This is my function, to find a id from list by matching titles
public static int findIdByTitle(List<Integer> IDs, List<String> Titles ,String title){
for (int i = 0; i < IDs.size(); i++){
if (Titles.get(i).equals(title))
return IDs.get(i);
}
return 0;
}
This function search in model list and find id
But I can't use this because:
int id = findIdByTitle(Core.userSignIn.getBasicList().getGradeList().get(****?****).getID()
,Core.userSignIn.getBasicList().getGradeList().get(****?****).getName()
,spinnerGrade.getSelectedItem().toString());
I must give it a number position : ( see the lists.get(****?****).getID() or getName()
I want using that's function for all models not just for this model
give 2 lists and a matching word, use matching word to find position of that's in list, and give me a ID of this position
All of my model have ID , Title and some of them have ParentID
with help of Nitin , My problem has been resolved:
List<String> Titles = new ArrayList<>();
List<Integer> IDs = new ArrayList<>();
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
Titles = Core.userSignIn.getBasicList().getGradeList().stream().map(GradeList::getGradeName).collect(Collectors.toList());
IDs = Core.userSignIn.getBasicList().getGradeList().stream().map(GradeList::getGradeID).collect(Collectors.toList());
} else {
Titles = new ArrayList<>(Core.userSignIn.getBasicList().getGradeList().size());
IDs = new ArrayList<>(Core.userSignIn.getBasicList().getGradeList().size());
for (GradeList gradeList : Core.userSignIn.getBasicList().getGradeList()) {
Titles.add(gradeList.getGradeName());
IDs.add(gradeList.getGradeID());
}
}
educationList1.setiGradeID(findIdByTitle(IDs
,Titles
,spGrade.getSelectedItem().toString()));
You first have to convert your list to List of Integer and List of String and then pass it to your method. You can use below code if you are using Java 8:
final List<Integer> testList1 = BasicList().getGradeList().stream().map(Test::getId).collect(Collectors.toList());
final List<String> testList2 = BasicList().getGradeList().stream().map(Test::getName).collect(Collectors.toList());
Replace your class name in place of Test in above code.
Use below code for below java 8 env:
List<String> strings = new ArrayList<>(BasicList().getGradeList().size());
for (Test test : BasicList().getGradeList()) {
strings.add(test.getName());
}
Similar for Ids.
You need another loop if you want to get all Ids of your models, you can do something like this :
List<Integer> listId=new ArrayList<Integer>();
for(int i=0; i<BasicList().getGradeList().size(); i++) {
listId.add(findIdByTitle(BasicList().getGradeList().get(i).getID()
,BasicList().getGradeList().get(i).getName()
,spinnerGrade.getSelectedItem().toString()));
}
Related
I have a String 2D-array named items in my app like this :
String[][] items = {
{"(kilogram)","1"},
{"(gram)","1000"},
{"(pound)","2.20462262"},
{"(pound - troy)","2.6792288807"},
{"(carat)","5000"},
{"(ounce)","35.2739619"},
{"(ounce - troy)","32.1507466"},
}
and I want to have a String ArrayList that include first parameter of each item data, something like this :
ArrayList<String> data = new ArrayList<>();
data = {(kilogram),(gram),(pound),(pound - troy),(carat),(ounce),(ounce - troy)}
i used this code but unfortunately it didn't work
ArrayList<String> data = new ArrayList<>();
for (int i = 0; i <= items.length;) {
data.add(items[i][0]);
i++;
}
You can also use streams to build this list:
List<String> data = Stream.of(items)
.map(item -> item[0])
.collect(Collectors.toList());
If you still want to use a for loop go with (use < instead of <=):
for (int i = 0; i < items.length; i++) {
data.add(items[i][0]);
}
I'm working with a large set of imported data and retrieving certain parts of it in the main method with 2 classes(WeatherStation, WeatherReading).The data is temperature readings at loads of weather stations(station id, name, lat, lon, year, time, temp etc) I made a third class (SoloSiteIds) whose sole purpose was to return a whole and complete ArrayList of the site ids with no duplication. But I cannot import the ArrayList from the other class into my main method. My SoloSiteIds class looks like this:
public class SoloSiteIds {
static ArrayList <Integer> siteIds = new ArrayList <Integer>();
public SoloSiteIds() {
}
public SoloSiteIds( ArrayList <Integer> siteIds) {
String[] weatherData = WeatherData.getData();{ // get the weather data
for (int i = 1; i < weatherData.length; i++) {
String line = weatherData[i];
