java

Interaction between Java App and Python App

Hi, I have a python application which I cant edit its a black box from my point of view. The python application knows how to process text and return processed text. I have another application written in Java which knows how to collect non processed texts. Current state, the python app works in batch mode every x minutes. I want to make...

Make private methods final?

Is it beneficial to make private methods final? Would that improve performance? I think "private final" doesn't make much sense, because a private method cannot be overridden. So the method lookup should be efficient as when using final. And would it be better to make a private helper method static (when possible)? What's best to use?...

How to write data to a file through java?

I want to make a GUI application that contains three functions as follows: Add a record Edit a record Delete a record A record contains two fields - Name and Profession There are two restrictions for the application You can't use database to store info. You have to use a flat file. Total file should not be re-written for every add...

class file to java file conversion

Hi, How to get java file i.e source code from class file i.e from compiled file? ...

Hibernate Vs iBATIS

For our new product re-engineering, we are in the process of selecting the best framework from Java. As the consideration is to go for database agnostic approach for model, we are working on options between Struts + Spring with iBATIS or Hibernate. Please advice which is best as both offer persistence. ...

Java licensing model : When do I need to pay Sun for using their software?

Java licensing model : When do I need to pay Sun for using their software? ...

how send back a child in java?

I added a TextPane in jForm. The form has a menu bar but the menus are displayed on the back of the TextPane. How can i fix it? ...

How to delete a data from a file through java?

I want to read a file in java. And then, I want to delete a line from that file without the file being re-written. How can I do this? Someone suggested me to read/write to a file without the file being re-written with the help of RandomAccessFile. http://stackoverflow.com/questions/1984534/how-to-write-data-to-a-file-through-java Spec...

Finding the largest positive int in an array by recursion

I decided to implement a very simple program recursively, to see how well Java handles recursion*, and came up a bit short. This is what I ended up writing: public class largestInIntArray { public static void main(String[] args) { // These three lines just set up an array of ints: int[] ints = new int[100]; java.util.Ran...

Where is Java used the most?

I have no experience with Java, but I understand it's one of the most used languages. What areas use Java the most? What are real world applications using Java as a solutions platform? Related: Why do people use Java? ...

Java Runtime Performance Vs Native C / C++ Code?

I've become more and more comfortable programming in Java than with C++ or C. I am hoping to get a sense of the performance hit incurred using a JVM interpreter, as opposed to executing the same "project" natively. I realize that there is some level of subjectivity here; the quality of the program will depend highly on a good implement...

help in synchronized method in java

Hi everyone... I've write a program with java that simulate production water with synchronization (Oxygen wait for Hydrogen to become available), but it's gives "Unexpected Operation Exeption" and did'nt work... Please help me... there are my codes: // class for thread Oxygen public class Thread_O implements Runnable { Object object;...

Is it necessary to learn all APIs?

Hi, I want to learn Java EE but I don't know where to start. Someone told me that it is better to start with APIs. Please help. ...

Deleting and replacing selected text in JEditorPane

I am trying to make a Text Editor using Java Swing. In that I am using JEditorPane instead of JTextArea. I am facing problems in deleting selected text and replacing selected text from the JEditorPane. The Code I am Using is: public void delete(JEditorPane txt) { int start = txt.getSelectionStart(); int end = txt.getSelectionEn...

String javax.xml.xpath.XPathExpression.evaluate(Object item) guarantees it never returns null in all implementations?

From the JavaDoc: returns: The String that is the result of evaluating the expression and converting the result to a String. /** * ... * ... * @return The <code>String</code> that is the result of evaluating the expression and converting the result to a * <code>String</code>. * ... * ... */ String javax.xml.xpath.XPathExpressi...

Path stack in a Java recursive search

Hi! I wrote a simple Depth-First search algorithm, which works, but is failing to build the patch right. Im having a tough time trying to understand, why - so, basically, need your help, guys :) Here is the code: public void Search(String from, String to) { String depart = from; String destin = to; if ( (NoChildren(depart) == fa...

Are all J2SE classes available in J2ME ?

Hi, I'm a java noob. Wanted to know if all J2SE classes are available in J2ME. If not why is it so? Thanks ...

How to implement Dicom attribute dictionary in my own API

Greetings, I am currently trying to learn some Java programming. To do this I'm trying to make something actually useful. Because I'm studying Medical Imaging, I though I would write my own Dicom Api in Java. Part of the Dicom Standard is a Data Dictionary containing attributes used in Dicom Files. These attributes have to following pr...

Open eclipse svn project in netbeans

Hey SO OK my problem is quite simple Im about to start working with a team of programmers, and we are using a svn repository to store our code, thy files are set up as Eclipse Project as the rest of my team all like eclipse. However I am die hard netbeans man, I have tried eclipse Iv given it some time but we do not gel as they say. ...

Why does the profiler show large numbers of char[] instances when I am not creating any?

I am running a NetBeans profile of a recursive operation that includes creating a class with a java.lang.String field. In the classes list, in the profile heap dump, the number of String fields corresponds to the number of classes created as expected, however there are also a similar number of char[] instances. The char arrays account fo...