Using A Variable From Main Class In Another Class
May 31, 2014
I have a program with 4 classes, all of them in the same package, one of them is the Main class, and in that class I declared a variable named "port" of type int. One of the 3 another ones is the class Connection class, which it requires the port variable. I want to use this variable in the Connection class. How can I do it?Both classes are shown below:
Main.java
package server;
/* Imports */
/* Another variables */
int port; /* <-- IS THIS ONE */
[code]....
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Jan 8, 2014
I've 3 classes.
1. Circle
2. GetInputFromUser
3. testCircle
package ABC;
public class Circle {
private double radius;
public double getRadius() {
return radius;
[Code] .....
In the testCircle class, in the line: getRadius = ui1.GetInput();
It's showing the error: The method GetInput(float) in the type GetInputFromUser is not applicable for the arguments ()
And when I do: getRadius = ui1.GetInput(rad);
It's showing the error: rad cannot be resolved
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Aug 1, 2014
So i declared a class in main class but it seems there's error when i compile:
constructor xx in class xx cannot applied to given types
This is my java class:
public class trainer extends person{
String classType;
public trainer(String name, String gender, String address, int id, String classType) {
super(name,gender,address,id);
this.classType=classType;
[Code] ....
And this is the way i declared in main class:
trainer tr = new trainer();
And what i want to do is:
tr.toString();
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Apr 1, 2015
public class Sphere {
public double diameter;
public double volume;
public double area;
public double fourThirds = 4/3;
public Sphere(double someDiameter){
someDiameter = diameter;
[Code] ....
I am trying to get this code so that I only enter the diameter once in the sphere object1 = new Sphere(4); but I can't get it to work right. I can get the diameter to work with the calculate volume and area methods but that's it.
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Mar 3, 2014
Im writing a simple program to understand classes and objects. Basically what I have is a file called Program.java where I have my main method.I have another file called Person.java which I want to use to create Person objects. That person can have a name, email adress, phone number, etc.I put both these files in the same folder.in Program.java my first statement is:
Java Code: import Person.java mh_sh_highlight_all('java');
My problem is that when I compile Program.java i get an error message saying that the package Person.java does not exist.So my question is, when you create a class that you want to use for objects, how do you import that class into your class with the main method so that you can use instances of your other class?
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Aug 31, 2014
// Add range to Vehicle.
class Vehicle {
int passengers; // number of passengers
int fuelcap; // fuel capacity in gallons
int mpg; // fuel consumption in miles per gallon
// Display the range.
void range() {
System.out.println("Range is " + fuelcap * mpg);
[Code] ....
I'm compiling it in Eclipse and this continues to show in the console display
Minivan can carry 7. Exception in thread "main" java.lang.NoSuchMethodError: Vehicle.range()V
at AddMeth.main(AddMeth.java:34)
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Oct 30, 2014
Need to use a ComboBox from another class (Beginning Java forum at JavaRanch)
When my file is saved it has the values off the main gui's comboBox in variable 'env' which I then write to file using. I just need to access the comboBox in my second class so I can use it in main as I'm using the wrong one atm- if that makes sense?
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Feb 5, 2015
THIS IS MY MAIN CLASS:
Java Code:
import java.io.FileNotFoundException;
public class PrimaClasse {
public static void main(String[] args) throws FileNotFoundException {
SecondaClasse oggettoSeconda = new SecondaClasse();
oggettoSeconda.controlloNomi();
[code]....
Now it's working and from the main class i can controll the second class BUT. i want that is the main class that ask the user name, and i want pass that value to the second class. what code i must change?why eclipse wants me insert this import java.io.FileNotFoundException; and this throws FileNotFoundException for not give me an error?
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Apr 17, 2014
How do I call a class within the main. For example, this is what i have in my code right now. I am trying to call the class BlackJackGame.
package blackjack;
public class BlackJack {
public BlackJack() {
BlackJackGame();
}
}
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Aug 7, 2014
I have 3 source file below
//Hello.java
public interface Hello {
public void sayHello();
}
//Espanol.java
public class Espanol implements Hello {
[Code] ....
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Mar 27, 2014
If I declare and ArrayList as follows
"public static ArrayList<Media> mediaList = new ArrayList<Media>();"
How can i access it in another class (main class)?
package Projekt;
import Projekt.Media.rating;
public class MainTest {
static MediaHandler myreg ;
public static void main(String[] args) {
myreg.addMovie(title, playTime, year, seen, directory, path, rating.four, quality, subtitles, language, writer);
}
}
I also have the variables declared but didn't include them for readability.
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May 21, 2014
I had the question of what this was. [URL] ....
In summary, the Class XCopy's Main method creates an instance of the XCopy Class. So, now knowing that this can and does occur my next questions to myself were:
When would I do this?
How can this best be used?
Is this just another option available to a Java developer that has no other special significance?So far have no answers for myself.
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Jan 29, 2014
I've written a program just for the sake of it (to learn) and it seem's like theres quite a lot in the main method that perhaps could be split up into seperate classes. I'm not too sure where should start with this though, or what my thought process should have been as I was writing the program.
import java.util.Scanner;
public class Loops {
public static void main(String[] args) {
int answer = 16;
Scanner scan = new Scanner(System.in);
// Question
System.out.println("What is 4 x 4 ?");
[code]...