String[] elements = line.split(","); // Split the data at ",
String siteid = elements[0]; // convert all the site id's at index 0 to integers
int id = Integer.parseInt(siteid);
if(!siteIds.contains(id)) {
siteIds.add(id);
}
this.siteIds=siteIds;
}
}
}
public static ArrayList<Integer> getSiteIds() {
return siteIds;
}
public ArrayList<Integer> setSiteIds(ArrayList<Integer> siteIds) {
return this.siteIds = siteIds;
}
}
The main method where I am trying to import the ArrayList "siteIds" looks like this:
WeatherStation thisStation = new WeatherStation (id, name, lat, lon);
WeatherReading thisReading = new WeatherReading(year, month, date, hour, windSpeed, temp);
SoloSiteIds siteList= new SoloSiteIds();
String[] weatherData = WeatherData.getData();{ // get the weather data
for (int i = 1; i < weatherData.length; i++) {
String line = weatherData[i];
String[] elements = line.split(","); // Split the data at ","
String siteid = elements[0]; // convert all the site id's at index 0 to integers
id = Integer.parseInt(siteid);
thisStation.setId(id);
thisStation.setName(elements[1]);
//parse the different elements into different data types
String stringLat = elements[2];
lat= Double.parseDouble(stringLat);
lat = thisStation.setLat(lat);
lat=thisStation.setLat(lat);
String stringLon = elements[3];
lon= Double.parseDouble(stringLon);
lat = thisStation.setLon(lon);
lat=thisStation.setLon(lon);
String stringTemp=elements[9];
temp=Double.parseDouble(stringTemp);
temp=thisReading.setTemp(temp);
Only the top part is relevant. I have tried lots of different variation of .set and .get using "thisList" instance and a new ArrayList like
ArrayList<Integer> siteIds = thisList.setSiteIds();
ArrayList<Integer> siteIds= SoloSiteIds.getSiteIds();
thisList=Siteids.setSiteIds();
thisList=SingleSoloSites.setSiteIds();
etc etc. This might look stupid but im just showing Ive tried numerous things and i am stuck
Thanks
I believe your problem is that you are initializing siteIds as an empty Arry list but you are not setting the data in a static way (the set Method is not static).
As far as I am aware of your situation, I belive that the SoloSiteIds class is unnescessary. I would solve your problem with an ArrayList declared in your main class and initialize with a getSoleIds() method also declared in your main class.
The getSoleIds() Method should contain the code currently in the SoleSiteIds initializer.
I am trying to iterate through many arrays, two at a time. They contain upwards of ten-thousand entries each, including the source. In which I am trying to assign each word to either a noun, verb, adjective, or adverb.
I can't seem to figure a way to compare two arrays without writing an if else statement thousands of times.
I searched on Google and SO for similar issues. I couldn't find anything to move me forward.
package wcs;
import dictionaryReader.dicReader;
import sourceReader.sourceReader;
public class Assigner {
private static String source[], snArray[], svArray[], sadvArray[], sadjArray[];
private static String nArray[], vArray[], advArray[], adjArray[];
private static boolean finished = false;
public static void sourceAssign() {
sourceReader srcRead = new sourceReader();
//dicReader dic = new dicReader();
String[] nArray = dicReader.getnArray(), vArray = dicReader.getvArray(), advArray = dicReader.getAdvArray(),
adjArray = dicReader.getAdjArray();
String source[] = srcRead.getSource();
// Noun Store
for (int i = 0; i < source.length; i++) {
if (source[i] == dicReader.getnArray()[i]) {
source[i] = dicReader.getnArray()[i];
}else{
}
}
// Verb Store
// Adverb Store
// Adjective Store
}
}
Basically this is a simpler way to get a list of items that are in both Lists
// construct a list of item for first list
List<String> firstList = new ArrayList<>(Arrays.asList(new String[0])); // add items
//this function will only keep items in `firstList` if the value is in both lists
firstList.retainAll(Arrays.asList(new String[0]));
// iterate to do your work
for(String val:firstList) {
}
This is my starting code for a van rental database.
List<String> manual = new LinkedList<>();
List<String> automatic = new LinkedList<>();
List<String> location = new LinkedList<>();
manual.add("Queen");
manual.add("Purple");
manual.add("Hendrix");
automatic.add("Wicked");
automatic.add("Zeppelin");
automatic.add("Floyd");
automatic.add("Ramones");
automatic.add("Nirvana");
location.add("CBD");
location.add("Penrith");
location.add("Ceremorne");
location.add("Sutherland");
How can I link the cars to the location.
