Write Constructor Header - Invent Some Fields?
Oct 18, 2014
I have been given a question about a object creation resulting in the constructor of the Time class being called, and to write the constructor's header new Time(21, 39, 55);
So, this would be simply "public Time" and have to give meaningful names to formal parameters, which is what i don't understand. Is it just private int hours; etc? I have also been told to attempt to write the body of the constructor and will need to estimate how the code in the body will work and to invent some fields.
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Oct 19, 2014
Variable Fields are not holding information through constructor from user input so here's what I did instead.
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May 12, 2015
I'm trying to use in the constructor inserts from keyboard and then check whether any of the constructors fields remained empty. Let say my constructor is:
public SomeClass(String a, String b, String c)throws SomeClassException{
if (a == null || b == null || c == null) {throw new SomeClassException("Some message"); // here is the empty test
} //...
Thus I prepared method: insertConstruct() as follows:
public static String insertConstruct(){
String lettering = null;
Scanner sc = new Scanner(System.in);
lettering= sc.nextLine();
return lettering;
}
And during creating the new object in some main method I call:
// ...
ClassName obj1;
obj1 = new ClassName(insertConstruct(),insertConstruct(),insertConstruct());
//...
The problem is not with inserting data but with leaving the field empty. When I pass any field just with keyboards Enter, the empty test doesnt return me any message about it. While it works if I build object with the constructor like:
// ...
className obj1;
obj1 = new ClassName("word a",null,"word c");
//...
What might case this failure?
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Apr 26, 2015
I have an assignment to write a Payroll class that uses the following arrays as fields:
-employeeID - An array of seven integers to hold employee identification numbers. The array should be initialized with the following numbers: 5658845 4520125 7895122 8777541 8451277 1302850 7580489
-hours - An array of seven integers to hold the number of hours worked by each employee
-payRate - An array of seven doubles to hold each employees hourly pay rate
-wages - An array of seven doubles to hold each employees gross wages
The class should relate the data in each array through the subscripts. For example, the number in element 0 of the hours array should be the number of hours worked by the employee whose identification number is stored in element 0 of the employeeID array. That same employee's pay rate should be stored in element 0 of the payRate array. In addition to the appropriate accessor and mutator methods, the class should have a method that accepts an employee's identification number as an argument and returns the gross pay for that employee. Demonstrate the class in a complete program that displays each employee number and asks the user to enter that employee's hours and pay rate. It should then display each employee's identification number and gross wages. Input Validation: Do not accept negative values for hours or numbers less than 6.00 for pay rate.
I'm off to a great start, however I'm stumped on how to pass the payrate for each employee into the array, then grab that data in order to calculate the gross wage for each employee and store THAT in its own array. THEN I'll have to output that data to each employee.
Code is shown below.
import java.util.Scanner;
import java.text.DecimalFormat;
public class PayrollProgram {
public static void main(String[] args) {
Scanner userInput = new Scanner(System.in);
DecimalFormat df = new DecimalFormat("0.00");
[code]....
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Apr 6, 2014
I am looking to write a constructor (in a herited class) to initialize the name of a single piece and its orientation using values passed as parameters. If no value is given for guidance , it returns "none" , I do it in this way but i am not sure it is the right way:
public SimplePiece(String piece,String d){
super(piece);
if(d == null){
guidance = "none";
}else{
guidance = d;
}
}
What do you sugger me to do to get the right code .
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Dec 7, 2014
how to differ between fields that are not exists to fields that are null? because in my api when someone wants to delete a field he sends null instead of a value. and if he doesnt want to effect this feild he doesnt send it.
{
"a" : {"1","2"},
"b" : "hello"
}
{
"a" : null,
"b" : "hello"
}
{
"b" : "hello"
}
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Mar 3, 2013
how to get the first few hex symbols of a file in java, for example if i input a pdf into my coding i want my program to output, e.g "25 46 44 38" ....
I have been able to print out the hex of a whole file but not managed to set a maximum read limit so that my code only takes a certain amount of values ....
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Aug 14, 2013
How to set footer and header in word document/PDF using POI/open office. Using Java COde.!!
