Usually, most of the time, I import the standard java stuff.But what happens when I find a code with a list of those com. imports:
import java.io.File;
import java.io.IOException;
import com.itseasy.rtf.RTFDocument;
import com.itseasy.rtf.text.Border;
import com.itseasy.rtf.text.Field;
Where are these imports and how do I "get" them?
I was wondering how Java knows where to Import classes from when we don't specify the whole directory path.
For example: import java.util.* Does It automatically search In both your current directory and the directory created during Installation that contains the standard library (wherever It may have been Installed) ?
The purpose of this program is to import via keyboard Numbers.txt and calculate the mean and standard deviation to Results.txt.I am able to get the mean calculate but when I open the Results.txt the standard deviation is 0. I don't know what is wrong with my code, but I believe it has something to do with the scanner being close. Here is the error message i receive after inputting Numbers.txt.
java.lang.IllegalStateException: Scanner closed
at java.util.Scanner.ensureOpen(Unknown Source)
at java.util.Scanner.hasNext(Unknown Source)
at StatsDemo.main(StatsDemo.java:48)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)
Java Code:
import java.text.DecimalFormat; //for number formatting
import java.util.Scanner; //for keyboard input
import java.io.*; //for using files
public class StatsDemo
{
public static void main(String [] args) throws IOException
[Code] .....
How to use a .class file I unpacked from a .jar file I downloaded from the Internet.
I downloaded the commons-io-2.4.jar file from commons . apache . org /proper/commons-io/
In it you can see that there is a class called FileUtil.class:
jar tf commons-io-2.4.jar | grep FileUtil
org/apache/commons/io/FileUtils.class
I extracted this with the following command:
jar xf commons-io-2.4.jar FileUtils.class
It is now in ..uk/ac/ebi/bioinvindex/services/datasearch/commons/FileUtils.class
Now, I have a java file where I would like to use FileUtils.
How do I do that? How do I import it?
I am trying to write a program, which includes an import data option. This option is used to import information from a text file.
The data is read from the file and objects are created and added to the student's record (The text file contains some information of the courses that the student is taking).
So my question is, how do i import information from a text file ?
and after they are imported, how do i create the objects in order to add them to the student's record ?
I would like to build a GUI where by I can import a text file and interrogate certain values and then display them in a window. Thing is I would like to know what window type that will support this. i.e Panel,internal frame,dialog box.. etc etc... I am using Netbeans.
View Replies View RelatedI am trying to figure out how to import a txt file that has a color and a four digit number. Everything that I have tried comes up with some kind of error.
import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import java.util.InputMismatchException;
[Code] ....
I couldn't find an edit button. I need to store the String and int from the txt file into an array. The problem that I keep having is that the compiler seems to want it as either two ints or two Strings.
I have a AbstractTable and would like to import a txt file into it. I know how to do it for a Default Table but I am not allowed to use it.
// Import Filechooser
public static ActionListener importChooseFileButtonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser jfc = new JFileChooser();
int returnVal = jfc.showOpenDialog(jfc);
ImportPopup imp = new ImportPopup();
[Code] ....
What do I have to do to import the file into the table?
Whenever I use a control inside an .fxml file like:
<Label></Label>, <TableView></TableView>, etcera ...
I get an exception for example:
Label is not a valid type., TableView is not a valid Type., etcera
This exception I then solve with placing an import tag inside the .fxml file.
However as I do not know each import name, I have to look this up like writing down:
Label label = new Label();
inside a class and then place my cursor on it to see which import name Eclipse generates.
This import name i then put inside the .fxml file with <? import ?> beginning and end tags with question marks around it.
Is there anyways to automatically generate these import tags inside an .fxml file even if you don't know the import name for the control you want to use?
How to import data from a file using Object Oriented Programing? I know how to write OOP Java and I know how to read data from a file in Procedural Java but would like to know more about how to do it OOP. Is it the same as reading data process as in Procedural programming?
View Replies View Relatedaccdg to this: [URL]....
we can use EL expression as follows:
${pageContext.request.contextPath}
but there's no instructions as to how I will set its value.
And also, what would happen in case I refer 2 css files in my jsp and both defines the following:
CSS 1 :
body { background-color: #fdf5e6;
font-size: 810px;
}
CSS 2:
body { background-color: #fdf5e6;
font-size: 50px;
}
i am migrating my web application from Server1 (Tomcat 5 and Java 1.5) to Server2 (Tomcat 7 wand Java 1.6).
In my web application, I have multiple adapters (web clients) that are connecting to external web services, https interfaces, sftp servers etc.
In order to connect with all these external interfaces, i have installed multiple certificates in my JRE keystore on Server1.
