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math and computer science teacher.
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27 Posted Topics
 | I am trying to understand the structure of .class file in Java. Wrote a very simple program : package javautilities; public class Class_File_Structure { public static void main(String[] args) { int a = 10; int b = 20; int c = a + b; } } used the command javap … |
| | /* PointOne type objects has three members. Two of type Integer and one of type ThreeD a custom class. PointOneClone method takes an argument of PointOne type and copy every value from his members to arguments members. So the result is a PointOne instance with the exact same values but …  |
| | Testing the following code from a book public class RunTime { public static void main(String[] args) { Runtime r = Runtime.getRuntime(); //MEMORY MANAGEMENT long mem1, mem2; Integer intmatrix[] = new Integer[1000]; System.out.println("Total memory is :" + r.totalMemory()); mem1 = r.freeMemory(); System.out.println("Initial free memory is :" + mem1); r.gc(); mem1 = … |
| | ProducerConsumer_Using_ExecutorService class in a for loop initiate producer consumer threads using worker threads from ExecutorServiceThreadPool class. consumer thread takes an element from queue adding it to ArrayList consumerdata. Seems that consumerdata has no elements. why is that; Both producer - consumer threads seem to work. import java.util.ArrayList; import java.util.Iterator; public … |
| | In the following example two threads share int counter. The increment_thread thread increases counter by one . The decrement_thread thread decreases counter by one . I use semaphore to control access to counter instead of making the two methods synchronized. Is this the proper way of using semaphore? When should … |
 | This is something similar i had wrote. I hope it will help you. public class Change{ private boolean flag = false; public static int commonresource=1; public synchronized void increment(int inc) { while (flag){ try{ wait(); } catch (InterruptedException e) {} } flag = true; { System.out.println("before increment :"+commonresource); commonresource += …  |
| | One thread increases an integer named "counter" , and another decreases the same integer. Using synchronized statement on LockObject to control access to counter. If i understand correctly i have to use an Object reference. Can i use synchronized statement on counter somehow? public class Synchronized_Block_Demo { public static int … |
 | Go to services. Right click on your database and choose connect. |
| | Why do you ask since you have already used createMenuBar()? read this. http://docs.oracle.com/javase/tutorial/uiswing/components/toolbar.html Why do you want to make your gui using functions that return components. Can't think of any reason. |
| | You are refering to methods and not classes. Pass it as a parameter in the method you want to use . |
| | Perhaps you should use BufferedReader. try (BufferedReader reader = Files.newBufferedReader(sourceFile, charset)) { String line = null; while ((line = reader.readLine()) != null) { System.out.println(line); } } catch (IOException x) { System.err.format("IOException: %s%n", x); } |
| | Using NetBeans 7.3.1 i have created a JFrame. A JLabel fills the bottom of the JFrame . The JLabel displays an ImageIcon. I want the ImageIcon automatically resize itself when JLabel resizes. Generated Code from IDE : jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); jLabel1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Number_theory/resources/primes_ulam_spiral.gif"))); // NOI18N jLabel1.setDoubleBuffered(true); jLabel1.setOpaque(true); jLabel1.addComponentListener(new java.awt.event.ComponentAdapter() { public void componentResized(java.awt.event.ComponentEvent … |
 | I tried to maintain your structure. This works. You have to make it continue if a game is over. package GridBagLayout; import java.awt.Color; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import java.util.Random; import javax.swing.JOptionPane; public class DisplayButtonMessage { //display action command of jbutton int matches=0; … |
| | I am making a project in Number Theory and i want to display some formatting text in a textArea in my Gui. I have a method named padding which takes an integer as an argument and return a String consisitng of a number of spaces. This number is 12 - … |
| | I want to list all files and directories from a start point using recursion. Here is my code. import java.io.File; import java.io.IOException; public class RecursiveWalk { void recursive (File[] allfiles) throws IOException{ for (File file : allfiles) { if (file.isDirectory()) { System.out.print("directory:"); System.out.println(file.getCanonicalPath()); recursive (file.listFiles()); } else { System.out.print(" file:"); … |
| | In a previous thread i had described a problem i had to transfer a frame or panel and all it's components as an image into a buffered image. I thought i had found the solution but it seems i am doing something wrong. In line 162 i call the method … |
| | I want to write a version of the SAND GAME. I want to examine the color of every pixel in a Jframe window. I use something like this. Toolkit toolkit = Toolkit.getDefaultToolkit (); Dimension dim = toolkit.getScreenSize(); int height = dim.height; int width = dim.width; GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice … |
| | package mypackage; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; public class datedifference { public static void main(String[] args) throws ParseException { Date userdate = new SimpleDateFormat("dd/MM/yyyy").parse("21/06/2011"); Date today = new SimpleDateFormat("dd/MM/yyyy").parse("21/06/2012"); Calendar gc1 = new GregorianCalendar(); gc1.setTime(today); Calendar gc2 = new GregorianCalendar(); gc2.setTime(userdate); long daysdiff = (gc1.getTimeInMillis() … |
| | Here is some code i wrote many years ago. Retrieving data from an access database and display them using a JTable (my suggestion) Maybe you will find something useful. package askhsh3; /** * * @author nikos */ import javax.swing.table.*; import java.awt.Component; import java.awt.Color; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.JTable; import javax.swing.JFrame; import … |
| | How can i add some space between these four components and the JFrame window?  |
| | After login (if succeed) a user will see the result of statement "select test_column from table_test " execution. table_test is the only table of database 'test' which i have created in NetBeans 7.0.1. test_column is the only column. class '[B]MySQLTest[/B]' creates the gui for login , connects with the database … |
| | FROM Cisco Systems, Inc. Catalyst 2950 Desktop Switch Software Configuration Guide, 12.1(9)EA1 [URL="http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_9_ea1/configuration/guide/swmstp.html#wp1031378"]http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_9_ea1/configuration/guide/swmstp.html#wp1031378[/URL] [B]Synchronization of Port Roles[/B] When the switch receives a proposal message on one of its ports and that port is selected as the new root port, the RSTP forces all other ports to synchronize with the new … |
| | I have a public class change which holds the private static int [B]commonresource[/B] and the methods : public synchronized void [B]increment[/B](int inc) public synchronized void [B]decrement[/B](int inc) to handle the variable commonresource I have a main class which starts 2 new threads "nikos" , "fosses" with a constructor that takes … |
| | If you remove everything that is not between < > then you will be left with something like this. <html><head><title></title></head><body><p></P> </body></html>. this is a string. suppose s is a string. s = <html> hold its position (1)and length(6) if you find another tag eg <head> then s = <head> and … |
| | This is a poor implementation of quicksort in pascal. I will use it in the classroom for a demonstration in sorting algorithms (divide and conquer). I would appreciate if someone could help me a little with some improvements. [code=pascal] program quicksort; uses wincrt; const max = 10; type table = … |
| | i am trying to make an autorun cd with a digital book in java. 1) How can i find out the cd or dvd drive letter in which has entered my cd? in the code section below i use this very ugly way to achieve this. 2)which is the best …  |
| | i have the following struct [code] typedef char * typos_stoixeiou; typedef int metritis; typedef struct korifi *kdiktis ; struct korifi { typos_stoixeiou dedomena; metritis counter; int kleidi; int arithmospaidiwn ; korifi *a[100]; }; [/code] if i try this [code] for(int s=0;s<size;s++) { root->a[s] = (kdiktis)malloc(sizeof(struct korifi)); root->a[s] = NULL; }[/code] …  |
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