Another assignment, return values
I know I have poset another unresolved problem, but that's bigger one, so I think I'll bide my time with that one. The issues with it was simply more substainsial than I thought so I guess I'm not quite ready for it... I have another assignment though, smaller one:
I have to return values form an array that is greater than some k value, and what I'm accustomed to do, is to simply run through the array with a for-loop and if one element is greater than k, then print it out...
However this assignment explicitly says that I should hand the array and the k value over to a method with int as return type, and that confuses me because I thought java couldn't return more than one thing at a time.
class Main{
public static void main( String[] args ){
int k = -1;
int[] array = { -3, 2, -7, 5, 4, -1, 0, -6 }
A link = new A();
System.out.print("The numbers greater than k are: "
+ link.greaterNumbers( array, k );
class A{
public int greaterNumbers( int[] data, int k ){
* Here I would normally just change the return type to void,
* and print the numbers out in a for-loop, but I can't do that here.
* So I'm unsure what to do.
return something;
}Edited by: kreaturen on Aug 11, 2011 5:45 PM
Edited by: kreaturen on Aug 11, 2011 5:49 PM
Edited by: kreaturen on Aug 11, 2011 6:08 PM
kreaturen wrote:
...the return type is specified as int......but yet...
I have to return values form an array So, even though you're new to Java you should be able to apply some common sense and reasoning here.
On the one hand, you say you have to return an int. On the other hand, you say you have to return values. Now, even though you're a beginner, I would think you would recognize that "an int" is a single number, while "values" can encompass multiple numbers.
You understand that much, right?
Now my question is, how do you reconcile that discrepancy? Was one or the other just a typo? Or did you on the one hand think you have to return "an int" and on the other hand think you have to return multiple values, and just didn't notice the contradiction? Or do you just not understand the instructions? (Perhaps you're supposed to return an int representing how many values meet the criteria, rather than returning the values themselves?)
Now you can see that before you do anything else, you must clarify the above, so that you are sure exactly what you're supposed to return and you can communicate clearly to the forum exactly what that requirement is.
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Edited by: crackleOK on Jul 21, 2009 4:46 AMcrackleOK wrote:
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What I am looking for is to have another output-text box on the search page which will show the Name corresponding the above selected ID.
Can I have more than 1 returnActionListener for the SelectInputText to return more than one value??
OR should I use something else?
Regards,
ZohebBut Frank, the SelectInputText automatically displays the returnEvent.getReturnValue() and I can't do anything about it. My ReturnListener method parses values from the hash table and assigns them to multiple fields on the screen. But the SelectInputText overwrites the value that I assign and displays the entire hashmap as the value of that field. The actual value displayed in the SelectInputText item ends up looking like this:
{KEY1=Key1Value, KEY2=Key2Value}
My ReturnListener method assigns the value Key2Value to field #2 (which is an InputText, not a SelectInputText) and it displays correctly.
My ReturnListener method assigns the value Key1Value to field #1 (which is the SelectInputText that launched the dialog) but instead of displaying Key1Value in the field, the page displays the entire hashmap in that field.
How can I force the SelectInputText to display "Key1Value" instead of "{KEY1=Key1Value, KEY2=Key2Value}"? -
Getter/setter methods -- how do I use the return values
I'm just learning Java, and I haven't been to this site since the end of July, I think. I have a question regarding getter and setter methods. I switched to the book Head First Java after a poster here recommended it. I'm only about a hundred pages into the book, so the code I'm submitting here reflects that. It's the beginnings of a program I'd eventually like to complete that will take the entered information of my CD's and alphabetize them according to whatever criteria I (or any user for that matter) choose. I realize that this is just the very beginning, and I don't expect to have the complete program completed any time soon -- it's my long term goal, but I thought I could take what I'm learning in the book and put it to practical use as I go along (or at lest try to).
Yes I could have this already done it Excel, but where's the fun and challenge in that? :) Here's the code:
// This program allows the user to enter CD information - Artist name, album title, and year of release -- and then organizes it according the the user's choice according to the user's criteria -- either by artist name, then title, then year of release, or by any other order according to the user's choice.
