it might be a simple question or even impossible without any kind of Interface (Arrays, Maps etc.) but I would like to know if there's any possibility of converting an object name to String so I can pass as argument. I have two classes Paciente and Sintomas with multiple objects that I need to pass as argument to a function but I don't want to use arrays (it must be like that) and I can't figure any other way of doing so without manually make an insert for each one.
Paciente Paciente1 = new Paciente("001", "Ana Melo", 33, "");
Paciente Paciente2 = new Paciente("002", "Rui Costa", 13, "");
Paciente Paciente3 = new Paciente("003", "Joana Martins", 85, "");
Paciente Paciente4 = new Paciente("004", "Pedro Torres", 53, "");
Paciente Paciente5 = new Paciente("005", "Ana Gomes", 93, "");
Paciente Paciente6 = new Paciente("006", "Jorge Costa", 56, "");
Sintomas Sintoma1 = new Sintomas("001", "febre");
Sintomas Sintoma2 = new Sintomas("001", "dores");
Sintomas Sintoma3 = new Sintomas("001", "machas");
Sintomas Sintoma4 = new Sintomas("002", "febre");
Sintomas Sintoma5 = new Sintomas("002", "manchas");
Sintomas Sintoma6 = new Sintomas("003", "febre");
Sintomas Sintoma7 = new Sintomas("003", "dores");
Sintomas Sintoma8 = new Sintomas("004", "febre");
Sintomas Sintoma9 = new Sintomas("006", "manchas");
Sintomas Sintoma10 = new Sintomas("006", "dores");
// now I would like to pass to a function as argument something like this:
for(int i = 0 ; i < 6 ; i++)
kSession.insert("Paciente"+(i+1));
// instead of making
kSession.insert(Paciente1);
kSession.insert(Paciente2);
kSession.insert(Paciente3);
// and so on.
Something like this should work(asuming you mean no array because of size constraints), note that there has to be somewhere you add the data, it's also possible to load it from a txt or something, but it has to be defined at some point
List<Paciente> pacientes = new ArrayList<>(); // no size constraints, automatically expands if too small
pacientes.add(new Paciente("", "", ""));
for (Paciente paciente : pacientes) { // loop all Patientes in pacientes
kSession.insert(paciente); // add a paciente to the session, for every entry
}
ofcource same can be done for any class, or object
It all really comes down to, how do you wish to store and access the data, and where do you need to store and access it. Using ArrayList and Map's offer the utility of easily changing the size and content of a list of data, but as any data it must be initially inserted
As a side note if the patients have an ID then using a Map
Map<String, Paciente> pacientes = new HashMap<>();
provides a way to acces the patiens very fast, and the TreeMap structure is sorted on key, should that be needed.
Other options could be
Wrapper classes that manage the data, will work similarily to an ArrayList<> but you can define, rules for adding, deleting, and such from the list.
public class Wrapper{
private List<Paciente> pacientes = new ArrayList<>();
public void addPaciente(Paciente paciente){
if(!this.pacientes.contains(paciente)) // prevent multi entries
paciente.add(paciente);
}
public void addPacientes(List<Paciente> pacientes){
for(Paciente paciente : pacientes) // add all patients using the add method
this.addPaciente(paciente);
}
public List<Paciente> getPacientes(){
return this.pacientes;
}
}
You can then add the patients to the kSession, as earlier described
Finally, there is no reason why Paciente, can have the list of Sintomas, such that
public class Paciente{
private List<Sintomas> sintomas = new ArrayList<>();
public addSintomas(Sintomas sintomas){
if(!this.sintomas.contains(sintomas))
this.sintomas.add(sintomas);
}
// rest is the same principle as above in "Wrapper"
}
This way you can get a Paciente, and add a Sintomas, and then when you wish to check a Pacientes Sintomas you can just get the list of Sintomas from that Paciente
Related
I create nattable the following way. But I can get access to the cells only through getters and setters in my Student class. How else can I access cells? Should I create my own BodyDataProvider or use IDataProvider? If it is true, could someone give some examples of implementing such providers?
