Java Command - Find All Classes Inside A Package
Aug 21, 2014Is there any command to find all the classes inside a package?
E.g. : To find all the properties and methods inside a class String we use "javap java.lang.String" ....
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Classes Are In Same Package But Still Cannot Find Each Other So Won't Compile
Jan 22, 2015package 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.
How To Import / Access Classes Created In One Package In Another Package
Apr 30, 2014My 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.
View Replies View RelatedAdd Only Some Classes To A Package?
Mar 28, 2015I 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.
View Replies View RelatedUsing Java From DOS Command Line - Cannot Find Or Load Main Class
Nov 10, 2013When I try to run Java from the Windows DOS command line, I'm running into trouble:
1. When I run Java from the wrong directory, I get the error Error: cannot find or load main class myapp1.
2. When I get to the "right" directory (.../MyApp1/build/classes/myapp1/, which is where the MyApp1.class file resides), I get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: MyApp1 (wrong name: myapp1/MyApp1)
1. The CLASSPATH variable is not set (when I type echo %CLASSPATH% the system returns %CLASSPATH%).
2. I also get the same error above when I use: > java -cp . myapp1
3. I've made sure the PATH is set correctly in environment variables, with the Java path at the beginning of the path string).
Multiple Classes In One Package?
Jan 31, 2015I'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?
Import And Package Inside Class Definition
Feb 17, 2014I 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).
Cannot Access Class File From Package Inside JAR
Mar 7, 2015I'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 .
View Replies View RelatedAdding Package Name To Source-code When Compiling / Running From Command Line?
Apr 29, 2015I am operating java from the command line (using Terminal on Mac OSX 10.9.5).The current directory within Terminal is called "orange" and the following sourcecode file is in the orange directory :
Test1.java
package orange;
public class Test1 {
public static void main(String[] args) {
System.out.println("Test1 works");
}
}
This complies to Test1.class (visible in the orange directory) but when I try to run it in Terminal (simply using "java Test1" from within the orange directory). I get the following error message (which I don't get if I simply comment out the line //package orange;)
Exception in thread "main" java.lang.NoClassDefFoundError: Test1 (wrong name: orange/Test1)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
[code]...
Connecting Multiple Classes In Same Package
Jan 16, 2015I 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).
Running Classes From Command Line
May 30, 2014I'm suddenly having trouble running classes from the command line. Previously, things were working. I cant imagine I'm doing anything differently. The sample code is below:
Code:
class HelloWorldTester{
public static void main(String[] args){
System.out.println("Hello World");
}
}
Terminal output:
C:UsersmattmanDropboxProgrammingJava>javac helloWorldTest.java
C:UsersmattmanDropboxProgrammingJava>java HelloWorldTester.class
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldTester/clas
s
Caused by: java.lang.ClassNotFoundException: HelloWorldTester.class
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: HelloWorldTester.class. Program will exit.
JAR - Package Directory - Can't Find Or Load Main Method
Apr 24, 2015I am trying to understand how package(directory structure) and JAR files work interchangeably. From my understanding JAR is a package file format typically used to aggregate many Java classes. Since many classes are usually contained inside a package, I should be able to create a JAR file from a package, and use them interchangeably. A single JAR file is easier to handle then multiple classes and folders.
To test my understanding of the concept, I am working with the following project structure,
/development_directory
____/BookPackage
________Book.java
____BookDemo.java
Book.java contains the following code,
package BookPackage;
public class Book{
private String bookname;
public Book(String str){
bookname = str;
}
public String getBookName(){
return bookname;
}
}
and BookDemo.java contains the following code,
import BookPackage.Book;
class BookDemo{
public static void main(String ... args){
Book b = new Book("Lord of the Rings");
System.out.println(b.getBookName());
}
}
From the development_directory, I used the following commands to compile and run the project,
development_directory/ javac BookDemo.java
development_directory/ java BookDemo
...and it compiles and works as expected.Now, I will try to convert the BookPackage folder(package) into single jar file for portability, and I am using the following command to do that,development_directory/ jar -cf bookpkg.jar BookPackage ...this command generates the bookpkg.jar file.
I am going to remove the BookPackage folder to see if bookpkg.jar file really works as a replacement for the BookPackage directory structure.