//First, the class CDList is created, along with the necessary variables.
class CDList{
private String artistName;//only one string for the artist name -- including spaces.
private String albumTitle;//only one string the title name -- including spaces.
private int yearOfRelease;
private String recordLabel;
public void setArtistName(String artist){
artistName = artist;
public void setAlbumTitle(String album){
albumTitle = album;
public void setYearOfRelease(int yor){
yearOfRelease = yor;
public void setLabel(String label){
recordLabel = label;
public String getArtistName(){
return artistName;
public String getAlbumTitle(){
return albumTitle;
public int getYearOfRelease(){
return yearOfRelease;
public String getLabel(){
return recordLabel;
void printout () {
System.out.println ("Artist Name: " + getArtistName());
System.out.println ("Album Title: " + getAlbumTitle());
System.out.println ("Year of Release: " + getYearOfRelease());
System.out.println ("Record Label: " + getLabel());
System.out.println ();
import static java.lang.System.out;
import java.util.Scanner;
class CDListTestDrive {
public static void main( String[] args ) {
Scanner s=new Scanner(System.in);
CDList[] Record = new CDList[4];
int x=0;
while (x<4) {
Record[x]=new CDList();
out.println ("Artist Name: ");
String artist = s.nextLine();
Record[x].setArtistName(artist);
out.println ("Album Title: ");
String album = s.nextLine();
Record[x].setAlbumTitle(album);
out.println ("Year of Release: ");
int yor= s.nextInt();
s.nextLine();
Record[x].setYearOfRelease(yor);
out.println ("Record Label: ");
String label = s.nextLine();
Record[x].setLabel(label);
System.out.println();
x=x+1;//moves to next CDList object;
x=0;
while (x<4) {
Record[x].getArtistName();
Record[x].getAlbumTitle();
Record[x].getYearOfRelease();
Record[x].getLabel();
Record[x].printout();
x=x+1;
out.println("Enter a Record Number: ");
x=s.nextInt();
x=x-1;
Record[x].getArtistName();
Record[x].getAlbumTitle();
Record[x].getYearOfRelease();
Record[x].getLabel();
Record[x].printout();
}//end main
}//end class First, I'd like to ask anyone out there to see if I could have written this any more efficiently, with the understanding that I'm only one hundred pages into the book, and I've only gotten as far as getter and setter methods, instance variables, objects and methods. The scanner feature I got from another book, but I abandoned it in favor of HFJ.
Secondly --
I'm confused about getter and setter methods -- I'd like someone to explain to me what they are used for exactly and the difference between the two. I have a general idea, that getters get a result from the method and setters set or maybe assign a value to variable. I submitted this code on another site, and one of the responders told me I wasn't using the returned values from the getter methods (he also told me about using a constructor method, but I haven't got that far in the book yet.). The program compiles and runs fine, but I can't seem to figure out how I'm not using the returned values from the getter methods. Please help and if you can explain in 'beginners terms,' with any code examples you think are appropriate. It will be greatly appreciated.
By the way, I'm not a professional programmer -- I'm learning Java because of the intellectual exercise and the fun of it. So please keep that in mind as well.
Edited by: Straitsfan on Sep 29, 2009 2:03 PMStraitsfan wrote:
First, I'd like to ask anyone out there to see if I could have written this any more efficiently, with the understanding that I'm only one hundred pages into the book, and I've only gotten as far as getter and setter methods, instance variables, objects and methods. The scanner feature I got from another book, but I abandoned it in favor of HFJ.Yes, there is tons you could have done more efficiently. But this is something every new programmer goes through, and I will not spoil the fun. You see, in 3 to 6 months when you have learned much more Java, assuming you stick with it, you will look back at this and be like "what the hell was I thinking" and then realize just haw far you have come. So enjoy that moment and don't spoil it now by asking for what could have been better/ more efficient. If it works it works, just be happy it works.