final ColumnGroupModel columnGroupModel = new ColumnGroupModel();
ColumnHeaderLayer columnHeaderLayer;
String[] propertyNames = { "name", "groupNumber", "examName", "examMark" };
Map<String, String> propertyToLabelMap = new HashMap<String, String>();
propertyToLabelMap.put("name", "Full Name");
propertyToLabelMap.put("groupNumber", "Group");
propertyToLabelMap.put("examName", "Name");
propertyToLabelMap.put("examMark", "Mark");
DefaultBodyDataProvider<Student> bodyDataProvider = new DefaultBodyDataProvider<Student>(students,
propertyNames);
ColumnGroupBodyLayerStack bodyLayer = new ColumnGroupBodyLayerStack(new DataLayer(bodyDataProvider),
columnGroupModel);
DefaultColumnHeaderDataProvider defaultColumnHeaderDataProvider = new DefaultColumnHeaderDataProvider(
propertyNames, propertyToLabelMap);
DefaultColumnHeaderDataLayer columnHeaderDataLayer = new DefaultColumnHeaderDataLayer(
defaultColumnHeaderDataProvider);
columnHeaderLayer = new ColumnHeaderLayer(columnHeaderDataLayer, bodyLayer, bodyLayer.getSelectionLayer());
ColumnGroupHeaderLayer columnGroupHeaderLayer = new ColumnGroupHeaderLayer(columnHeaderLayer,
bodyLayer.getSelectionLayer(), columnGroupModel);
columnGroupHeaderLayer.addColumnsIndexesToGroup("Exams", 2, 3);
columnGroupHeaderLayer.setGroupUnbreakable(2);
final DefaultRowHeaderDataProvider rowHeaderDataProvider = new DefaultRowHeaderDataProvider(bodyDataProvider);
DefaultRowHeaderDataLayer rowHeaderDataLayer = new DefaultRowHeaderDataLayer(rowHeaderDataProvider);
ILayer rowHeaderLayer = new RowHeaderLayer(rowHeaderDataLayer, bodyLayer, bodyLayer.getSelectionLayer());
final DefaultCornerDataProvider cornerDataProvider = new DefaultCornerDataProvider(
defaultColumnHeaderDataProvider, rowHeaderDataProvider);
DataLayer cornerDataLayer = new DataLayer(cornerDataProvider);
ILayer cornerLayer = new CornerLayer(cornerDataLayer, rowHeaderLayer, columnGroupHeaderLayer);
GridLayer gridLayer = new GridLayer(bodyLayer, columnGroupHeaderLayer, rowHeaderLayer, cornerLayer);
NatTable table = new NatTable(shell, gridLayer, true);
As answered in your previous question How do I fix NullPointerException and putting data into NatTable, this is explained in the NatTable Getting Started Tutorial.
If you need some sample code try the NatTable Examples Application
And from knowing your previous question, your data structure does not work in a table, as you have nested objects where the child objects are stored in an array. So this is more a tree and not a table.
I have List in StudentService
private List<Student> students = new ArrayList<>(Arrays.asList( new Student("1", "Lukasz", "Nowak", "Cicha 3", "1a"), new Student("2", "Tomasz", "Tomczyk", "Krakowska 13a", "1a"), new Student("3", "Grzegorz", "Adamiak", "Podkarpacka 8", "2b"), new Student("4", "Klaudia", "Kurcz", "Warszawska 13", "2b")));
and i want copy some of elements to PresentService and add a present
I tried to do
List<Presents> presents = new ArrayList<Student>()
but I got only errors
List<Presents> presents = new ArrayList<Student>()
This statement will not compile.
You variable definition is expecting objects of type Presents but you gave it a list of Student.
The easiest solution would be
List<Presents> presents = students.stream().map((student) -> new Present(student)).collect(Collectors.toList());
And create a constructor in Presents class
public Presents(Student student) {
//Create your present object as you would want to here
//For example if you wanted name
this.name = student.getName();
}
I have one Java object, to which I'm adding an objectlist.
