We Keep Coding

How to get the data that is stored in ArrayList from another class in Java/Android? [duplicate]

This question already has answers here:
How to access ArrayList from another class in Android Java?
(3 answers)
Closed 7 years ago.
I'm new in Java/Android and I'm trying to do one thing, but I'm not sure if I can or I can't do it.
My problem is this: I'm parsing a Json and I send this json to my class. All is correct, json works and the data is stored correctly. That I want to do, is access to the data that I've stored in the arrayList from another class, but I don't know how to do it.
I've tried to implement a singleton java class, but I can't access to the data.
That I said is for exampl. If I create this method I can access to the data, but I need to pass the data from my json to the method.
public String showOverlay(ArrayList<ScreenEvent> config){
String show = "";
String empty = "empty";
for(ScreenEvent client : config){
show = client.action;
if(show.equals("show"))
return show;
}
return empty;
}
I don't want to do this. I want to be able to create an object of the arrayList inside of my method:
public String myMethod(){
//I want access here to the data of the arrayList
return empty;
}
I read a json and pass the data in a ArrayList:
public static ArrayList<VsClientConfig.ScreenEvent> eventConfig = new ArrayList<VsClientConfig.ScreenEvent>();
//JSON stuff
VsClientConfig.ScreenEvent vs = VsClientConfig.ScreenEvent.getScreenEvent(action, className, typeEvent, viewId, colourEvent);
eventConfig.add(vs);
This is my class:
public class VsClientConfig{
public String colour;
public String height;
public static class ScreenEvent {
public String action;
public String className;
public String typeEvent;
public String viewId;
public String colourEvent;
private static ScreenEvent miScreenEvent;
public static ScreenEvent getScreenEvent(String action, String className, String typeEvent, String viewId, String colourEvent) {
if (miScreenEvent == null) {
miScreenEvent = new ScreenEvent(action, className, typeEvent, viewId, colourEvent);
}
return miScreenEvent;
}
private ScreenEvent(String action, String className, String typeEvent, String viewId, String colourEvent) {
this.action = action;
this.className = className;
this.typeEvent = typeEvent;
this.viewId = viewId;
this.colourEvent = colourEvent;
}
}
public String myMethod(){
//I want access here to the data of the arrayList
return empty;
}
...

Create and initialize static arrayList in a Common class like below:
public class Common{
public static ArrayList<VsClientConfig.ScreenEvent> eventConfig=new ArrayList<>();
}
And assign if from wherever you want like:
//JSON stuff
VsClientConfig.ScreenEvent vs = VsClientConfig.ScreenEvent.getScreenEvent(action, className, typeEvent, viewId, colourEvent);
Common.eventConfig.add(vs);
Now Common.eventConfig (your arrayList) will be accessible to through your application

Q: How to print a specific field of a specific row from my TableView?

i have the following problem: I read out database items in an observable list. Now I want to display some items from the selected line in a few textfields on the right side of my tableview.
I got the observable-line-index with the following code, but I want to select an other column of the line.
AnalysemethodenTable.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<Object>() {
public void changed(ObservableValue<?> observable, Object oldvalue, Object newValue) {
index.set(analysemethodendata.indexOf(newValue));
databaseIndex = (analysemethodendata.indexOf(newValue) + 1);
System.out.println("Index:\t" + databaseIndex);
}
});
I found the following code: Click
But i don't understand this. It's something like to write a new list and place a copy of the items of the observable list in this new list.
I think, if I have the index of the line with my code, I can select the other items in the line of the observable list, too (I thought like "x,y" like an array)
If i cast it to String, the output is only machine code.
Hope I can understand the solution with your help!
EDIT: I inserted the following code:
System.out.println(analysemethodendata.get(databaseIndex).toString());
But I only get machine code in my Output:
table.analysemethoden_table#63c0d5b7
EDIT 2:
Table-Controller-Code:
package table;
import javafx.beans.property.SimpleFloatProperty;
import javafx.beans.property.SimpleStringProperty;
public class analysemethoden_table {
private final SimpleStringProperty rAmnorm;
private final SimpleStringProperty rMethverantw;
private final SimpleFloatProperty rBestimmungsgrenze;
private final SimpleFloatProperty rNachweisgrenze;
public analysemethoden_table (String sAmnorm, String sMethoverantw, Float sBestimmungsgrenze, Float sNachweisgrenze) {
this.rAmnorm = new SimpleStringProperty(sAmnorm);
this.rMethverantw = new SimpleStringProperty(sMethoverantw);
this.rBestimmungsgrenze = new SimpleFloatProperty(sBestimmungsgrenze);
this.rNachweisgrenze = new SimpleFloatProperty(sNachweisgrenze);
}
// Getter- und Setter-Methoden
/** rAmnorm **/
public String getRAmnorm() {
return rAmnorm.get();
}
public void setRAmnorm(String set) {
rAmnorm.set(set);
}
/** rMethverantw **/
public String getRMethverantw() {
return rMethverantw.get();
}
public void setRMethverantw(String set) {
rMethverantw.set(set);
}
/** rBestimmungsgrenze **/
public Float getRBestimmungsgrenze() {
return rBestimmungsgrenze.get();
}
public void setRBestimmungsgrenze(Float set) {
rBestimmungsgrenze.set(set);
}
/** rNachweisgrenze **/
public Float getRNachweisgrenze() {
return rNachweisgrenze.get();
}
public void setRNachweisgrenze(Float set) {
rNachweisgrenze.set(set);
}
}

