Objects Being Passed As Parameters
Aug 7, 2014
If I have a method that takes an ArrayList of a class called Piece and it uses the setPosition() method from Piece. It is changing the value of the array that I passed in, but I want the ArrayList to stay the same outside of the method. Is there any way I can change only the values on the inside of the method, but keep the same position values outside the method?Here is an example.
Piece class
Java Code: public class Piece {
private int xCoor;
private int yCoor;
[code]....
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Mar 31, 2014
I tried to Google, but was not able to find anything relevant.
I have a sql query where in I am using preparedStatement which goes something like :
select * from test where parameters in ( ?,?,?,?,?,?,?,?,?,?,?,?,?);
Is there a limit on how many "?" characters i.e. parameters can be there in this query?
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Sep 12, 2014
I have a webform on JSP page which has several parameters(strings and integers) values and a file to be uploaded to the server through a servlet. It is strange to see that i'm able to upload the file on to the server but not able to get the rest of the parameters in the servlet using request.getParameter("someString") .
<form method="POST" enctype="multipart/form-data" action="/cassino/uploadFile" >
<fieldset>
<div class="form-group">
<label >*ID riparazione</label>
<input type="text" name="idRiparazione" />
[Code] ....
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Feb 3, 2014
eg: "Sourdough".toUpperCase();
I guess this is actually a 2-part question:
- How does this work? (nothing seems to be passed through the parameter, so how is it that the value or variable is manipulated in this fashion?)
- How would I create a method that does something similar? (ie. adjusting a variable without having it passed through the parameters)
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Oct 20, 2014
The only problem I am having is I cannot get my string plainText to go through the encode and prepareString methods.
Is there something in my methods that is wrong, or is it the way that I am calling them?
What is happening is if I enter "this is a test" as a plainText I am getting the samething back with no changes.
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Sep 29, 2014
I have this class:
package model;
import java.awt.Color;
import shapes.Oval;
import shapes.Rectangle;
import shapes.Shape;
import java.awt.Container;
import java.lang.reflect.Array;
[Code] .....
And as it is now, the values are not being passed into the shapeArray array. If I "hard code" two shapes into the array in this class, everything works fine later on, but I do not manage to pass values into the array from the createShape() method. I tried several approaches, nothing works.
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Apr 11, 2014
I'm having some trouble figuring out how to change the value of a variable that is passed into a class. I've tried just changing the variable, I've tried changing it by using the this.variable command, and I've even tried calling the setter class from within the class to change it, but it's still not working right. The first class is the one with Main in it and I just feed it some dummy data:
public class ExamConverter {
public static void main(String[] args) {
// TODO Auto-generated method stub
Age testAge = new Age();
[Code] .....
This is the other class to calculate the age the way we do it on psych tests - it might not be mathematically accurate, but it's what all the tables and such for raw to scaled score conversion are based on, so the math needs to be the same as opposed to "accurate" because of some months having 30 or 31 days, etc.
public class Age {
//==================Properties==================
// Variables for the test date and client date of birth
private int TestMonth;
private int TestDay;
private int TestYear;
private int ClientMonth;
private int ClientDay;
private int ClientYear;
[Code] ......
Based on this dummy data, the output is:
Test: 5/4/2014
DOB: 5/5/1971
Age Years: 43 Months: 0 Days: 0
However, it should be:
Test: 5/4/2014
DOB: 5/5/1971
Age Years: 42 Months: 11 Days: 29
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Apr 22, 2015
I am writing a simple program in Java, where I call a method and pass some variables (namely, min and max) as arguments. This method is recursive, so the same arguments are again passed on in each recursive call.
I need to update these variables in recursive calls so that when the calling method uses them, it uses updated values. As it might sound confusing, here is sample code :
// Function 1.
void func1() {
//Call func2.
func2 (int hd, int min, int max, Map<String, String> map);
//Other stuff.
}
// Function 2.
[code]....
As you can see, min and max are updated after each recursive call returns, based on conditions. However, these changes aren't reflected in original min and max, which were used by func1 while calling func2. As far as I know, this happens due to call by value mechanism being used by Java while passing arguments. If I declare min and max as instance variables in the class, my problem is solved. But, I want to know whether there's any other way to update these variables so that changes in original min and max are reflected. Yes, I can return them as an array of 2 elements each time while returning, but it didn't seem a good solution to me.
