sciprog1

Hello Members, I want to write a C program which creates two threads and uses a semaphore (as a critical section) to sleep for 1 second and then terminate. I am having a hard time with some of the C Syntax for semaphores. Is it possible to post an example …

Hello Members, I am looking into using Java to be able to model/simulate (MODSIM) discrete and continuous systems in the areas of traffic modeling, birth/death process, spread of disease etc. I have a working knowledge of Java. I have a good grasp of calculus and differential equations. I am looking …

Hello, I have a JPanel (inside of a JFrame). I have a picture(.jpg), a JTextArea (with scroller) and a JTextField. On the JPanel, I want the picture left justified , the JTextArea right justified and the JTextField just below the JTextArea. What kind of layout would be appropriate? Thank you! …

Hello Members, Given an undirected Graph, G, is there any standard algorithm to find the value of k, where (k-1) represents the number of vertices whose removal results in a graph that is still connected and the removal of the kth vertex makes the graph disconnected? Thank you! sciprog1

Hello Members, Is there any Permutation API in Java? I found the following: [url]http://www.jsc.nildram.co.uk/api/jsc/combinatorics/Permutations.html[/url] I am unable to figure out what should be the import statement for the above API. I would be grateful for any help. Thank you! sciprog1

I am testing a program in C++ Templates (from the Deitel Textook) and I have the typical three files: Array.h: [CODE]// Exercise 14.7 Solution: Array.h // Class template Array definition. #ifndef ARRAY1_H #define ARRAY1_H #include <iostream> using namespace std; template < typename elementType, int numberOfElements > class Array { public: …

Hello Members, I am beginning to work with the JGrapht library. The following is described as the syntax for creating a weighted, directed graph: [CODE]SimpleDirectedWeightedGraph<String, DefaultWeightedEdge> graph = new SimpleDirectedWeightedGraph<String, DefaultWeightedEdge>(DefaultWeightedEdge.class); [/CODE] What is the meaning of including " DefaultWeightedEdge.class" in the above line? I will be grateful for any …

Hello Members, The following code compiles and runs accurately, but gives the following message: [CODE]Note: List.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details.[/CODE] [CODE]import java.util.*; public class List { private final static int[] array = {1,2,3,4,5,6,7,8,9,10,11,12,56}; public static void main(String args []) { ArrayList x = …

Hello Members, How do you color a range of cells in a WritableWorkBook (in Jxl)? Thank you!

Hello Members, I am trying to add weights to a Graph that is implemented using JGrapht. I keep getting a NullPointerException, which I am unable to understand as all other edges seems to be added fine. I would be grateful for any help. The code so far: [CODE]import org.jgrapht.*; import …

Hello Members, Can anyone recommend any easy-to-use and free JavaScript IDEs? Thank you!! sciprog1

Hello Members, I have a program with a lot of MouseListeners. The issue I am having is the program is ending even before I click. I tried using sleep and flags to pause the program without much success. Just wondering if there is way to get the program to pause, …

Hello, The following custom class has compiler errors where it is not recognizing KeyListener. Any idea on why I am getting this error? [CODE]import java.util.concurrent.*; import java.util.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class worker1 extends Thread { private SynchronousQueue<Object> q; private int i; public worker1(SynchronousQueue<Object> q) { super("Worker …

Hello Members, I am trying to solve the following problem using threads: Thread_1 outputs values from 1 to 1000. Thread_1 waits. Thread_2 outputs values from 1 to 1000. Thread_2 now waits. Thread_1 outputs values from 1000 to 2000. Thread_1 is done. Thread_2 outputs values from 1000 to 2000. Thread_1 exits …

Hello, I have a JFrame, inside which is a JPanel, in which I am drawing lines in the paintComponent() function at an interval of 1 second. The screen always freezes. How can I change the program below such that I can see the lines being drawn after every second? Thank …

Hello Members, Can anyone point me to a web link which has the java code for a simple game that uses the keyword synchronized and the thread synchronization functions, wait() and notify()? Thank you!

Hello, The following program has a JButton and a JLabel in a JFrame. I am using Flow Layout. How do I get the JLabel to show directly below the JButton before clicking the JButton and after clicking the JButton? Thank you! [CODE]import java.awt.event.*; import javax.swing.*; import java.awt.*; public class checks …

Hello, I have a program where if I click anywhere in a JFrame, a ball appears(using fillOval).If I happen to click on the ball once it has appeared, how do I make it disappear? Thank you!

Hello, I have a 800 x 800 board where I post several pictures by using the Image class and the drawImage() method. Each image is 100 x 100 in size. If I click at any location of this board, I can easily identify the top left coordinates(x,y) and the length …

Hello Members, I have a Class_A which extends a JPanel. This JPanel is inside of a JFrame. In Class_A, I have a series of images (stored in an ImageIcon array) and another image, let's call it Image_A, which is also a ImageIcon type. How do I make Image_A a background …

Hello Members, Is there a way to make a JDialog unmovable? Thank you!

Hello, On the UNIX system that I am current working, to open a file in the pico editor ,I need to do the following: [CODE]>./pico filename.c [/CODE] Is there a script/command that I can execute which will remove the dot/slash and change that to: [CODE]> pico filename.c [/CODE] Thank you!

Hello Members, I have the following question about the pipe() system call. Say, Process A (my main()) forks a Process B which then forks a Process C. How can I open a pipe between Process C and Process A? I would like to write a sentence in Process C and …

Hello Members, I am trying to understand the pipe() system call. I found this program online: [CODE] #include <unistd.h> #include <stdio.h> #define MSGSIZE 16 char msg1[] = "hello #1"; char msg2[] = "hello #2"; char msg3[] = "hello #3"; main() { char inbuf[MSGSIZE]; int p[2], j; /* open pipe */ …

Hello Members, The wait() system call is illustrated to be used as follows: [CODE] int status, pid; /*fork a child process*/ /*parent is waiting for the child to terminate*/ pid = wait(*status) [/CODE] What exactly does the pointer to the "status" variable do when "status" has not even been assigned …

Hello, How do I send a class (that extends from JFrame) back and forth between Client and Server? I would grateful for any pseudocode. Thank you!