You need to use
analysemethodendata.get(databaseIndex).getRAmnorm();
or any other getter method in place of getRAmnorm() to get the required output.
databaseIndex -> row number

Parsing csv via column order in spring batch

I've got a CSV in the format...
Kitten URL,Kitten Name,# of Reviews,Rating,Categories,,,,,,,,,,,,,
www.happykitten.com,happykittem.com,111746,7.8,Clothes & Fashion,Fashion Accessories,Ladies wear,Menswear,,,,,,,,,,
animedkitten.co.uk,Animed Kitten,33918,9.6,Pets,,,,,,,,,,,,,
So the first columns are Kitten URL,Kitten Name,# of Reviews,Rating then the rest are the possible categories listed as extra properties.
I'm trying to use Spring batch so I'm specifying the dumb object to represent this CSV. The first problem I've got is (using the example from Spring documentation I don't see how I can parse a CSV with spaces in the title. Is it possible to use Spring batch like this? Can I annotate each getting like in Hibernate with the title of the csv column?
My dumb object was going to be something like...
public class ImportDataObject {
private String kittenUrl;
private String kittenName;
private int numOfReviews;
public String getKittenUrl() {
return kittenUrl;
}
public void setKittenUrl(String kittenUrl) {
this.kittenUrl = kittenUrl;
}
public String getKittenName() {
return kittenName;
}
public void setKittenName(String kittenName) {
this.kittenName = kittenName;
}
public int getNumOfReviews() {
return numOfReviews;
}
public void setNumOfReviews(int numOfReviews) {
this.numOfReviews = numOfReviews;
}
}
I only really want to read the first 2 columns, append some strings, then persist the rest of the CSV.
I'm also considering the best approach to use for these multiple commas afterwards. Unfortunately this is how I've got the data and it's not something I can change.

You can implement FieldSetMapper for your object and then set it to your DefaultLineMapper. Your implementation of FieldSetMapper can work on positions and you can parse only first few positions and set it to your bean.
Here is suggestion based on code from URL you posted:
reader.setLineMapper(new DefaultLineMapper<ImportDataObject>());
setFieldSetMapper(new ImportDataObjectFieldSetMapper());
}});
setLinesToSkip(1); //skip header since read int will throw exception and I assume you do not need header info
}});
Then changes to POJO object to save list of categories:
public class ImportDataObject {
private String kittenUrl;
private String kittenName;
private int numOfReviews;
private int rating; //add getters and setters
private List<String> categories; //add getters and setters
public String getKittenUrl() {
return kittenUrl;
}
public void setKittenUrl(String kittenUrl) {
this.kittenUrl = kittenUrl;
}
public String getKittenName() {
return kittenName;
}
public void setKittenName(String kittenName) {
this.kittenName = kittenName;
}
public int getNumOfReviews() {
return numOfReviews;
}
public void setNumOfReviews(int numOfReviews) {
this.numOfReviews = numOfReviews;
}
}
And here is FieldSetMapper:
public class ImportDataObjectFieldSetMapper implements FieldSetMapper<ImportDataObject> {
#Override
public ImportDataObject mapFieldSet(final FieldSet fieldSet) throws BindException {
final ImportDataObject importDataObject = new ImportDataObject();
importDataObject.setKittenUrl(fieldSet.readString(0));
importDataObject.setKittenName(fieldSet.readString(1));
importDataObject.setNumOfReviews(fieldSet.readInt(2));
importDataObject.setRating(fieldSet.readInt(3));
importDataObject.setCategories(new ArrayList<String>());
for (int i = 4; i < fieldSet.getFieldCount(); i++) {
importDataObject.getCategories().add(fieldSet.readString(i));
}
return importDataObject;
}
}

how I can put a dynamic filtered xpage view / repeat control into a hashmap?