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Feb 2, 2015
I want to create a JTable which "Analysis","Date" and "Price" the names of columns in header. Here's a piece of my code :
String sql = "Select name, Price from analysis_tab where name ='" + idclicked + "'";
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");
Date date = new Date();
PreparedStatement preparestate = database.con.prepareStatement(sql);
ResultSet rs = preparestate.executeQuery();
So, the value of Analysis and Price were stored in my Data Base, and the Date get the value of the current day. How can i create this JTable and how can i set the value into it ?
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Apr 13, 2015
I am making a gui in which i read values from text file to JTable. But i want to define the column header as A,B,C,D,E,F,G,H,I. Now when i read, the values from text file are getting displayed in Jtable headers. How can i achieve the column header as A,B,C,D,E,F,G,H,I.
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class Bb extends JFrame {
[Code] ......
Text file from where it reads values: bbb.txt
1 2 1 1 2 1 1.83e-02 -1.0 3
1 1 1 1 1 1 1.89e-02 -1.0 2
0 0 0 0 0 0 0 0 0
1 2 1 1 2 1 1.83e-02 -1.0 3
1 1 1 1 1 1 1.83e-02 -1.0 2
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Feb 27, 2015
I'm new to Methods and do not really know how to write a method header. What would an appropriate header look like for the following instance? getFilename: This method takes no parameters. It asks the user for a filename. If that file exists, it returns the filename. If it does not exist, it asks the user for another filename. It continues to ask for filenames until the user gives the name of a file that exists.
Also, how would I make a return tag for this and call it into the main method.
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Apr 12, 2004
My code runs correctly when i run the clients one after another without using threads.I am getting this following error when i run my multi-threaded server. When a server accepts a client connection, ClientHandler is the thread that handles that client.Exception in thread "main"
java.io.StreamCorruptedException: invalid stream header at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:737) at java.io.ObjectInputStream.<init>(ObjectInputStream.java:253) at comm.DOMTransfer.<init>(DOMTransfer.java:25) at ClientHandler.<init>(ClientHandler.java:18) at GridInfo.main(GridInfo.java:34)This is where the error occurs:input = new ObjectInputStream(socket.getInputStream());
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Mar 5, 2015
I'm developing a SOAP client and have used wsimport to generate the classes, etc. and all is going pretty well, but the server requires several headers that I've been coding up manually, specifically wise:Security and o:Security blocks. While this is a valid approach, I think I'm probably doing things the hard way and I know .NET (SOAP being an MS standard originally) has some really powerful code to generate these headers. Does java have any similar counterparts? As an example, I'm writing code like the following:
SOAPElement token = securityElement.addChildElement("UsernameToken", "o");
token.addAttribute(soapFactory.createName("u:Id"), "UsernameToken-1");
SOAPElement userToken = token.addChildElement("Username", "o");
userToken.addTextNode(user);
[code]...
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Feb 26, 2015
I'm new to Methods and do not really know how to write a method header. What would an appropriate header look like for the following instance? getFilename: This method takes no parameters. It asks the user for a filename. If that file exists, it returns the filename. If it does not exist, it asks the user for another filename. It continues to ask for filenames until the user gives the name of a file that exists.
Also, how would I make a return tag for this and call it into the main method.
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Aug 21, 2014
Displaying the records in a table. I am looking for a group header to be placed above each printed table for its related category and subcategory, as well as, the no. of the records for each table to be shown at the top of the table.
The table contains columns for category, subcategory, name. ex:
Category Subcategory Name
CON Retail AAA
CON Wholesale BBB
SPEC Retail CCC
What I am looking for is the below layout:
Category/Subcategory (No. of records) –similar to a group header
Name – Country ..etc ----Table header
table records
Here is my code below:
<%
//Retrieve the values from the DB
while (rs.next()) {
category_name1=rs.getString("category_name");
subcategory_name1=rs.getString("subcategory_name");
[code]....
The problem in the above code is that it is showing the group headers category & sub category multiple times and the count is incorrect.
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Feb 26, 2014
Is it possible to allow users to resize columns in a JTable that has no header? I'd like the user to be able to grab the column lines on any of the data rows and be able to resize just like they can in the header.