Objects data = new Objects();
data.setName("E");
if(!fvalue1.equals("")){
Objects subObj3 = new Objects();
subObj3.setField(" OPERATOR", "=");
subObj3.setField("VALUE1", value1);
CObjectList cObjList3 = new CObjectList();
cObjList3.add(subObj3);
data.setSubObjects("SEL", ckObjList3);
}
if(err.length()>0){
Objects subObj8 = new Objects ();
subObj8.setField(" OPERATOR", "=");
subObj8.setField("VALUE1", err);
CObjectList ckObjList8 = new CObjectList();
cObjList8.add(subObj8);
data.setSubObjects("SEL", cObjList8);
//data.setSubObjects("SEL2", cObjList8);
//data.getField("SEL2").replace("SEL2", "SEL");
}
When I give "data.setSubObjects("SEL", cObjList8); ", the first SEL is replaced with the second. But I need both the SEL fields to be there. I have tried naming as SEL2 and then renaming it to SEL. But it doesn't work.
I am trying to create a dynamic xml from this.
Can someone help me to rename SEL2 to SEL?
Im a but confused. I want to add more data into the library however i want to collect the data from another .java file from where the library is defined.
the library code is as followed:
private static Map<String, Item> library = new TreeMap<String, Item>();
static {
library.put("01", new Item("Chris#redwich.ac.uk", "Hello",
"Kate#redwich.ac.uk", "How is the course going?", 2));
library.put("02", new Item("Kate#redwich.ac.uk", "Re: Hello",
"Chris#redwich.ac.uk", "> How is the course going?\n\nBrilliant, thanks. The students are all fantastic and are going to get top marks in their coursework.", 2));
library.put("03", new Item("A.Friend#hmail.com", "Coffee",
"Chris#redwich.ac.uk", "You're working too hard - fancy meeting for coffee?.", 5));
library.put("04", new Item("Chris#redwich.ac.uk", "Exam",
"Asif#redwich.ac.uk", "I have nearly finished writing the exam - I hope the students have revised hard.", 4));
library.put("05", new Item("A.Student#redwich.ac.uk", "Timetable",
"Chris#redwich.ac.uk", "help!!! my timetable is rubbish - i cant understand it!!! what r u going to do?", 0));
library.put("06", new Item("Chris#redwich.ac.uk", "Re: Timetable",
"A.Student#redwich.ac.uk", "Please ignore the timetables on the portal - just follow the advice on TeachMat.", 0));
library.put("07", new Item("A.Student#redwich.ac.uk", "Re: Timetable",
"Chris#redwich.ac.uk", "thx :)", 0));
The data I wish to import from another .java file code looks like this:
public String[] MessageData2(){
String messageId = messageIdText.getText();
String subject = subjectText.getText();
String recipient = recipientText.getText();
String message = messageArea.getText();
String [] messageData1 = {"0","1","2"};
messageData1 [0] = messageId;
messageData1 [1] = subject;
messageData1 [2] = recipient;
messageData1 [3] = message;
return messageData1;
it needs to follow the same convention as the previous.
What I have tried doing is this:
library.put(messageData1[0], new Item(messageData1[2], messageData1[1],
messageData1[2], messageData1[3], 0));
can anyone help?
Joe
// in a seperate file classA.java
public classA
{
// always when creating a classA object a empty TreeMap (your decision)
private Map<String, Item> library = new TreeMap<String, Item>();
public setLibrary(Map<String, Item> library)
{
this.libray = libray
}
public getLibrary()
{
return this.library;
}
}
Now you can create an Object like:
classA a = new ClassA();
a.getLibrary.put(....);
It really depends on the your whole strucrute. But setters/getters are a fundamental concept.
I want to create a WEKA Java program that reads a group of newly created data that will be fed to a premade model from the GUI version.