Straitsfan wrote:
Secondly --
I'm confused about getter and setter methods -- I'd like someone to explain to me what they are used for exactly and the difference between the two. I have a general idea, that getters get a result from the method and setters set or maybe assign a value to variable. I submitted this code on another site, and one of the responders told me I wasn't using the returned values from the getter methods (he also told me about using a constructor method, but I haven't got that far in the book yet.). The program compiles and runs fine, but I can't seem to figure out how I'm not using the returned values from the getter methods. Please help and if you can explain in 'beginners terms,' with any code examples you think are appropriate. It will be greatly appreciated.
By the way, I'm not a professional programmer -- I'm learning Java because of the intellectual exercise and the fun of it. So please keep that in mind as well.First, if you posted this somewhere else you should link to that post, it is good you at least said you did, but doubleposting is considered very rude because what inevitably happens in many cases is the responses are weighed against each other. So you are basically setting anyone up who responds to the post for a trap that could make them look bad when you double post.
You are setting you getters and setters up right as far as I can tell. Which tells me that I think you grasp that a getter lets another class get the variables data, and a setter lets another class set the data. One thing, be sure to use the full variable name so you should have setRecordLabel() and getRecodLabel() as opposed to setLabel() and getLabel(). Think about what happens if you go back and add a label field to the CDList class, bad things the way you have it currently. Sometimes shortcuts are not your friend.
And yes, you are using the getters all wrong since you are not saving off what they return, frankly I am suprised it compiles. It works because you don't really need to use the getters where you have them since the CDList Record (should be lowercase R by the way) object already knows the data and uses it in the printout() method. Basically what you are doing in lines like:
Record[x].getArtistName();is asking for the ArtistName in Record[x] and then getting the name and just dropping it on the floor. You need to store it in something if you want to keep it, like:
String artistName = Record[x].getArtistName();See how that works?
Hope this helped, keep up the good learning and good luck.
JSG -
How to set the returned value of CFL in a matrix
dear all,
I got a matrix binded to a DataSource and two CFLs are in this matrix. The codes for handling AfterChooseFromList is as following. It works almost fine. But when a docoment containing more than two
rows in the matrix and I reselect the CFL cell values more than two times, an error occured sometimes, not everytime. The error message is "This entry already exists in the following tables @CYW_PRROW [Message 131-183]"
I have tried to find out what kind of situation to cause this error, but still in the mud.
Can anybody give me some suggestion? Thanks.
Public Sub OnAfterChooseFromList_Matrix(ByVal pVal As SAPbouiCOM.ItemEvent)
Dim ActionSuccess As Boolean = pVal.ActionSuccess
Dim oform As SAPbouiCOM.Form = SBO_Application.Forms.Item(pVal.FormUID)
Dim oitem As SAPbouiCOM.Item = oform.Items.Item("mtx_0")
Dim omatrix As SAPbouiCOM.Matrix = CType(oitem.Specific, SAPbouiCOM.Matrix)
Dim oDataTable As SAPbouiCOM.DataTable
oDataTable = pVal.SelectedObjects
Dim val As String
Try
val = oDataTable.GetValue(0, 0)
Catch ex As Exception
End Try
omatrix.GetLineData(pVal.Row)
oform.DataSources.DBDataSources.Item("@CYW_PRROW").Offset = pVal.Row - 1
If pVal.ColUID = "col_0" Then
Try
oform.DataSources.DBDataSources.Item("@CYW_PRROW").SetValue("U_PRItemCode", pVal.Row - 1, CStr(val))
Catch ex As Exception
SBO_Application.MessageBox(ex.Message)
End Try
Else
Try
oform.DataSources.DBDataSources.Item("@CYW_PRROW").SetValue("U_PRSupp", pVal.Row - 1, CStr(val))
Catch ex As Exception
SBO_Application.MessageBox(ex.Message)
End Try
End If
omatrix.SetLineData(pVal.Row)
If pVal.FormMode = "1" Then
oform.Mode = SAPbouiCOM.BoFormMode.fm_UPDATE_MODE
End If
End Sub
Another quesion, can I assign the returned value of CLF directly to the cell?Hello Chao-Yi Wu,
I don't have a real solution for you - just a few comments:
1. At
Try
val = oDataTable.GetValue(0, 0)
Catch ex As Exception
End Try
I would add
Try
if oDataTable Is Nothing Then Exit Sub ' If the User cancels the CFL
val = oDataTable.GetValue(0, 0)
Catch ex As Exception
End Try
2. At
If pVal.ColUID = "col_0" Then
I would make the branch by the pVal.ChooseFromListUID instead of the ColUID
and the 2nd not with "Else" but with "Else If ....."
