What Is A Package

Sep 3, 2014

my new class had me download eclipse and for some reason it won't let me type anything until I create a document. creating a document creates a package and that lets me create a class which then it will let me start typing code...so wtf is wrong with eclipse and why is it bulling me into having this "package" line in my code when I never had anything like that in other ide's?

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How To Import / Access Classes Created In One Package In Another Package

Apr 30, 2014

My working directory is e:ajava. in package p1 i create two classes c1 and c2. net beans creates three files e:ajavap1srcp1, e:ajavap1srcc1, e:ajavap1srcc2. package runs without a hitch. i create another package p2 under e:ajava. i want to use class c1 in p2. pray what on earth should be my import statement in the p2 source code after the first statement 'package p2'. another related querry what should i include in my class path so as to gain access to c1 and c2 in source code of p2.

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Does Importing Whole Package Use More Memory Than Only Importing Specific Package Parts?

May 22, 2014

Let's say hypothetically you're making a huge program and use a lot of imports (ex import java.util). If you only need a few specific things from java.util, will it use more memory importing java.util.* compared to only importing lets say java.util.Scanner, java.util.ArrayList, etc. Basically does importing a whole package use more (if any at all) memory than only importing specific package parts?

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Add Only Some Classes To A Package?

Mar 28, 2015

I have a folder of classes that I am packaging together. Some classes are being packaged and compiling just fine. My other classes in the same package, however, are saying that they cannot find these classes.

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Creating A Package File

Aug 14, 2014

Though have been playing around with my ebook but finding it difficult to get along with the topic PACKAGE&INTERFACES, I find it challenging to write a package file despite the book I currently studying and online tutorial.. so I want a more explanatory format to comprehend the piece cos without knowing it.

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Error - Package Does Not Exist

Jan 25, 2014

I am trying to make a jar file in intelliJ. My directory that holds all the java classes is C:rafficProjectsrccege. In cege there is a package ui where there is a class GuiMain. And I have imported the GuiMain() in my Main() class.

I have this code lines:

package cege;
import cege.ui.GuiMain;

and when I use the terminal in the intelliJ and write the command:

C: rafficProjectsrccege>javac *.java

I get this message:

Main.java:3: error: package cege.ui does not exist

import cege.ui.GuiMain;

but actually, I have already put this line in my code. what could be the problem?

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Multiple Classes In One Package?

Jan 31, 2015

I'm having problems with this I've code like:

Java Code:

Public Class{
Objects
Constructor(){}
ActionListener Method(){}
Main Function()}

[Code]....

but I cannot declare variables in this method, how can I do this what can be the simplest method?

In addition: I've a marksheet class, a calculator class, & in main class I've 2 buttons one for marksheet & one for calculator, how can I make it so that if user clicks on marksheet button that class should be called & so?

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Package Not Recognized On Import

Oct 16, 2014

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] ......

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Inheritance Failure In Same Package

Feb 24, 2014

I've tried to write a package and two classes this way:

<path>/pack/Aclass.java
Java Code: package pack;
public class Aclass<T> {
private T t;
public void set(T t) {
this.t = t;

[code]....

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Java Import Not Working In Package?

May 20, 2015

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.

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Running Program In UNIX With Package

Feb 11, 2014

i have a program in UNIX directory /home/me/java/src

package bin;
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World");
}
}

I have manage to compile it successfully(class file will be in bin directory) using command below: javac -d /home/t_bmf/java/bin HelloWorld.java

My problem now is how would I execute the class in bin directory in UNIX? I already tried different ways on how to execute it as suggested in my internet research The one I tried is this:

java $CLASSPATH:.:bin/HelloWorld
but I got this error message:
Exception in thread "main" java.lang.NoClassDefFoundError: :/:bin/HelloWorld
Caused by: java.lang.ClassNotFoundException: :.:bin.HelloWorld

[code]....

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Get The Value Of A Variable Stored In Another Class Of Another Package?

Nov 12, 2014

Source packages

1.First package : CarDealer.java (JFrame form)

2. Second package : Vehicle.java (JFrame form)

- The user runs CarDealer JFrame in which appears a JTexField in which he types in some characters (pretending he types some data about selling licence).
- The user clicks on the JButton "Save" that stores the characters typed in inside a String variable called strLicence.
- The user clicks on the JButton "Open 'Vehicle Form'" that opens the Vehicle JFrame.
- Finally, in the Vehicle JFrame I want to write a code that can see/use the value of the String variable called strLicence.

In other words, for example, I want to store the value of strLicence in a new variable declared in the Vehicle class.

(Actually I'm working with a long and elaborate project for the dissertation of my bachelor's degree, so, for cutting to the chase, I simplified it by creating an essential JFrame project.)

I used netbeans

1. CarDealer.java

package Firstpackage;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JFrame;

[code]....

I also attach the netbeans project in a zip file ....