Now since the application is going to be migrated to Server2, i need to know if there is any way I can import all the existing certificates from Server1 JRE to Server2 JRE?
Since the application has been running on Server1 for a long time, I am not sure, what exactly is a complete list of certificates that I need to install on my Server2 JRE.
So i am kind of looking how can i generate the keystore file with certificates from the existing server1 JRE and then import it into Server2 JRE.
Does this command provide a list of all the installed certificates on my Server1 JRE?
server1:/webdienste/java/jdk/xxx/current/jre/lib/security> sudo /webdienste/java/jdk/xxx/current/bin/keytool -list -v -keystore cacerts | grep Eigner
The other solution i can think of is to manually download/save all the certificates by opening all the URLs in the browser and then import the .pfx files through keytool into my Server2 JRE.
how to make a simple game. I am having trouble when it comes to adding sound though. It tells me to do this:
package net.game.Game;
import java.applet.Applet;
import java.applet.AudioClip;
public class Sound {
public static final AudioClip BALL = Applet.newAudioClip(Sound.class.getResource("ball.wav"));
public static final AudioClip GAMEOVER = Applet.newAudioClip(Sound.class.getResource("gameover.wav"));
public static final AudioClip BACK = Applet.newAudioClip(Sound.class.getResource("back.wav"));
}
What this does is it gets the sound file then gives it a name(BALL=ball.wav GAMEOVER=gameover.wav ect..) and then there is other code in other classes that call the sound so it will run but it keeps giving me an error and I don't know what to do. How can I get it to import the sound? Here is the error.
PHP Code:
Exception in thread "main" java.lang.ExceptionInInitializerError
at net.game.Game.stuff.<init>(stuff.java:35)
at net.game.Game.stuff.main(stuff.java:62)
Caused by: java.lang.NullPointerException
at sun.applet.AppletAudioClip.<init>(Unknown Source)
at java.applet.Applet.newAudioClip(Unknown Source)
at net.game.Game.Sound.<clinit>(Sound.java:7)
... 2 more
I see you can import in 2 ways:
import java.util.*;
or
import java.util.Scanner/Random/etc;
if I used the first one it imports all the librarys within that (directory?). If so would that add to a bigger file size?
I'm making an import/export of xml - I have the import of xml sorted I'm just trying to finish off the export. My export class is called XmlWriter.java. Inside the class I have an updateFile method to update an xml file as such:
public void updateFile(Environment environment,Document doc)
{
// code
}
I then in my main method have
public static void main(String argv[]){
//declare new object of class
XmlWriter xmlWriter = new XmlWriter();
//test testUpdate method
// xmlWriter.testUpdate();
Environment environment = ;
[code]....
I don't know what to make my variables equal to - eclipse keeps trying to use null but obviously that won't work. The Environment is another class that just contains getters and setters for the 3 different databases (that are in the xml file) and the getter/setter for the environment ID (also in xml file).
Often times i don't remember which package a specific class (like ArrayList) belongs to. Is there an easy way to find that java.util.* is what i need to import, if i wanted to use the class ArrayList ?
View Replies View RelatedI have imported several maven projects but I am trying to import a spring project via eclipse and it is not displaying. I did the following file->import->Existing maven projects->browse (found my project)->finish..... The project does not display and I cannot find it. I tired to do it again and the project cannot import because I cannot select it meaning it is already installed.
View Replies View RelatedI am still playing around with decks of cards, and am now trying to implement some visualizations using Applets.
Here is how I enter my deck of cards into an array list: this works just fine:
String[] Suits = new String[]{"S","H","D","C"};
String[] Values = new String[]{"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
ArrayList<String> deck = new ArrayList<String>();
for(String suit : Suits) {
for(String value : Values) {
deck.add(suit+"_"+value);
}
}
The end result of this is an array 'deck' which contains a string representing each of the 52 playing cards. Great.
Now I would also like to use some pictures for future implementations I am working on. I have 52 images (.png, though I doubt it matters) stored in the right place. They are named as "H_5.png", and "S_A.png", for example, just as I named the cards in the previous array. I would like to do something as follows
ArrayList<Image> deckpic = new ArrayList<Image>();
for(String suit : Suits) {
for(String value : Values) {
deckpic.add(getImage(suit+"_"+value+".png"));
}
}
Now of course this doesn't work. The line
suit+"_"+value+".png"
is a string, not the name of a file. How I have previously loaded images is to use something like this:
the_pic = getImage("picture_of_pony.jpg");
but of course I can't use the quotations in my card loop, since I want "suit" and "value" to range and not just be the strings suit and value.
