I want to search for files using wildcards. After a lot of googling I found [URL] ..... I downloaded the .java files and put them in the same directory as my own java file. but now I don't know, how to include this java file.
View RepliesI am currently building a Plugin system for an application and I wanted to add a little security feature.
I have read many tutorials on this and they basically all came down to the same answer:
"Its complicated: You need a custom class loader and security manager and ... and even then its still tricky"
So I thought, before I load the classes dynamically I will simply read the class files. Why bother with a SecurityManager or ClassLoader if I can simply whitelist all allowed classes and search for all illegal Class access before I even load anything.
I have a mysql database and I want to be able to search through a table for a key word in a column like:
words
my fat cat
the yellow canary
what blue cow
and if i put in the full string like "what blue cow" if finds a match, but I want to be able to put in "blue" and see if it finds a match
Java Code:
String keyword = t3.getText();
String sql1;
sql1= "SELECT * FROM table WHERE words ='"+keyword+"'";
rs = stmt.executeQuery(sql1);
while(rs.next()){
JOptionPane.showMessageDialog(null, "found match");
} mh_sh_highlight_all('java');
Im not sure how to do this using wild cards with user input (a JTextfield)
So I am trying to write the output of two different java class files to one txt file while the program runs. The file name is determined before the program is ran, through the command prompt as arguments. How can I get the second class file to edit the same txt file without running into compile errors.
For right now I'm just going to send everything that the second file outputs to a message String variable, so that the Main class outputs to the the text file. I still want to learn how to write to the same text file directly from the second class file.
import java.io.*;
public class Test{
public static void main(String[] args) throws IOException{
int x;
//create a new file internally called doc. But externally labelled the user input
File doc = new File(args[0]);
if (doc.exists()){
[Code] .....
What step to know to develop software..
View Replies View RelatedI want to create a Student class that is able to search, borrow, return, and reserve books. This is what I have done so far:
public class Student
{
private String username;
[Code].....
I think that I might need an array where to remember all of the books that the student has borrowed, but I'm not sure how to do that as well.
I have a swing jFrame set up with a control group which contains 3 radio buttons.
When one is clicked it sends its label to a jtextfield in a different class i have code parsing text by a term
Java Code:
Scanner s = null;
try {
s = new Scanner(new BufferedReader(new FileReader("/Stage_One.txt")));
s.useDelimiter("*");
String total = (s.next());
Pattern p = Pattern.compile("[]+");
[Code] ....
I just need to know how to access the jframe variables (textfields, panels and such) so i can use their inputs in code to filter a text file.
How should I call my findSmallest method in the main class.. Here is the code:
public class Tester {
public static void main(String[] args){
try {
BinaryTree<Integer> myTree2 = new BinaryTree<Integer>();
myTree2.insert(5);
myTree2.insert(2);
myTree2.insert(7);
[Code] ....
So the question is what kind of parameter I should pass in myTree2.findSmallest()??? Here is my findSmallest method..
public E findSmallest(Node<E> parent){
if(parent.left.left == null){
E returnValue = parent.left.data;
parent.left = parent.left.right;
return returnValue;
} else {
return findSmallest(parent.left);
}
}
I need to store the data of a bunch of objects of a particular class in files in a predefined directory. Later, I want to get all the files from the directory and turn them into the objects again. Ideally, I'd like to have one file per object and have the files be human-readable and editable without too much difficulty. The class used by the objects will likely be subject to change in the future, as well. To keep things simple, all the data members are either primitives, Strings, or arrays of them. What is the best library/API to use to deal with this situation? Or should I write my own classes for these operations?
I read into serialization, but I read that it doesn't deal well with classes that are frequently modified. I also found articles on Preferences, but none of the ones I saw seem to explain how to best handle reading and writing to and from multiple objects, especially when I don't know a prior all the objects that were written to disk.
Is it possible to generate a javadoc from .class files?
View Replies View RelatedI'm trying to build a method that can search a binary search tree for a specific target and then return the number of probes it took to get there. It seems to me that the best way to do this would be a recursive search method and a counter that tracks the number of calls. But I'm struggling with how to implement this. Here's the code I have so far. what works/doesn't work with the method.
// Method to search the tree for a specific name and
// return the number of probes
public T search(BTNode<T> btNode) {
[Code]....
The problem is what to do when the source file for a class gets too big ( a judgment call for sure). Is it possible for one class to be defined in multiple files and if so how do you do it, and is it good practice?
I do see ways to refactor into a base class or move code into a helper class but sometimes the abstraction is cleaner as a single class that does a lot of stuff. My problem is how to organize a BIG class?
I'm writing a custom class loader to load some .jar file
public class IQJarClassLoader extends ClassLoader {
private String jarFile = "json-simple-1.1.1.jar";
private Hashtable classes = new Hashtable();
public IQJarClassLoader() {
super(IQJarClassLoader.class.getClassLoader());
[Code] .....
I receive this exception :
Exception in thread "main" java.lang.ClassCastException: org.json.simple.parser.JSONParser cannot be cast to org.json.simple.parser.JSONParser
Everytime, because i don't cast. Casting an object to a class with the same name loaded by different classloaders is no different than trying to cast.
I want to create a search method that returns the frequency of a word in the search method.
public class IndexTree {
private class TreeNode {
TreeNode left;
String word;
int frequency;
TreeNode right;
[Code] .....
-I created the project with the checkbox "Create separate folder for sources and class files."
-I've tried running the program with the "mfq.txt" file in the root directory, the src directory, and the bin directory.
-I've even tried it in all three directories at once!