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How To Package Java Application With JAR Files

Apr 16, 2014

I have created an application that I wish for people to be able to run from command line, like so:

java myApp [filename]

Problem is my application uses functions from 3 .Jar files.

Here is how my folder(Assume it is called MyApplication) currently looks:

Application(folder)(contains .class files + source code)

jar1.jar
jar2.jar
jar3.jar
Manifest.txt

I understand I need add some information to the Manifest.txt file but I am struggling in adding stuff to it in the correct format.

Assuming the above folder is called my MyApplication, what I need to put in the Manifest and how to build it all as a Jar File.

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Class Cannot See Its Own Protected Variable From Another Package

Jan 30, 2014

how access levels work from subclasses and other packages, and I have discovered that a class cannot see it's own protected variable from another package which I thought it would be. I know that it says in the java docs "The protected modifier specifies that the member can only be accessed within its own package (as with package-private) and, in addition, by a subclass of its class in another package." but I thought that would also include it's own class.

Java Code:

package food;
import food.fruit.*;
public class Food {
protected int protecte = 5;
private int privat = 5;
protected void method(){

[Code] ....

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Connecting Multiple Classes In Same Package

Jan 16, 2015

I have multiple classes in one package and was wondering how to I use one class while in another?

What I mean is I have one sheet with a class and another sheet with another class. (Separate tabs in Eclipse).

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Runtime Error In Package Program

Jan 20, 2015

Iam getting this error at run time while using this command "java mypack.Accountbalance". I have compiled this source code and got its class file that I have put in mypack package but now its showing this error ..

Here's the code :
package mypack;
class Balance
{
String name;
double bal;
Balance(String n ,double b)

[Code] .....

Error:
exception in thread "main" java.lang.NoClassDefFoundError: mypack/Ba
at mypack.Accountbalance.main(Accountbalance.java:25)
used by: java.lang.ClassNotFoundException: mypack.Balance

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Use Random Class From Util Package

Apr 19, 2014

New York City temperature ranges for 12 months are given below:

Jan Feb Mar Apr May JunJul Aug Sep Oct Nov Dec
25-38 26-40 34-4843-58 52-68 62-7768-83 60-75 49-65 41-54 31-4347-61

1.Create an int array of size 366 to save the daily temperatures for a leap year.
2.Fill the array with randomly generated numbers between the ranges for that month. For example, for the first 31 days of the year (that is the month of January) randomly generate numbers between 25 and 38. For the next 29 days (the Month of February) randomly generate numbers between 26 and 40, and so on for every month.

The formula for generating random numbers between two numbers m and n is, (int)Math.floor(m + Math.random() * (n-m+1)); Or you may choose to use the Random Class from the util package.

3.Print the average temperature for each month.
4.Print the hottest day for the entire year, in the following format: Example: The hottest day was Thursday, July 4. Also, mention what the temperature Was on this day. You may assume that January 1 was a Monday.
5.Print the coldest day for the entire year, in the following format: Example: The coldest day was Tuesday, February 12. Also, mention what the temperature was on this day. Again, assume that January 1 was a Monday.
6.How many days in the year was it below 330 F and how many more than 750F.

So far i Have this

import java.util.Random;
public class NYCTemp
{
String [] days = {"Sunday","Monday","Tuesday","Wednesday","Thursday ","Friday","Saturday"};
String [] months = {"January","February","March","April","May","June" ,"July","August","September","October","November", "December"};
int [] daysInMonth = {31,29,31,30,31,31,30,31,30,31,30,31};

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Classes Are In Same Package But Still Cannot Find Each Other So Won't Compile

Jan 22, 2015

package demoServlet4;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ListenerTest extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse response)

[Code] ....

Above is the code for three classes. class Dog compiles fine but other two classes cannot find Dog.

Following is the classpath and the JAVA_HOME

classpath = .;C:Program FilesApache Software FoundationTomcat 8.0libservlet-api.jar;C:Program FilesApache Software FoundationTomcat 8.0libjsp-api.jar

JAVA_HOME= C:Program FilesJavajdk1.8.0_25bin;

I am using javac -d WEB-INFclasses WEB-INFclassesdemoServlet4ListenerTest.java and javac -d WEB-INFclasses WEB-INFclassesdemoServlet4MyServletContextListener.java to compile the classes.

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Java DLL - UnsatisfiedLinkError When Moving To Package

Jan 13, 2015

I have a class that works only when in the default package. If I move the class to a package I receive UnsatisfiedLinkError.

This is the class in the default package(this works fine):

[code]
public class CsharpConsumer {
    private native int reigsterAssemblyHandler(String str);
    public CsharpConsumer() {
            String dir = System.getProperty("user.dir");
            System.load(dir+"dllscardJNICsharpBridge.dll");
            int reigsterAssemblyHandler = reigsterAssemblyHandler(dir+"dllscard");
    }
}
[/code]
 
If at the top of this class I add "package DLLUtils;"

the error is "Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError:

DLLUtils.CsharpConsumer.reigsterAssemblyHandler(Ljava/lang/String;)I"

I tried a lot of things but none solved the problem. I must move the class to o package because I cant "import CsharpConsumer;" from default package.

