I've tried to pass an initialization list {...} to a constructor and it didn't work.
When I instead declared it in a method local variable (int[]) it worked flawlessly.
Why is that?
public class ...
|
How can i pass an entire array to a method?
private void PassArray(){
String[] arrayw = new String[4];
//populate array
PrintA(arrayw[]);
}
private void PrintA(String[] a){
//do whatever with array here
}
how do i ... |
I have not been able to find a proper answer on any forums about this.
But how exactly do I pass an array to a class constructor?
public class TestArray {
...
|
I have a method in C++ that takes an array of doubles as an argument. I'm calling this method from Java and need to pass an array of doubles. ... |
The following is a contrived example I just made up to help me understand the inner workings of java.
public class Main {
public static void main(String[] args) {
...
|
I need to pass pointer of an array of IplImage
(IplImage extends CvArray extends Structure implements cloneable) to a function The code in C is as follows:
cvCalcEigenObjects(
nTrainFaces,
(void*)faceImgArr,
...
|
I need to call a java function from clojure, which takes a float array as a parameter. How would I do this in clojure?
I tried
(classname/function [0.1f 0.2f]) - but this doesn't ... |
|
I'm trying to pass ArrayBuffer to Java applet, but cannot guess how to do it. It's pretty easy to handle standard JS arrays and they work fine for Sun's plugin (not ... |
I am having a problem in this code. what i am trying to do is read a file and store a studentID and score into an array of scores into the ... |
In ruby it would look like
myfunction (["element1", "element2", "element3"],"other argument")
Can I do the same in java? One line only.
I know I can use
String[] ...
|
Suppose I have an int-array and I want to modify it. I know that I cannot assign a new array to array passed as parameter:
public static void main(String[] args)
{
...
|
<%
//Retrieving the Server list from dispatcher
Collection<Server> svr = (Collection<Server>)request.getAttribute("stuff");
ArrayList<String> serverIds = new ArrayList<String>();
for(Server i : ...
|
Wen I have this code:
import java.util.Scanner;
import java.util.Arrays;
public class Ex02 {
/**
...
|
I'm trying to convert a complex Java applet to JavaScript. The applet does all sorts of magic with communicating on a TCP socket, which I will need to emulate in JavaScript. ... |
|
this is my code. i am facing a problem whereby i want to pass in the results that i got from the file and put it in array to be listed out. the problem is most samples i got from the book and internet is to tell the which array has which value. now i want to do a checking whereby, ... |
Can you please solve this one: Question Number 4: > > Create a TestClass with a main method and create two > non-static methods m1 and m2 which don't return > anything. m1 does not take any arguments but m2 takes > two arguments of a character and one of array. > Initialize an array with two characters in m1 method. ... |
There is a few ways of doing this... 1. You could make the array a field variable (ex. public int[] myarray). It could be accessed by another class using MyClassInstance.myarray (where MyClassInstance is an instance of the class that contains the array) 2. You could make the array a private variable and use get and set methods to access it from ... |
I need to pass an array as an argument to a method, and I'm not sure how to code it. Does it go something like this: private void methodName (array arrayName); Example: private void hungryMonster (array slimyThings); Do I need to specify the data type of the array in the argument to the method? Or is this not a concern since ... |
Varargs always give problems with Object and subclasses. An Integer[] is both an Object[] and an Object. In these cases, it's always wise to cast to either Object[] (if you want the elements to be the actual varargs arguments) or to Object (if you want the array to be one single varargs argument). |
Java passes all arguments by value. This means that the arr variable in your initArray method will refer to the same array that you pass to it in your main method, but it is a different variable from the arr variable in your main method. You essentially pass the value null to it, then you assign a new array to arr ... |
//Service class public class Test{ private char userAnswers; private char[] correctAnswers = {'T', 'F', 'F', 'T', 'T', 'F', 'T', 'T', 'T', 'F'} ; private String[] questions = new String[10]; public String[] getQuestions(int count){ questions[0] = "Is this program working?"; //insert 9 more questions to be completed return questions; } // minus the two following methods we can compile... //determine what is ... |
Hello everyone This is my first atempt at the db forums . Hoping to get some answers from some one of you guys/gals who have had this problem or knows how to handle this. Here's my problem. I have a stored proc which expects a data type as follows. FUNCTION get_info( end_dt DATE DEFAULT NULL, num_id kdt_num_table) RETURN VARCHAR2; kdt_num_table is ... |