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May 20, 2014
I'm doing a bit of styling in TableView. The result is quite nice but I can't make the left top corner round. This is the actual result:
[URL] ....
And this is the css :
.table-view {
-fx-background-color: transparent;
}
/*HEADER */
.table-view .column-header{
[Code] .....
I would also like the top left corner was round.
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May 23, 2014
I am facing an issue with the TableView in Java FX 8.
I am having a TableView created with data with scrollbars automatically added in when the Window is minimized.
I moved the horizontal scrollbar to right and then maximized the window to full.
After this the column headers remained no longer aligned with the content. When I click on any column header then the header aligns with the content.
The Issue is replicable also in case when a vertical scrollbar gets automatically added to a table view with preloaded data...
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Jul 5, 2014
I have a column of my TableView that just shows row numbers, and I would like to style the cells in that column so that they appears just like a column header (so the same styling as the headers use). I presume there is some simple way to do this by tapping into the right style class, but I am not sure which one.
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Apr 14, 2015
I am using the JavaFX dialogs. I have made a dialog as follows:
Alert d = new Alert(AlertType.CONFIRMATION);
d.setTitle(Resources.R(Resources.DELETE_DATA_SOURCE));
d.setHeaderText(...);
I want to make part of the header text bold -- I want a message like "Really delete X" where X is in bold.
Is there any way to do this with a dialog (other than rolling my own?).
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Apr 24, 2014
I will be developing a change and would like to know how can i parse a mail header in OBPM using java.
I want to get the message id, date and time the email recieved and email size.
Our code is already fetching the attachment of the email using the following syntax.
mailAttachments = mail.attachments;
I tried creating a variable like mailHeaders = mail.headers, would you know how can i get the details i want by parsing the variable? so far I wasn't able to check what mail.headers return as i'm currently having issues running our code locally due to DB connections.
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Mar 20, 2014
I know when including remember me token in request header, it will contain expiry date. does this mean the token generated must be able to be reversed back to it's original string?
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Jan 21, 2015
I'm working on a spreadsheet-like table and I was able to set it so that it would highlight the first cell in the relevant row(titled 1,2,3.. etc) when a cell is clicked. (Just like in MS Excel - preview attached) Now I want to do the same to the column header(i.e. A,B,C,D....etc) . How can I do it?
private void formWindowOpened(java.awt.event.WindowEvent evt) {
setLocationRelativeTo(null);
int rowNum = sheet.getRowCount();
for(int i=0; i<rowNum; i++){
sheet.setValueAt(i+1, i, 0);
[Code] ......
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May 14, 2014
I'm trying to create a table where the Header is a custom object.
The custom object would be something along the lines of
public MyColumnObject
{
String myLabel;
ArrayList dataForDropdowns;
int defaultColumnIndex;
int modifiedColumnIndex;
String tooltip;
}
This is simpler then what I want to do, but it's the basic concept. I want the column header to render the myLabel for the visual (at least at first). I want this render to be applied to however many columns I have, which will differ from table to table, but I always want the column header of each column to be of type myColumnObject.
I thought somethinglike this would work, but I'm getting java.lang.ClassCastException: java.lang.String cannot be cast to myColumnObject which makes sense, but I thought that I would be getting back my object.
p.s. I re-labeled all my code from my actual project, so if something looks off, it was probably just the re labeling.
public NewTestTable(MyColumnObjects[] fields)
{
setModel(new TestObjectTableModel(
new Object [][] {
},
fields
) {
private static final long serialVersionUID = 1L;
public boolean isCellEditable(int rowIndex, int columnIndex) {
[Code]...
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Feb 7, 2015
In my book for learning java, one of the questions asks us to create a method header named convertTOKM that takes an int parameter, which is the number of miles, and returns a double value for the converted value in kilometers. I made one, but wanted to know if I was right in any way.
Here it is:public double convertTOKM(int miles, double kilometers){
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May 20, 2014
is possibile to change the color of the sorting arrow that appears in the columns of the Table View by css? My attempts have failed and I have not found any documentation, nor is there any reference in the Modena css.
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