Here is the program:
import java.util.ArrayList;
import weka.classifiers.Classifier;
import weka.core.Attribute;
import weka.core.DenseInstance;
import weka.core.Instances;
import weka.core.Utils;
public class UseModelWithData {
public static void main(String[] args) throws Exception {
// load model
String rootPath = "G:/";
Classifier classifier = (Classifier) weka.core.SerializationHelper.read(rootPath+"j48.model");
// create instances
Attribute attr1 = new Attribute("age");
Attribute attr2 = new Attribute("menopause");
Attribute attr3 = new Attribute("tumor-size");
Attribute attr4 = new Attribute("inv-nodes");
Attribute attr5 = new Attribute("node-caps");
Attribute attr6 = new Attribute("deg-malig");
Attribute attr7 = new Attribute("breast");
Attribute attr8 = new Attribute("breast-quad");
Attribute attr9 = new Attribute("irradiat");
Attribute attr10 = new Attribute("Class");
ArrayList<Attribute> attributes = new ArrayList<Attribute>();
attributes.add(attr1);
attributes.add(attr2);
attributes.add(attr3);
attributes.add(attr4);
attributes.add(attr5);
attributes.add(attr6);
attributes.add(attr7);
attributes.add(attr8);
attributes.add(attr9);
attributes.add(attr10);
// predict instance class values
Instances testing = new Instances("Test dataset", attributes, 0);
// add data
double[] values = new double[testing.numAttributes()];
values[0] = testing.attribute(0).addStringValue("60-69");
values[1] = testing.attribute(1).addStringValue("ge40");
values[2] = testing.attribute(2).addStringValue("10-14");
values[3] = testing.attribute(3).addStringValue("15-17");
values[4] = testing.attribute(4).addStringValue("yes");
values[5] = testing.attribute(5).addStringValue("2");
values[6] = testing.attribute(6).addStringValue("right");
values[7] = testing.attribute(7).addStringValue("right_up");
values[8] = testing.attribute(0).addStringValue("yes");
values[9] = Utils.missingValue();
// add data to instance
testing.add(new DenseInstance(1.0, values));
// instance row to predict
int index = 10;
// perform prediction
double myValue = classifier.classifyInstance(testing.instance(10));
// get the name of class value
String prediction = testing.classAttribute().value((int) myValue);
System.out.println("The predicted value of the instance ["
+ Integer.toString(index) + "]: " + prediction);
}
}
My references include:
Using a premade WEKA model in Java
the WEKA Manual provided in the 3.7.10 version - 17.3 Creating datasets in memory
Creating a single instance for classification in WEKA
So far the part where I create a new Instance inside the script causes the following error:
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 10, Size: 1
in the line
double myValue = classifier.classifyInstance(testing.instance(10));
I just want to use a latest row of instance values to a premade WEKA model. How do I solve this?
Resources
Program file
Arff file
j48.model
You have the error because you are trying to access the 11th instance and have only created one.
If you always want to access the last instance you might try the following:
double myValue = classifier.classifyInstance(testing.lastInstance());
Additionally, I don't believe that you are creating the instances you hope for. After looking at your provided ".arff" file, which I believe you are trying to mimic, I think you should proceed making instances as follows:
FastVector atts;
FastVector attAge;
Instances testing;
double[] vals;
// 1. set up attributes
atts = new FastVector();
//age
attAge = new FastVector();
attAge.addElement("10-19");
attAge.addElement("20-29");
attAge.addElement("30-39");
attAge.addElement("40-49");
attAge.addElement("50-59");
attAge.addElement("60-69");
attAge.addElement("70-79");
attAge.addElement("80-89");
attAge.addElement("90-99");
atts.addElement(new Attribute("age", attAge));
// 2. create Instances object
testing = new Instances("breast-cancer", atts, 0);
// 3. fill with data
vals = new double[testing.numAttributes()];
vals[0] = attAge.indexOf("10-19");
testing.add(new DenseInstance(1.0, vals));
// 4. output data
System.out.println(testing);
Of course I did not create the whole dataset, but the technique would be the same.