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?
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.
I want to import an image to resize but not sure how to start of.Should I be using the "BufferedImage & ImageIO.read" method or the "paint(Graphics g) { Image img1 = Toolkit.getDefaultToolkit().getImage" method?
"Import org.apache.commons.codec cannot be resolved", which after searching seems to be a somewhat common problem. The solution being to go to: FileUpload - Home and download some jar file and add it to the /web-inf/lib folder. yet the error persists even after adding the jar file in "add external jar files" and restarting eclipse.
The jar file I added is called "commons-fileupload-1.3.1.jar" which is the only one I could find in the zip file. I've searched around looking at numerous threads about the issue, several of them sadly several years old, with no success.Surely installing a library to eclipse shouldn't be this complicated?
I have been working on project (developing web interface for generating dynamic reports)for that i have downloaded dynamic reports library and i want this library to be imported for my project to jsp page on netbeans 7.2 how can i do it?
i am trying to calculate the number of months it takes to pay off a set amount of credit card debt given the following information: principle amount, annual interest rate, and monthly payment. How to import the formula necessary to system.out.print the answer (number of months it takes to pay off debt) ???
When importing static members of a class. Why are they only accessible within the constructor of the calling class, and not outside of it? Here's the source code to understand my question.
package Certification; public class ExamQuestion { static public int marks ; static public void print(){ System.out.println(100);
Ok so I know how to import a csv using java. What I'm curious about doing is importing a csv using file chooser, reading the data, sorting the data out by certain parameters, and then outputting a count of each parameter I chose. Say for example I have columns 1,2 and 3. Column 1 has the name, column 2 has the percentage, column 3 has an o'clock time. I want to use queries to sort through the parameters and have a count of each parameter I choose...
I'm currently using TextPad or command prompt to compile and run my programs, and as usual I am not having any luck importing external libraries, in particular apache commons.
I couldn't see any particularly obvious settings in TextPad to set a library or class path (which is annoying as I really like the program), so I jumped back to cmd prompt to run it from there. Aaaaaand i don't understand .
This is my file structure at present:
/mainProject //includes .java and .class files, and where I've successfully placed .jar files before.
The apache commons zip file was extracted here, making:
/mainProject/commons-lang3/apidocs/orgs/apache/commons/<folders> //the commons-lang3 folder contains the jars I'm navigating to the /mainProject folder in cmd prompt and typing (amongst many other things) javac -cp /mainProject/commons-lang3 MonsterGame.java //with the -cp being pointed at the folder the .jar is in i've tried pointing it at the root folder where the import statement begins in the code (ie mainProject/commons-lang3/apidocs), tried moving the .jar files to the mainProject folder (pointing -cp at it) and more. No luck.
it seems everytime i try to import a new library something goes wrong..... its become a bit of a stumbling block to be honest. I seem to spend most of my time dealing with the 'administrative' side of coding (that was the politest way i could put it ), am I not doing it right?
I've read I'm supposed to include the .jar in the classpath, not just the directory. is this correct? (it still doesn't work...!)
I've been trying to write a program for some time now, but im encountering problems while trying to complete it. The program has a student class and a course class (set up with some info about the class, like #, professor name, course title, course time). Now, i have a text file in the workspace, and i have to import the data from the textfile, and thats just what i did, but then there is an option which allows the user to delete a course only by inputing the course number, and when he does that, the program outputs the course's name, and confirms the deletion of the course (From the student's record, i created a vector for that and imported all the courses from the text file). But how can i let the program know what's the name of the course when the user inputs the course number ???
When the data is read from the file, objects should be created and added to the student's course record. <- i think here's where i messed up ? i imported the data, but how can i actually make them objects before adding them into the vector ?
PHP Code:
public static void main(String[] args) throws IOException { Scanner scan = new Scanner(System.in); Vector Record = new Vector(); try {FileReader filereader = new FileReader("CLASSES.txt"); BufferedReader bufferedreader = new BufferedReader(filereader); String test = ""; while(test != null) { Record.addElement(test); test = bufferedreader.readLine(); } mh_sh_highlight_all('php');
1. Tried to use setLayout() but it wouldn't let me. Have imported libs
import javax.swing.*; import java.awt.*;
but it doesn't work. It only worked when I extended a class with JFrame. Why do I have to do it? I already have a JFrame instance:
public test(){ JFrame frame = new JFrame(); frame.setTitle("Workshop"); frame.setBounds(500,300,400,300); frame.setVisible(true); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); .... }
This code runs smooth, so it's confusing for me that it lets me create a JFrame object, and put buttons onto it, but it wants me to extend the class onto JFrame class in order to use a method.
2. I've read somewhere that AWT is old and should not be used anymore. Is there a diagram or a list with objects and properties that are manipulated only by Swing so that I could concentrate only on those? For example (made up list):
Have an issue with deploying our application, which comes in two parts, with javaws . In our installer (which is coded in NSIS) we call javaws twice, each time referencing a different jnlp file. It looks like this:
I am trying to write a specific byte sequence to a specific memory location on a removable storage drive. Does Java allow me a way to do this? I know the dangers in accessing memory, but the memory location of the data that will be written will never change.
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?
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.
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.
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?
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?
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);
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