After removal of BookPackage folder, the development_directory structure looks like this,
/development_directory
____bookpkg.jar
____BookDemo.java
Now, I tried to use the following commands to see if the program works as before,
// to compile
development_directory/ javac -cp ./bookpkg.jar BookDemo.java
...it compiles without any error - this means the replacement of bookpkg.jar for BookPackage(package) folder structure is working - Am I correct?
// to run
development_directory/ java -cp ./bookpkg.jar BookDemo
...And I hit an error,
Error: Could not find or load main class BookDemo
But the BookDemo class is at default namespace - why it JRE won't be able to find the main method?
And, the way I am trying to replace package folder structure with a single JAR file - am I getting the concept correctly?
Nesting Interfaces Inside Classes
Jun 20, 2014When are we allowed to nest interfaces inside a class? Would this be possible? Why or Why not?
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Jul 22, 2014I am trying to execute a program from the command prompt. I type java -jar zuul.jar (zuul is the name of my project) and I get a message that java is not recognized as an internal or external command. What do I do wrong?
View Replies View RelatedCommand Prompt Can't Find Hello World Program
Jun 7, 2014I just created a Hello World program in Notepad, but command prompt still can't find it even when ran as administrator. I've even tried to use command line to run Hello World programs I've created with Eclipse but it still doesn't work. Here's proof I have JDK setup as PATH:
I've even tried having the JRE as path but that still doesn't solve my problem. I'm really trying to learn Java programming but this problem is holding me back.
Applets :: Can Not Find Needed Classes
Feb 25, 2014I have a HTML page with an applet inside it.I have the applet class and all other needed classes in a jar file in jre/lib/ext folder (I'm on windows). But when I open the HTML file in a browser it gives me ClassNotFound exception..The HTML file is this:
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1252">
<TITLE>
DPI 3270 Printer Session
</TITLE>
</HEAD>
<BODY topmargin="0" leftmargin="0">
<SCRIPT SRC="HODVersion.js" LANGUAGE="JAVASCRIPT"></SCRIPT>
<P>
[code]....
I have this HostOnDemand class in its package in a jar file in jre/lib/ext but it can't be found.Since the applet is way too old, I'm using jre1.4.2 and netscape.
Error Using Abstract Classes - Cannot Find Symbol
Feb 2, 2014I am stuck. It seems like I have done everything by the book but I keep getting the same error: cannot find symbol. The error is specifically addressing lines 9, 10, and 11 in the Alien class file. All that is supposed to happen is an output of information for the two types of aliens.
Java Code:
import javax.swing.*;
public class CreateAliens
{
public static void main (String[] args)
{
Martian aMartian = new Martian();
Jupiterian aJupiterian = new Jupiterian();
JOptionPane.showMessageDialog
(null, "
[Code] ....
How To Draw Multiple Graphics Inside One JPanel Using Multiple Classes
May 5, 2015I'm very new to Java, and I am creating a program that takes multiple user input to create one face. I have a class for the eyes, nose, lips, and headshape. For some reason, my program is not drawing the graphics. ***for question purposes, I have only included my head shape class and my test class****
my "test" class:
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class FaceTest
{
public static void main(String[] args)
{
String head = JOptionPane.showInputDialog("Would you like a circle, square, rectangle shaped head?: ");
[Code] ....
Java Import Not Working In Package?
May 20, 2015I 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.
How To Package Java Application With JAR Files
Apr 16, 2014I 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.
Java DLL - UnsatisfiedLinkError When Moving To Package
Jan 13, 2015I 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.
Does Importing Whole Package Use More Memory Than Only Importing Specific Package Parts?
May 22, 2014Let'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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Jan 9, 2014I have written a sample java program, in which I have imported a package com.ibm.mq.
While compilation in as400 machine,I am getting an error like package com.ibm.mq not found.
I have set classpath and also run a hello world program.
Run Bash Command From JAVA On MAC
Nov 17, 2014import java.io.File;
import java.io.IOException;
public class ReadAllFilesinFolders {
public static File folder = new File("/Users/path/Documents/test");
public static void main(String[] args) {
[Code] ....
How To Run Telnet Command In Java
Jul 30, 2014How to run Telnet Command in java?
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Aug 7, 2014I am trying to interact with the command line prompt and script the responses for some config. When asked if user wishes to continue I would like respond yes or no, however I would like this response to be automated without any user interaction. I am able to launch the .exe file however when the command prompt is launched I cannot get any further responses to it.
p Java Code: ublic static void runConfigure(String[] refBox1,String outDir2)
throws IOException{
String s = null;
try {
[code]....