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Import And Package Inside Class Definition

Feb 17, 2014

I am puzzled by a note in the book I am reading (by Mala Gupta). Page 55 says "All java components you've heard of can be defined within a java class: import and package statements, variables.....". But the online oracle doc (tutorial) clearly says the following 2 statments:

"If present, package statement must be the very first line in a file"

"To import a specific member into the current file, put an import statement at the beginning of the file before any type definitions but after the package statement, if there is one. " (Here).

So, how can import and package be present inside a class ? (This seems to go against the 2 statements from oracle online tutorial).

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Cannot Access Class File From Package Inside JAR

Mar 7, 2015

I'm trying to access class file which is inside the package and package is inside the jar file but I can't access that class file inside my source file . All files are on desktop .

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Label Refresh Function Does Not Work With ACM Package

Feb 8, 2014

I'm trying to setup a function that takes input from a user and prints it onto a label and updates it per entry. The updating would occur through removing the old label and then adding a label with the updated value. The text would be center-aligned. While I'm able to get the label to print the current value of "entry", it does so without removing the label with the old value.

I tried reversing the add(label) and remove(label) to see if there is a syntax error with remove, and I determined from the label not being there at all that remove was called correctly. I have kept the loop infinite for debugging purposes to work with various test cases as they come to me.

Java Code:

import acm.graphics.*;
import acm.program.*;
public class testCanvas extends ConsoleProgram {
public void run() {
GCanvas canvas = new GCanvas();
add(canvas);
String entry ="";

[Code] .....

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Package Import Javax Servlet Does Not Exist

Jan 7, 2015

I'm using jdk1.5.0 and Tomcat 5.5. I recently edited my class path to

javac -classpath = "C:Program FilesApache Software FoundationTomcat 5.5libservlet-api.jar;."

But i still get errors at compile time

Package import javax.servlet does not exist

Package import.javax.servlet.http does not exist

What might i be doing wrong?

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JavaFX 2.0 :: Custom Icons Into Bundle DMG Package

Jul 21, 2014

I created an ant script to create an installer for my JavaFx app:
 
<?xml version="1.0" encoding="UTF-8"?>
<project name="app-javafx" default="do-deploy" basedir="." xmlns:fx="javafx:com.sun.javafx.tools.ant">
    <property name="java8.jdk.home" value="/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home" />
    <property name="javafx.tools.ant.jar" value="${java8.jdk.home}/lib/ant-javafx.jar" />
    <target name="init-fx-tasks">

[Code] .... 

During compiling I see:

Using base JDK at:

/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk
  Using default package resource [Bundle config file] (add package/macosx/Info.plist to the class path to customize)
  Using default package resource [icon] (add package/macosx/app.icns to the class path to customize)
Creating app bundle: /Users/Utente/Documents/workspaceServer/javafx/target/deploy/bundles/app.app
Config files are saved to /var/folders/q6/vmt_h0tx3rgdbt_4h2_2f3780000gn/T/build6635061168386632777.fxbundler/macosx.

Use them to customize package.
fxbund
ler/macosx. Use them to customize package.
 
So I get files inside the temp directory and I copied them inside my project target directory. Unfortunally javafxbuilder don't use them to customize the package so I think the path where I have to put that files is wrong.

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JavaFX 2.0 :: Native Package For Mac And Relative Path

Dec 3, 2014

I done a small application with Javafx that start an Embedded Jetty. All works fine in Windows also with native package. Instead in Mac it works only before native packaging. Seems that the problem is how relative path are considered.
 
The tree of the content is this:
myfile.jar
webapp (folder)
libs (folder)
 
Look at this code:
 
                String webAppDir = "webapp";
                File f = new File(webAppDir);
                log.debug("Path webapp folder: " + f.getAbsolutePath());
                if (!f.exists())
                    throw new Exception("The folder " + f.getAbsolutePath() + " doesn't exist");

[Code] .... 

The problem is that before the packaging in Mac the relative path is that where the main .jar is located an so the code works because the webapp folder is found. Instead after the bundle the path became /Users/MyUser/webapp and of course the folder is not found because it is bundled inside the file.app near the libs folder.

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JavaFX 2.0 :: Preloader Not Shown Into Native Package

Jul 28, 2014

After some attempts I seen that my preloader is not shown using native package (Windows and Mac).
 
Running the jar that is run from the file.exe instead I can see the splash screen.
 
This is the relevant part of my build.xml

<fx:application id="fxApplication" name="app" version="3.0" mainClass="it.app.Main" preloaderclass="it.app.preloader.SplashScreenUi" toolkit="fx" />
 
As said, running the jar file instead of exe file the splash screen is displayed.
 
I printed some logs into splash screen class: when I run the app from the jar this logs are printed, instead when I run the app from .exe file these logs are not present.

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