/guidelines) repeats several times that it is better to always put the width and height attribute of the img tag. One of the most obvious reason is that the elements in…Read the article
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java library for reading RSS and ATOM feeds
- by Samuel
I am looking for libraries which can read RSS / ATOM feeds in my J2EE application (based on JBoss Seam). Is Rome the only application there for reading feeds? I am assuming the Seam RSS integration is only for generating RSS feeds and not for reading feeds.Read the article