Can I easily put the entry values of a filtered view into a hashmap?
I have a repeat control, bound to a view, with a dynamic filter.
The user can change the filter by several djFilteringSelect controls, corresponding to the view columns.
Depending on the selection in the 1st djFilteringSelect, the selection in the next djFilteringSelects should be limited to the possible entries ("similar to the data filter in excel"). At the moment I do this with separate #dbcolumn/#dblookup methods for the djFilteringSelects, but I think it is much better and easier to just fill the view entries values into a hashmap and show the hashmap values in the djFilteringSelect.
I found few threads here with repeat controls and hashmaps, but these examples also build the doc collection separatly, which I wish to avoid.
Thanks for any help,
Uwe

There's a reason why all these examples build their document collections separately. Instead of "the view is in the UI", so I must use it, you might have an easier time to build a bean that serves as the source for your repeat control. A bean data source or a managed bean. This will allow for a use case, where you show 2 filter results (e.g England/London and France/Lyon) in one display, something a filtered view can't do.
Update
If you have a lot of reader/author fields, you want to have a view categorized by them, to populate your "backing bean" - there is lot of performance to gain. Holding a few hundred items in memory isn't a big deal.
There are 2 trains of though: make it generic, so every line in the view ends up as a Collection item (Array, List, Map etc.) or to build dedicated line items with clear names. This trains collide quite often, let me take you to the dedicated train for a moment. :-) So your classes (you need 2) would look like this:
package test;
import java.io.Serializable;
import java.util.Vector;
import lotus.domino.Database;
import lotus.domino.Document;
import lotus.domino.NotesException;
import lotus.domino.ViewEntry;
public class Fruit implements Serializable {
private static final long serialVersionUID = 1L;
private String name;
private String color;
private String shape;
private String taste;
private String unid = null;
public Fruit() {
// default constructor, might not be needed
}
// To make it easy from a view
public Fruit(final ViewEntry ve) {
try {
#SuppressWarnings("rawtypes")
Vector v = ve.getColumnValues();
// 0 would be the user/group/role
this.setName(v.get(1).toString());
this.setColor(v.get(2).toString());
this.setShape(v.get(3).toString());
this.setTaste(v.get(4).toString());
this.unid = ve.getUniversalID();
} catch (NotesException e) {
e.printStackTrace();
}
}
public void save(Database db) throws NotesException {
Document doc;
if (this.unid == null) {
doc = db.createDocument();
} else {
doc = db.getDocumentByUNID(this.unid);
}
doc.replaceItemValue("Color", this.getColor());
// more here
doc.save();
}
public final String getName() {
return this.name;
}
public final void setName(String name) {
this.name = name;
}
public final String getColor() {
return this.color;
}
public final void setColor(String color) {
this.color = color;
}
public final String getShape() {
return this.shape;
}
public final void setShape(String shape) {
this.shape = shape;
}
public final String getTaste() {
return this.taste;
}
public final void setTaste(String taste) {
this.taste = taste;
}
}
That's to hold a line item (using my favourite fruits example). In your code the repeat control variable (or the data table variable) - instead of the view control, would hold one Fruit instance coming from fruitController.getSelectedFruits() (which you can use in EL as fruitController.selectedFruits), so you can bind your columns using varName.color, varname.shape
The class around it looks roughly like:
package test;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;
import java.util.TreeSet;
import lotus.domino.Database;
import lotus.domino.NotesException;
import lotus.domino.Session;
import lotus.domino.View;
import lotus.domino.ViewEntry;
import lotus.domino.ViewEntryCollection;
public class FruitController implements Serializable {
private static final long serialVersionUID = 1L;
private static final String FRUIT_VIEW = "(FruitsByUser)";
private final Collection<Fruit> allFruits = new ArrayList<Fruit>();
private final Set<String> colors = new TreeSet<String>();
private final Set<String> shape = new TreeSet<String>();
private final Set<String> taste = new TreeSet<String>();
private String colorFilter = null;
private String tasteFilter = null;
private String shapeFilter = null;
// if you use this controller, you only can use an object data source!
// for a bean you would need an empty controller
public FruitController(final Session s, final Database db) {
this.populateData(s, db);
}
public final String getColorFilter() {
return this.colorFilter;
}
public final String[] getColors() {
return (String[]) this.colors.toArray();
}
public Collection<Fruit> getSelectedFruits() {
Collection<Fruit> result = new ArrayList<Fruit>();
for (Fruit f : this.allFruits) {
if (this.matchesFilter(f)) {
result.add(f);
}
}
return result;
}
public final String[] getShape() {
return (String[]) this.shape.toArray();
}
public final String getShapeFilter() {
return this.shapeFilter;
}
public final String[] getTaste() {
return (String[]) this.taste.toArray();
}
public final String getTasteFilter() {
return this.tasteFilter;
}
public void resetFilters() {
this.setColorFilter(null);
this.setShapeFilter(null);
this.setTasteFilter(null);
}
public final void setColorFilter(String colorFilter) {
this.colorFilter = colorFilter;
}
public final void setShapeFilter(String shapeFilter) {
this.shapeFilter = shapeFilter;
}
public final void setTasteFilter(String tasteFilter) {
this.tasteFilter = tasteFilter;
}
private boolean matchesFilter(Fruit f) {
boolean result = true;
result = ((result == false) ? false : ((this.colorFilter == null || "".equals(this.colorFilter.trim())) ? true
: (this.colorFilter.equals(f.getColor()))));
result = ((result == false) ? false : ((this.tasteFilter == null || "".equals(this.tasteFilter.trim())) ? true
: (this.tasteFilter.equals(f.getTaste()))));
result = ((result == false) ? false : ((this.shapeFilter == null || "".equals(this.shapeFilter.trim())) ? true
: (this.shapeFilter.equals(f.getShape()))));
return result;
}
private void populateData(final Session s, final Database db) {
try {
final View v = db.getView(FRUIT_VIEW);
// You might need to loop a little here to get all the values
final ViewEntryCollection vec = v.getAllEntriesByKey(s.getUserName());
ViewEntry ve = vec.getFirstEntry();
while (ve != null) {
ViewEntry nextVe = vec.getNextEntry(ve);
Fruit f = new Fruit(ve);
this.updateSelectors(f);
this.allFruits.add(f);
ve = nextVe;
nextVe.recycle();
}
vec.recycle();
v.recycle();
} catch (NotesException e) {
// TODO Stacktrace is no error handling
e.printStackTrace();
}
}
private void updateSelectors(Fruit f) {
this.colors.add(f.getColor());
this.shape.add(f.getShape());
this.taste.add(f.getTaste());
}
}
Of course you can make that more sophisticated by filtering the selection values based on the other selections (e.g. after picking a color only offer the shapes that are available in that color). Using the class as object datasource (e.g. fruitController) should be easy. You can bind your dropdowns to fruitController.colorFilter etc. in EL and define the selections in EL as fruitController.Colors.
Update 2
The data source should be an object data source, like this one:
<xp:this.data>
<xe:objectData var="fruitController" ignoreRequestParams="true"
readonly="false" scope="view"
createObject="#{javascript:return new test.FruitController(session, database);}">
</xe:objectData>
</xp:this.data>
For a bean approach you would need to edit the faces-config.xml and change the class to have a parameterless constructor. For the select values you could stick with the toArray() call in your page or better change the class to return an array in the first place. I updated the class above accordingly (so you can still use EL, no need for SSJS).
Now you only need to add a refresh to the repeat in the onChange event of your selects. Since the new values will be send to the object data source (you bound them to colorFilter, shapeFilter, tasteFilter) the refresh will execute #{fruitController.selectedFruits} which delivers the subset back to the panel.
So the concept here is: You fetch all the user data once into the object data source and once that is loaded filter inside that class, no renewed retrieval or lookup required.
Let us know hoe it goes