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May 29, 2014
I have an html form with 200 input fields of type text. The first input field contains the name of a book author and the remaining 199 fields hold each a title of a book that he or she has written. I also have a servlet that processes the form data and sends it to a file. The entered data is restricted to a combination of the characters "a...z A...Z". how do i go about with creating my html page. The input fields are just too many, how to retrieve the 200 values in servlet.
<html>
<head>
<script>
var k;
function testField(Expression){
k=1;
var str1="abcdefghijklmnopqrstuvwxyz ";
var sor=Expression;
[code]....
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Oct 11, 2014
my arraylist is declared in my main method. A string that i will be calling on is declared in my main method as well. The arraylist and string is passed to a method outside the main. I am to search for the beginning of a string and end of the string, remove those items. Then i am to pass the string with the removed items to arraylist that is called in my main with an enhanced for loop. The for loop then displays what is needed from the string and the method i created. I will posting an example of my main and method that is used in my program.
public class ExampleUrl {
public static void main(String[] args) throws MalformedURLException, IOException {
ArrayList<String> urlList = new ArrayList();
String url = "";
[Code].....
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Sep 30, 2014
How are methods invoked on the `bird` parameter?
next.xhtml:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
[Code] ....
`MyQueueBean` is intended to give out a bird once only, to exactly one end-user. Because it's application scoped, and not session scoped, getting attributes directly from the bean would give inconsistent results.
The birds application is from Facelets Essentials Guide to JavaServer Faces View Definition Framework: [URL] ....
how is the variable passed to the file? Once it's passed, how is it referenced?
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Feb 7, 2015
How does the Scanner goes through the String which is passed to it as a parameter. For example, String input = "222 dddd 222 ddd22" is passed to the method and here's the code:
Java Code:
public static void sum(String anything)
{
Scanner input = new Scanner(anything)
while(input.hasNext())
{
if(input.hasNextDouble())
{
double nextNumber = inut.nextDouble();
sum += nextNumber
}
......
......
} mh_sh_highlight_all('java');
{
So, how does Scanner calculates a passed String? I just want to know the way it calculates/reads.
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Sep 18, 2014
public static void main(String[] args) {
boolean t=false;
long cuTime = System.currentTimeMillis()
while(t==false) {
System.out.println(cuTime);
long g=cuTime+2000;
[Code] ....
I tried this and it includes a while loop as the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop
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Sep 18, 2014
public static void main(String[] args) {
boolean t=false;
long cuTime = System.currentTimeMillis();
while(t==false) {
System.out.println(cuTime);
long g=cuTime+2000;
[Code] ....
I tried this and it includes a while loop. therefor the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop...
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Sep 18, 2014
public static void main(String[] args)
{
boolean t=false;
long cuTime = System.currentTimeMillis();
while(t==false)
{
System.out.println(cuTime);
[code].....
I tried this and it includes a while loop as the whole program has to wait until this while loop executes. So the entire program slows down. Is there any way to do this without a while loop
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Dec 8, 2014
i need to write a method, that passes in an arraylist and a keyword,and display the name of all the people in the arrayList whose name contain the keyword (irrespective of uppercase or lowercase). how to write such a method ??
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Oct 29, 2014
I'm working on a method that would parse the value of the array of object that I passed through a parameter. I would like to ask if making Object as a parameter is doable. Let's say I have a class Student and Teacher. I created a class the would handle the sched and name it class Schedule and extend this class to the Student and Teacher. Now I want to have a function that will accept an array of Schedule from either Student and Teacher, what ever object I will pass in the parameter. I know its easy to just make a method with a separate parameter of my classes but im looking for a more dynamic code.
class Student extends Schedule{
//variables here for student
}
[code]
class Teacher extends Schedule{
//variables here for teacher
}
[/code]
private void parseObject(ArrayList<Object> objct){
Schedule temp = objct.get(0);
//there is no error in this part
}
Now when i will try to use the function and pass a data, it will not accept since my parameter should be an array of object. How would I twist dis one?