--- Update ---
here's a version without code comments as they might make it harder to read here -
import java.util.Scanner;
public class Loops {
public static void main(String[] args) {
int answer = 16;
Scanner scan = new Scanner(System.in);
System.out.println("What is 4 x 4 ?");
int userAnswerInt = 0;
[code]...
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Sep 23, 2014
I have permanently set the path of bin of JDK 1.6 in the environment variables of my system. I am able to compile any of my java programs successfully. But when I give command to run the program I am getting an error "could not find or load main class".
When I write the command "set classpath=.;" program runs successfully. I want to know whether I have to set this classpath everytime I run a new progaram. Is there any permanent way to set classpath ?
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Mar 1, 2015
I creates this simple code (shown below) inside a package of a major opensource code (i.e., openSHA), but when i run it the following error appears. The error mentions a class named "KT_testGmpeForScenarioRupture" that i wrote before and did not run showing exactly the same error.
Code:
package org.opensha.sha.gcim.imr.attenRelImpl;
public class KT_Test {
private static void main(String args) {
int x=4;
System.out.println("x is " + x);
}
}
Error: Could not find or load main class org.opensha.sha.gcim.imr.attenRelImpl.KT_testGmpeF orScenarioRupture
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Mar 18, 2014
I have few queries regarding compiling v/s execution of a java program. Suppose I have a Main Class which is referring to class Test which is present in JarA. Now, at compile time, this jar JarA must be present in classpath/buildpath. So, what actually is the action performed by the compiler by referring to this jar?
Now, at runtime also, this jar should be present to execute the Main class. Is this correct? If yes, then what is the action performed by JRE when it refers to this class at runtime? WOn't all the dependencies be resolved at compile time only?
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Feb 9, 2014
This time I have to make a Black Jack game ( I guess this is a classic) I have created Three classes for this BlackJack( Main), Card, and Player.
What I am trying to do is put the Give one card to the player and remove it from the deck into a separate procedure because I will be doing this several times during the game.
This is the code I have so far Under the class BlackJack.
Java Code:
package black.jack;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
[Code] .....
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Nov 19, 2014
I am using Netbeans as my IDE and I have created a program called Saluton.java
I navigate to the folder holding the class file using the command line under Windows 7 but when I issue the command java Saluton.class I get an error it cannot load or find the main class.
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Apr 9, 2015
What is the main advantage of nested class? Rather making one class reside inside other, can't we achieve all by making it two separate classes with its own individuality?
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Jan 7, 2014
I made a breakout like game that runs as a applet and now i wanted to make it run in a jframe so i wrote this
Java Code:
import java.applet.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class BrickBuster{
public static void main(String[] args){
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
JApplet BrickBuster = new JApplet();
frame.add(BrickBuster);
BrickBuster.init();
}
} mh_sh_highlight_all('java');
It compiles fine but whenever i try running it with the java command it says it couldnt find or load main class. also i have it save in a folder called BrickBuster so i called java BrickBusterBrickBuster.class
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Sep 23, 2014
I tried running my program on cmd but it produces the error "could not find or load main class" ...It compiles well but it just doesn't run. Here is my code:
package writedoc;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.IOException;
public class WriteDoc {
public static void main(String[] args) throws IOException {
String strDocument="grades.txt";
[Code] ....
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Mar 31, 2015
I am having an issue with this code. It says that I'm missing the main class.
import java.util.Random;
import java.util.Scanner;
public class Assignment5Hangman
{
public class GetData
{
private Scanner input;
public GetData()
[Code] .....
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Jun 24, 2014
I am trying to apply for a job in testing the following java application.I have received a tool written in Java and I need to run it with the command line:
java -classpath ./bin com.test.Main myinputfile.txt myoutputfile.txt sort....
Main class should receive 3 parameters: inputfile, outputfile, action.
Of course I have installed Java on my computer (Windows env.).
The problem is that I receive this error:"could not find or load main class com.test.Main"
I searched over the Internet and I saw that I need to specify the path where "Main" class is located.
Main class is located in my c: rachelFileManipulatornincomtest. What should I type exactly in order to run this Main class?
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Feb 13, 2015
I keep getting an error every time saying there is no main class ...
Loan
public class Loan implements LoanConstant{
public static int loanNumber;
public static String lastName;
public static int loanAmount;
public static int interestRate;
public static int term;
public int primRate;
[Code] ....
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Feb 26, 2015
I've been writing classes over and over for school. So I create a class outside of my main class. I create a new constructor and then create objects from my main class. I hope that makes sense. So i use methods in that class to work with the object. So I have an object name I've created <dot> method name. So I can create objects and then use methods from the class, but I'm wondering can I create a method in my main class and use it on that object? I don't understand how to do that.
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Aug 20, 2014
I have a frame which I want to load an applet inside it. Here is the code i have in my main method:
MyApplet myApplet = new MyApplet();
myApplet.init();
myApplet.start();
javax.swing.JFrame window = new javax.swing.JFrame("myApplet");
window.setContentPane(myApplet);
window.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
window.pack();
window.setVisible(true);
But I get an exception:
Quote
Exception in thread "main" java.lang.NullPointerException
at java.applet.Applet.getCodeBase(Applet.java:169)
at MyApplet.init(MyApplet.java:78)
at Intro.main(Intro.java:68)
Java Result: 1
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