3. It may work with EditText.String/Value of a cell but I never do that because of performance-reasons.
I always do it the same way as you in principle - I don't really know what the problem is.
4. Maybe some unique indexes on your table (although this should give an error at the update and not at CFL when "the unique-law is broken"...)?
Sorry - that's all for the moment.
Cheers,
Roland -
How to know that a method has been called and returning value of a method
Hi, everyone! I have two questions. One is about making judgment about whether a method has been called or not; another one is about how to return "String value+newline character+String value" with a return statement.
Here are the two original problems that I tried to solve.
Write a class definition of a class named 'Value' with the following:
a boolean instance variable named 'modified', initialized to false
an integer instance variable named 'val'
a constructor accepting a single paramter whose value is assigned to the instance variable 'val'
a method 'getVal' that returns the current value of the instance variable 'val'
a method 'setVal' that accepts a single parameter, assigns its value to 'val', and sets the 'modified' instance variable to true, and
a boolean method, 'wasModified' that returns true if setVal was ever called.
And I wrote my code this way:
public class Value
boolean modified=false;
int val;
public Value(int x)
{val=x;}
public int getVal()
{return val;}
public void setVal(int y)
val = y;
modified = true;
public boolean wasModified()
if(val==y&&modified==true)
return true;
}I tried to let the "wasModified" method know that the "setVal" has been called by writing:
if(val==y&&modified==true)
or
if(x.setVal(y))
I supposed that only when the "setVal" is called, the "modified" variable will be true(it's false by default) and val=y, don't either of this two conditions can prove that the method "setVal" has been called?
I also have some questions about the feedback I got
class Value is public, should be declared in a file named Value.java
public class Value
cannot find symbol
symbol : variable y
location: class Value
if(val==y&&modified==true)
*^*
*2 errors*
I gave the class a name Value, doesn't that mean the class has been declared in a file named Value.java*?
I have declared the variable y, why the compiler cann't find it? is it because y has been out of scale?
The other problem is:
Write a class named Book containing:
Two instance variables named title and author of type String.
A constructor that accepts two String parameters. The value of the first is used to initialize the value of title and the value of the second is used to initialize author .
A method named toString that accepts no parameters. toString returns a String consisting of the value of title , followed by a newline character, followed by the value of author .
And this is my response:
public class Book
String title;
String author;
public Book(String x, String y)
{ title=x; author=y; }
public String toString()
{return title;
return author;
}I want to know that is it ok to have two return statements in a single method? Because when I add the return author; to the method toString, the compiler returns a complain which says it's an unreachable statement.
Thank you very much!Lets take this slow and easy. First of all, you need to learn how to format your code for readability. Read and take to heart
{color:0000ff}http://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html{color}
Now as to your first exercise, most of it is OK but not this: public boolean wasModified()
if (val == y && modified == true)
return true;
y being a parmeter to the setValue method exists only within the scope of that method. And why would you want to test that anyways? If modified evaluates to true, that's all you need to know that the value has been modified. So you could have public boolean wasModified()
if (modified == true)
return true;
}But even that is unnecessarily verbose, as the if condition evaluates to true, and the same is returned. So in the final analysis, all you need is public boolean wasModified()
return modified;
}And a public class has to be declared in a file named for the class, yes.
As for your second assignment, NO you cannot "return" two variables fom a method. return means just that: when the return statement is encountered, control returns to the calling routine. That's why the compiler is complaining that the statement following the (first) return statement is unreachable.
Do you know how to string Strings together? (it's called concatenation.) And how to represent a newline in a String literal?
db
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