How to add to an arraylist of class type

Ok so this is what I have
public class Register {
public String propertyID;
public String PPSNumber;
Register(String aPropertyID, String aPPSNumber) {
propertyID = aPropertyID;
PPSNumber = aPPSNumber;
}
public void setPPSNumber(String aPPSNumber) {
PPSNumber = aPPSNumber;
}
public String getPPSNumber() {
return PPSNumber;
}
public String getPropertyID() {
return propertyID;
}
}
Then I have this
public static ArrayList<Register> registers = new ArrayList<Register>();
public static void main(String[] args) {
String userInput1 = "", userInput2 = "", userInput3 = "";
userInput1 = JOptionPane.showInputDialog("Enter your PPSNumber");
userInput2 = JOptionPane.showInputDialog("Enter your propID");
registers.add("number", "id");
}
I don't understand why It wont let me add to the ArrayList. Is there some way of adding class types to ArrayLists?

Try this instead :
registers.add(new Register("number","id"));
EDIT 1:
To answer your question, you can create a separate "register" and the use the getters :
Register aRegister = new Register("number","id");
registers.add(aRegister);
System.out.println(aRegister.getPropertyID()+" "+ aRegister.getPPSNumber());

Your List is of type Register so you need to add object of Register class only.
Nothing wrong in create as many Register objects as required.
You can implement toString() method inside Register class then the below sysout will work given the register variable is initialized with Register object. Check this How to override toString() properly in Java? to know about toString implementation.
System.out.println(register)