Once again, I find myself needing assistance. Please keep in mind that I am also an Over the Road Trucker, who is learning basic Java. :) Basic VB was pretty easy, but this is a little tougher challenge. I am getting an error on line 17. Arrays.java:17: cannot find symbol symbol : class Prices location: class Arrays Prices price = new ... |
|
Hello there, I am building a program, and very close to its final state. My problem is the input. My basic input is of the type string name, double[], double[],double[], int x I know that main takes only a string array as input and that I have to cast the relevant elements with double.parsedouble(). My problem is, how to pass the ... |
I'm new to java, and I'm creating a program that takes an array with 10 integers and then sorts them into three new arrays of even, odd, and negative numbers, then prints out the three new arrays. I have code written that sorts the array and prints out one by one each numbers and declares if its even, odd, or negative. ... |
i am having issues. i don't know what to do or what is wrong. any advice? Java Code: package people; import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; /** * * @author Jarrod Dowell */ public class Main { final static int LIMIT = 20; public static void main(String[] args) throws FileNotFoundException{ final String FILENAME = "applicants.txt"; File inputFile = new File(FILENAME); if(inputFile.exists()){ ... |
Passing 2 dementional array to a new class Hello everyone, first post =D Okay, so I am writing a program (which is an assignment for school) that reads a maze from an input file (or creates a random maze of any size) and then searches that maze and prints out the correct path (if there is one) to traverse ... |
Hi, i am struggling with this assignment . I have to create a retierment calculator that keep track of x amount of years in x.length of array for each index in the array it keeps the info. and the index after the one before uses the results of the one before as a starting point so i have a constructor and ... |
import java.util.Arrays; public class CardDeckApp{ public static void main(String[] Args){ CardsLoad(); cardPrint(); } public static void CardsLoad(){ int[] cardNumber=new int[15]; for(int y=1;y<14;y++){ cardNumber[y]=y; System.out.print(cardNumber[y]); //just checking if it loaded } } public static void cardPrint(){ int[] cardNumber=new int[15]; String[] suits={"H", "D", "C", "S"}; for(int p=0;p<4;p++){ for(int y=1;y<14;y++){ System.out.print(suits[p]+" "+cardNumber[y]+","); } } } } |
hi, I have a problem with passing arrays to a method in another class. class new { public static int i,j; Integer [] x= new Integer (i); Integer [] y= new Integer (j); public void new( int i, int j, int [] x, int [] y) { this.i=i, this.j=j; //manupulation with array } public class sample { psvm () { int ... |
|
I'm somewhat new to java, and I'm taking classes but I'm really starting to take an interest in it, so expect more questions from me! But a problem I got for my current class really has me stumped. We're using eclipse I do not understand how to import a file into eclipse and have it read, and for that matter, what ... |
I assume this will be in a jsp page. You can pass the individual values to a jsp page as parameters, then retrieve them using the request.getParameter() method and then put the values in a Java array. Another option would be to build up a String out of all the values, using some sort of delimeter to seperate them, then retrieve ... |
mcaha wrote: I have searched this forum and read about "Java passing arguments" and i understand that parameters are passed by values and objects by reference - array being an object. But not sure how to make the above question work. You've fundamentally misunderstood the terminology here. Java passes everything by value. Remember that you never have direct access to objects ... |
thanks jos, i am sorry i had misunderstood the concept... but thanks again for the explanation. No need to apologise; calling a pointer a 'reference' has caused more confusion than just this, i.e. some folks new to Java assume that Java supports call by reference (which it doesn't) and by taking away the explicit '&', '*', '.' and '->' operators most ... |
I don't know much about applets or the AWT class from which they derive. I have done all my GUI coding in Swing and JApplets. But having said that, two things stick out: 1) I see that you are doing graphics in a method that does not override the Applet paint method. Isn't that incorrect? 2) Can't you add a Panel ... |
public void load() throws Exception { try { String parameter = getParameter("par1"); if (parameter != null) par1 = Integer.parseInt(parameter); else k++; URL mysite = new URL("http://www.xxxxxxxxxxxxxx.html"); URLConnection ms = mysite.openConnection(); BufferedReader in = new BufferedReader( new InputStreamReader( ms.getInputStream())); while ((inputLine = in.readLine()) != null) { arr[m] = inputLine; m++; repaint(); } in.close(); } catch (MalformedURLException e) { k++; } } public ... |
1) Don't post the same question multiple times. This is considered very poor forum etiquette. It's frustrating for a person to volunteer their time to try to answer your question only to find out later that it was already answered in another thread. Stick to one thread. http://forum.java.sun.com/thread.jspa?threadID=5190406&messageID=9745648#9745648 2) Use code tags. You were asked to do this previously. No one ... |