I have the following data in a file called books.xml in my WEB-INF folder:
<?xml version="1.0"?>
<books>
<book>
<name>Padam History</name>
[Code] ....
I'm using the following code in a jsp:
<c:import var="bookInfo" url="/WEB-INF/books.xml" />
I know that it's finding the file because if I delete books.xml from the WEB-INF folder I get a FileNotFound exception.
However, for some reason it doesn't appear to be importing the data into the bookInfo variable.
I noticed this problem because when I try to parse it via:
<x:parse xml="${bookInfo}" var="output"/>
I get org.xml.sax.SAXParseException: Premature end of file.
When I try to display the data in the variable either by:
<c:out value="${bookInfo}" />
...or by means of a scriptlet (which I realize is not a best practice):
<%
String myVariable = (String)pageContext.getAttribute("bookInfo");
System.out.print("bookInfo=" + myVariable);
%>
...I get nothing.
BTW when I do:
<c:import var="data" url="http://www.tutorialspoint.com"/>
<c:out value="${data}"/>
that works fine!
This code doesn't recognise the package ( and therefore class ) timetest3, when I try to import it. The package I try to reference/call, follows, and works fine.
import javax.swing.JOptionPane;
import timetest3.TimeTest3;
public class timetest4 {
public static void main(String args[]) {
TimeTest3 time = new TimeTest3();
time.setTime(13,45,52);
[Code] ......
package statics;
public class Test_main {
public static void main(String[] args) {
Math.log(50.00);
}
}
I am able to use a Math method without importing the java.lang.Math. Which makes me think
1) What is the use of the import statement in java?
2) Is my IDE taking care of the import automatically?
I am using Eclipse IDE and JDK 1.7.
I have written a library in one project but cannot seem import to import it into my main project whenever I try Maven says it cant find it though it is installed in the repository and the .jar file is in the classpath.
mvn -v
Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T17:29:23+00:00)
Maven home: c:Mavenbin..
Java version: 1.8.0_31, vendor: Oracle Corporation
Stack trace
org.jclarion.clarion.lang.ClarionCompileError: Class Not Found:com.MyProj.app.MyClass near line:310 (selma012.clw)
at org.jclarion.clarion.lang.Lexer.error(Lexer.java:190)
at org.jclarion.clarion.compile.grammar.AbstractParser.error(AbstractParser.java:111)
at org.jclarion.clarion.compile.grammar.AbstractParser.importJava(AbstractParser.java:463)
at org.jclarion.clarion.compile.grammar.AbstractParser.emptyLex(AbstractParser.java:258)
[Code] ....
Library POM
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.MyProj.app</groupId>
<artifactId>MyClass</artifactId>
<packaging>jar</packaging>
[Code] ....
I am trying to understand the package and import functions.
The path to access the file " library.book" is
C:UsersKameshDesktopJava SessionJAVAOCA7ooklibrary
and i can see 3 txt files
Book.class
Book.ctxt
Book.java
while compiling i am getting <identifier>expected error.
Here is the code :
package library;
public class Book {
public String isbn;
public void printBook() {}
}
package building;
[Code] .....
The error i get is <identifier>expected.
I have xml-outout now i need to import to jsp page by using checkboxes...
View Replies View RelatedI'm getting errors on all the exceptions called EmptyCollectionException. I think this is because the import statement has a error on it but I'm not sure. I'm suppose to add methods for peek, isEmpty, size, and toString methods. I only started isEmpty also am wondering what I have to change from peek method if anything at all.
import jsjf.exceptions.*;//Error on jsjf
import java.util.Arrays;
public class ArrayStack<T> implements StackADT <T> { //Error on StackADT
private final static int DEFAULT_CAPACITY = 100;
private int top;
private T[] stack;
[Code] .....
So im trying to make a coin flip game in java. Im relatively new to the language and the only other language i knew was javascript so im still learning. Ive already made one before using just one class and putting all the code inside, but im now trying to do it with methods since im trying to learn them. The basic idea of the game is that the user picks how many coins they'd like to flip, they pick heads or tails, then the computer flips the coins and calculates if there was more heads or tails to tell the user if they won or not. Im not quite complete with the program as you can see but ive already run itno an error. I was just doing some tests on the code i already have and i found that when i call the method settingUpCoin in my main class the program terminates. So basically, when i run it, it executes userImp right, transform right, but then it dosent let you enter a value for howManyCoins and terminates before you get to settingUpCoin.
(Notes: this was all done in eclipse luna build or the java ide. The class files are all separate in the actual thing i just put them together here to demonstrate my code.
import java.io.IOException;
public class Coin
{
double myCoin;
int numOfCoins;
int counter;
double arrayOfCoins[] = { };
[code]....