Hello, I have a Client/Server program. The Server is BlackJackServer.java. I am having the following exception when I run the program. Can anyone explain me what the error below is saying? [CODE]java.net.SocketException: Software caused connection abort: socket write error at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92) at java.net.SocketOutputStream.write(SocketOutputStream.java:136) at java.io.DataOutputStream.write(DataOutputStream.java:90) at java.io.DataOutputStream.writeUTF(DataOutputStream.java:384) …

Hello Members, The following problem has troubled me for sometime now: I have an applet called FileA.java. It has two classes both of which are JPanels. Both these JPanels are then added to the applet in the public class of FileA.java. I use BlueJ. The program works well offline on …

Hello Members, The following Client/Server does a simple chat where I am able to send and receive one line at a time. How should I proceed if I were to send at aleast 4-5 lines at a time. Any help (with some sample pseudocode) would be of immense help. Thank …

Hello Members, How do I change the code below sothat I can have the JLabel at the center of the JFrame and the two JButtons directly below the JLabel? Thank you! [CODE]import java.awt.*; import javax.swing.*; public class Layout { public static void main (String args[]) { JFrame m = new …

Hello Members, I have a simple Client/Server program which does the following: Server sends an array of Images one at a time to the Client. Client displays them one at a time. My Server: [CODE]import java.net.*; import java.io.*; import javax.swing.*; public class Server { public static void main(String[] args) throws …

Hello Members, Can anyone recommend any easy-to-use and free Java Script IDEs? Thank you!! sciprog1

Hello Members, I have three balls(all JPanels) bouncing in a JFrame. Following are the files: BouncingBalls.java: [CODE]import javax.swing.*; import java.awt.*; class BouncingBalls extends JFrame { public BouncingBalls() { setResizable(false); setSize(400,400); Ball ball1 = new Ball(); Ball ball2 = new Ball(); Ball ball3 = new Ball(); ball1.add(ball2); ball2.add(ball3); getContentPane().add(ball1); setVisible(true); Thread …

Hello, I have a project in BlueJ, called Game. Inside this project, I have the following files: File_A - A JApplet file which creates instances of Class_A and Class_B and calls their respective member functions. File_B - Implements Class_A (a JPanel) File_C - Implements Class_B( a JPanel) In order to …

Hello Members, The following Client.java and Server.java works fine: Client.java [CODE]import java.net.*; import java.io.*; public class client { public static void main (String args[]) throws IOException { Socket sock = new Socket(InetAddress.getLocalHost (), 2000); BufferedWriter dataout; String Message = "How are you?"; BufferedReader datain; System.out.println ("Sending "+ Message + " …

Hello Members, I have a JTextArea object containing a paragraph. Is it possible to bold certain words in it? A pesudocode or example code would be of great help. Thank you!! sciprog1

Hello Members, Is there a way to remove the border lines of a JTextArea but retaining the JScroller? I tried the setBorder(null) method for the JTextArea without any success. Thanks a lot!! sciprog1

Hello Members, Is it possible to have a Scrollbar for a JOptionPane as described below? [CODE]public class Hello { public static void main (String args []) { JOptionPane.showMessageDialog (".............."); } }[/CODE] If you can show me some pseudocode or a sample program, I would be very grateful. Thank you!! sciprog1

Hello Members, What is the largest integer that can be stored in Java? Thank you!!

Hello Members, Does BlueJ support Networking? Can you have the main() of Client.java and Server.java running at same time? I always get this "Your program is running.You cannot start another execution......". Any help would be greatly appreciated. Thank you!! sciprog1

Hello Members, I have two classes(A and B) which extend from a JPanel. These two JPanels are then added to a JFrame in a third class. I would like the program to be such that when I click a certain button in A, A becomes invisible and B becomes visible …

Hello Members, I have an Applet which calls a JFrame. Once the JFrame shows up, is there a way to make the Applet invisible? Thank you!! sciprog1

Hello Members, I have a JFrame, which creates a JDialog upon clicking. In the JDialog, I have a JCombobox. When I choose one of the options in the JCombobox, I should be able to change the background color of the JFrame randomly in an open ended loop. When I then …

Hello Members, Is it possible to write a Client/Server program between two PCs in a LAN? If yes, besides the IP address of the two PCs, what other information would I need? Thank you!!

Hello Members, If possible, kindly let me know why I am not able to see the text in the buttons("Button" and "Button two!") when I run this Java program: [CODE]import java.awt.*; import javax.swing.*; public class Sample extends JFrame { private JButton b1, b2; private final Container container; public Sample() { …

Hello Members, My program consists of a JFrame, which opens a JDialog. At this point, the modal is "true" for the JFrame when the JDialog is opened. What I want is the following: Once the interaction with the JDialog is complete, the modal for the JFrame should be turned off …

Hello Members, I am trying to multiply two matrices using multithreading. I get a NullPointerException on the line that is commented in Bold. Following is the entire code. Any input is much appreciated. [CODE]import java.lang.*; import java.io.*; public class Matrix_Mult extends Thread { static int a[][]; static int b[][]; static …

Hello Members, I have a java file (myapplet.java), the myapplet.class file and the myapplet.html file. I would like to run this applet on my webpage. I use IE 7.0 The myapplet.html and myapplet.class files are both in the public_html folder of my UNIX account,which happens to be on the school …