|
|
|
You don't pass things to classes. You pass them to constructors or methods of a class or instance of one. If you do this, for example: System.out.println("Hello world"); you are passing a String argument to the println method. You can similarly pass your array to a method of some class, if that method accepts an array as a parameter. P.S. You're ... |
Another thing you could do would be to make checkSubjectStudied a method of Student. Then you wouldn't need to return the subjects array. It would be a field of the same class. For that matter you wouldn't need the getFName and getLName methods either. By the way, in one of your if statements you're trying to use & to compare an ... |
Thank you for the clarification. I got confused and thought the arraylist was an array just a different way to present it. I know that trying to sort manufacture was wrong but I could not cast on anything else. Thank you so much for your post it has became clearer to me. |
If this is an elective, I'd advise you to drop the course and just teach yourself from a book. If this is a required course...then again I'd advise you to teach yourself from a book, and tune you professor out, but I wish you good luck, since your teacher might grade you unfairly (e.g., take away points for doing something that's ... |
In the first line of the for loop, it says it is a type mismatch: cannot convert from int to Coin[] and vice-versa. Also, there is this error: "The operator < is undefined for the argument type(s) Coin[], int. In the second line of the for loop, there are two type mismatches: cannot convert from Coin[] to Coin and cannot convert ... |
= ... 3) I don't see a reason why you would want to pass an array into the method in the first place. If it's initialized to zero and you don't do anything with the array content initial values, it would seem to me that the best thing would be to create a new array in the method and simply return ... |
In the below method I am trying to return an array. The compiler gives me one error: '.class' expected. I am not sure if I am writing the 'return' statement correctly and not really sure of another way to code it. Below is a portion of the code and I can post all of it if need be but the other ... |
|
} } //here just im printing the elements from arraylist. for (int j = 0; j < alist.size(); j++) { System.out.println(alist.get(j)); if (bufferedReader != null) { bufferedReader.close(); } } //converting arraylist to array; String[] strArray = new String[50]; alist.toArray(strArray); //passing array as argument Area area1 = new Area(strArray); area1.calc(); area1.print(); } } |
|
|
|
I have been studying Java for some time now, but for some reason the way one should pass a multi-dimensional array is something I still struggle to understand clearly in my head. Would someone mind showing me a quick example of how to create a 2x2 float type array in a main class and then pass that array into a method ... |
|
|
|
|
I currently have a string array in one class and am looking to pass it into another class. I am using: NewClass variable = new NewClass( "here is where i need to pass my array"); Also, just wondering exactly how I would read it in. I assume it would be something like: public NewClass(newArray[ ]) I've checked and my array has ... |
I have a 'C' function with an interface: float* fn(float in, float* in2) I have a 'C' program which calls the function containing a function: JNIEXPORT jfloatArray JNICALL Java_mainClass_t3( JNIEnv *env, jobject obj, jfloat f1, jfloatArray f2) { return (fn(f1,f2)); } In my java program, I call the function t3 as follows: float[] arr1 = new float[10]; /* initialise array arr1 ... |
HELP!! Plz excuse any ignorance. Am a noob and have created an array within my class. I then try to alter those array values from inside one of the classes methods. When I try to access the new values from the class array, they don't exist. I think it's a duration/scope issue and am struggling to get around it. This is ... |
Nooo... I can't use singleton There are many errors, and I want to know PLEASE... there are other form to give a variable to parent class? I don't use hierarchy, because one class is a frame (principal frame of the application) and the other class is a jDialog. The problem is this: JDialog create a file array and I need ... |
it's because i am using db4o as my database. that's why i import all those packages. i want to make retrieve data work. i can just display out the results in eclipse. but now i want to put it in array so that i could pass in to jsp to display the end results after i have get it from the ... |
|
Hi, i want to pass the stirng value into date array. how is it possible... eg.. i am getting the value as sting i.e String str = "10/31/2006"; now i want to store this value into date array.. i.e new Date[]{date}; i want to store that string as date..... plz help me |
|
I am having a problem with a project for school. We are to take data from an array we create in our driver, pass it to the method, do something to it and return the data to the driver. Well I keep getting the same error message and after looking at dozen's of sites it appears that I think I have ... |
|