-I've also refreshed my project after each change in eclipse
-My error is the "FileNotFoundException" error
Here is the line giving me trouble
Scanner file = new Scanner(new File("mfq.txt") );
Where my code is wrong/where I should put my file? :tax:
We have a large applet based application with a current client-side minimum jar download size of ~4MB. If we put ALL of our class files into jars, that size will probably double. Most users only use a small portion of the class files for their particular tasks. Having ALL users download ALL the classes, compressed in jars, is extremely time consuming and a major problem after application updates due to the large number of users and the network load it would cause.
So after downloading some basic jars other needed individual class files are downloaded as and when requested by user. For signing applet, applet class files are moved to jar and this jar is signed with following attributes in manifest.
Jar file manifest:
Permissions: all-permissions
Codebase: *
Application-Name: XYZ
Application-Library-Allowable-Codebase: *
Trusted-Library: true
When applet is invoked from browser with JRE 1.7.51, there is a security blocked exception for individual files which are accessed from the signed applet jar. Why individual class files are blocked? Is it necessary to move all individual class files in a jar?
I'm having another issue. I have 2 java source files(see below). They are place in the same directory. How do I compile them using classpath?
I have already tried 1st attempt :
javac -cp com.companyname.interview.DuplicateReplace.java DuplicateReplaceTest.java [did not work!]
2nd attempt: javac -cp DuplicateReplace.java DuplicateReplaceTest.java [again, did not work!]
package com.companyname.interview;
public class DuplicateReplace { /* code */}
[Code] ....
I know that the simple deployment using only applet tags inside HTML causes severe security restriction for the applet on the client side. but can this simple HTML file contains .jar files inside the applet tags instead of .class files.
View Replies View RelatedI'm trying to make a update page where you search for person info by their number then have the ability to change any info and save it back to the binary field. I have the search working but i don't know how to do the update,.here my code:
Java Code: import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.EOFException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
[code]....
I have to create a dictionary in java using search trees. I have problems with the methods put() and remove(). Working properly, ie correctly adds a new element and eliminates correctly. But I should improve a few things.
As you can see from the interface, both methods must return an element of type V, that is:
- case put(): returns the previous value associated with key (or null if the key was not associated with any value)
- case remove(): returns the value associated with the key (or null if the key was not present in the dictionary)
I do not understand how come my put method always returns null even though in reality I make him return node.getElement().
Instead, the remove() method does not know how to modify it to make sure it returns the value associated with the key. If I change the helper method return value in V (instead of Node<K, V>) method does not work anymore...
How can I then edit these two methods?
Class SearchTree:
public class SearchTree<K extends Comparable, V> implements Dictionary<K, V> {
public int size;
public Node<K, V> root;
public SearchTree() {
root = null;
size = 0;
[Code] ....
I have a java program where there are bacteria that have to eat the food spread for a map, I have to find a way to optimize the search for food, I put random at the beginning I have to try a better way...
protected void Move(){
int dx = (int)(Math.random()*3) - 1;
int dy = (int)(Math.random()*3) - 1;
if (x+dx >= 0 && x+dx<food.getWidth())
x += dx;
if (y+dy >= 0 && y+dy<food.getHeight())
y += dy;
How to implement elasticsearch in java to do text processing. I am currently working in Windows OS with eclipse Kepler.
View Replies View RelatedConsider in a Document if a String " Hello" is Encoded and stored as "XYZAB"
I want to search the text on document for a word "Hello" and Replace the word with "HelloWorld"
The Program will encrypt the word "Hello" and Search the file then return the encrypted code as "XYZAB" Found
Now i have to replace the word "Hello" with "HelloWorld" in encrypted form so that the Letter "XYZABEFGHI" is replace in the place of Hello where "World" is encoded as "EFGHI"
Now the Problem is If there is more number of occurrence of the word "Helloworld" exist in the file... How can i Replace only one particular occurrence What can be done to select the particular occurrence.
I have attached my java program for Encryption along with this mail for your ease of use.
I want to do a simple search and replace regular expression of lines. I am very unfamilar with Java regular expressions, and I'm not sure how to do something as simple as what I want to do. I have lines that look like this...
Java Code : access_log /home/%USER%/access_log mh_sh_highlight_all('java');
I want them changed so %USER% changes to a string, such as "cyrus," so they appear like this ...
Java Code: access_log /home/cyrus/access_log mh_sh_highlight_all('java');
The reason I want to use regular expressions is because I want to use the replaceAll method of the java.lang.String object. If I use replace I have to convert my strings into char arrays, and my code becomes bulky.
I Write a Java program to parse a syntactically correct arithmetical expression and produce an equivalent Expression TREE. Remember, in an expression tree the terminal nodes are variables and constants, and the interior nodes are operators (such as +,-,*,/).
For instance the expression: (1 + 2) * 3 can be represented by the following tree:
INPUT Expression
(1 +2)*3
POSTORDER Expression
1 2 + 3 *
TREE [root=asd.reg.Node@56ddc58]
But when i Execute the program it Shows only Prefix and postfix .But the requered output is in inorder preorder and postorder so how to solve these error
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.tree.TreeNode;
public class InToPost {
private static String str;
[Code] .....
I am writing a java program which searchs data from a database on a website , my problem is that the url does not works on IE but works fine in other browsers..
private URL getURL(String selection) {
URL exampleURL = null;
String url = "http://www.example.com/list?keyphrase=";
if (selection.equals("mfcCode")) {
url += getURLcriteria(EditList.get(CurrentListIndex)
[Code] .....