ArrayList<Student> temp_student = new Array....
parseObject(temp_student); // it will not accept my parameter, how would i make it as an object
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Feb 19, 2011
I thought static methods could never use instance variables, because they wouldn't know which instance to look at.
From Head First Java, p. 284: "A static method is not associated with a particular instance - only the class - so it cannot access any instance variable values of its class. It wouldn't know which instance's values to use."
Now I was answering some mock exam questions from Cameron McKenzie's SCJA book, and I don't understand one of the options. On page 205, the last question has an option that says: "Instance variables ... are not visible in static methods, unless passed in as arguments." This option is supposed to be correct. Now... how does that work?
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Jan 27, 2015
I have an endpoint that will determine if a passed in integer is prime or not. Should the request to this endpoint be GET or POST? Right now, I'm thinking it should be GET since it doesn't do anything to any resource.
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Aug 27, 2014
For the below program what are the default values passed by the JVM in order to call main() method
class program
{
public static void main(String[] args)
{
System.out.println(args[0]);
System.out.println(args[1]);
}
}
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Jan 20, 2015
I created the WSDL first in RSA and then created the java bean skelaton from the WSDL. There are a couple of dateTime fields in the WSDL that are created as GregorianCalendar objects.
When I test with SOAPui and the date fields are passed correctly, everything works great. But when there is an invalid date format or anything else in the SOAP request, instead of returning a Conversion exception or some other validation exception, the field is passed as a null to the request object in the SOAP IMPL. Should't this return an exception?
Sample requests inputs:
<endTimeStamp>2014-01-28T01:30:14.474Z</endTimeStamp> - Date
<endTimeStamp>06-FEB-14 01.51.00.000000000 AM</endTimeStamp> - Null
<endTimeStamp>Any other string be it a date or not.</endTimeStamp> - Null
[Code].....
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Oct 21, 2014
A University offers a course that prepares students for the county licensing exam for real estate brokers. Last year, twenty students who completed this course took the exam. The university wants to know how well its students did an exam. You have been asked to write a program to summarize the results. You have been given a list of these 20 students. Next to each is written a1 if the student passed the exam or a2 if the student failed the exam.Your program should analyze the results as follows:
i.Input each test result (i.e., a1 or a2). Display the message Enter result on the screen each time the program requests another test result.
ii.Count the number of test results of each type.
iii.Display a summary of the test results, indicating the number of students who passed and the number who failed.
iv.If more than 15 students passed the exam, output message, Bonus to the instructor
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Jul 27, 2014
I am currently working on a project where I need to return data from a database over RMI to a client who requests it. Some of the fields in the Data Object can not be seen by the client so I need to create another object to send over the network instead. The method I use is this...
public static SerializableObject createSerializableObjectFromDataObject(DataObject dataObject){
SerializableObject serializableObject = new SerializableObject();
serializableObject.setField(dataObject.getField());
serializableObject.setAnotherField(dataObject.getAnotherField());
return serializableObject;
}
Is there a better way of doing this? I am creating many subclasses DataObject which all require this static method to be implemented and I can't push it into the superclass because each one needs custom behaviour.
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Mar 12, 2015
I am trying to make the variables that will be taken in from a type='text' box in HTML in NetBeans available to the other servlets as well as store and display the latest value passed into these boxes on the servlet page when the submit button is clicked or display null if the box has not yet received a value. However, I do not understand how to do this and do not understand as to why my current output is always null?
i) Is ServletContext().getAttribute("name of my textbox") really the way to pass the attributes to all servlets?
ii) Is ServletContext() passed in the service request?
iii) How to store the latest value passed into the submit box?
Here is my code
index.html
<html>
<head>
<title>Lab One</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
First Name: <input type="text" name="firstName">
[code]....
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Apr 8, 2014
java com.brainbench.TestCommandLine -p Parameter1 Parameter2 Parameter3 Parameter4 ..
If the user enters the command line shown above, how many elements are contained in the array which is passed to "public static void main(String args[])" in TestCommandLine?
Choice 1 Four
Choice 2 Five
Choice 3 Six
Choice 4 Seven
Choice 5 Nine
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Aug 25, 2014
i would like from my bean to redirect after an operation is completed to the page faces/test.xhtml?id=2? Is there a way to do this?
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