For example, location CBD has Wicked,Zepplin and Floyd, and Penrith has Queen.
So if the command line arguement has "Print CBD" then it must show the vans available in CBD.
Any help will be appreciated.
This is hardly a database. They are just three separate data pieces. Use some object-oriented design technique to create classes, such as a class called Van. For example, it's not java code exactly, just for example.
Class Van {
string name;
VanType type; // e.x, Enum {auto, manual}
Location location; // another class
}
I think you would be better off using the approach explained In This Post. I believe this would be a much clearer implementation.
I hope this helps.
Ok thats the code.
We are using only linked list as you wanted.
(linked list keeps track on the input order so we are using that too)
As it is one to many relation we should have some kind of "foreign key" so we can see the related object. For each car you add no matter manual or auto, you should add a key for the location as you can see below
for example rels[0] = 3; means that your first car will have relation with 4th object of the locations list. thats implemented in the code - take a look.
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
public class TestMain {
public static void main(String[] args) {
List<String> manual = new LinkedList<String>();
List<String> automatic = new LinkedList<String>();
List<String> location = new LinkedList<String>();
int[] rels = new int[8];
//cars with relations
rels[0] = 1;
manual.add("Queen");
rels[1] = 1;
manual.add("Purple");
rels[2] = 1;
manual.add("Hendrix");
rels[3] = 1;
automatic.add("Wicked");
rels[4] = 0;
automatic.add("Zeppelin");
rels[5] = 0;
automatic.add("Floyd");
rels[6] = 1;
automatic.add("Ramones");
rels[7] = 2;
automatic.add("Nirvana");
//key-0
location.add("CBD");
//key-1
location.add("Penrith");
//key-2
location.add("Ceremorne");
//key-3
location.add("Sutherland");
//here is the value that you have from your input args[] for example
String desiredLocation = "CBD";
int index = getLocationIndex(location, desiredLocation);
//if desired location not found we will print nothing
if(index==-1)return;
List mergedCars = new LinkedList<String>();
mergedCars.addAll(manual);
mergedCars.addAll(automatic);
for (int i = 0; i < rels.length; i++) {
if(index == rels[i])
{
System.out.println(mergedCars.get(i));
}
}
}
private static int getLocationIndex(List<String> location, String desiredLocation) {
int counter=0;
for (Iterator iterator = location.iterator(); iterator.hasNext();) {
String temp = (String) iterator.next();
if(temp.equals(desiredLocation))
{
return counter;
}
counter++;
}
return -1;
}
}
I want to fetch only a single company name and I want to fetch it only once. So if it already was fetched, it should not be fetched again.
Here is the code:
private static String[] billercompanies = {
"1st",
"TELUS Communications",
"Rogers Cablesystems",
"Shaw Cable",
"TELUS Mobility Inc",
"Nanaimo Regional District of",
"Credit Union MasterCard",
};
public static String GetBillerCompany(){
String randomBillerComp = "";
randomBillerComp = (billercompanies[new Random().nextInt(billercompanies.length)]);
return randomBillerComp;
}
Just shuffle the array you want using Collections
Collections.shuffle(List);
So simply create a list from your array
List<E> list = Arrays.asList(array);
Then shuffle it using the method above
Collections.shuffle(list);
Your list can be read from left to right as it was random.
So simply save the index
int currentIndex = 0;
public E getRandom(){
//If at the end, start over
if(++currentIndex == list.size()) {
currentIndex = 0;
shuffle(list);
}
return list.get(currentIndex);
}
Each time you want to forget the duplicate list you already used, simply shuffle the array again
Collections.shuffle(list);
Without index
You could simply remove the first value each time, once the list is empty, recreate it with the original array. As Ole V.V. pointer out, a List generated by Arrays.asList(E[]) doesn't support the remove methods so it is necessary to generate a new instance from it.
Here is a quick and simple class using this solution :
public class RandomList<E>{
E[] array;
List<E> list;
public RandomList(E[] array){
this.array = array;
buildList(array);
}
public E getRandom(){
if(list.isEmpty()) buildList(array);
return list.remove(0);
}
public void buildList(E[] array){
list = new ArrayList<E>(Arrays.asList(array));
Collections.shuffle(list);
}
}
And the test was done with this small code :
Integer[] array = {1,2,3,4,5};
RandomList<Integer> rl = new RandomList(array);
int i = 0;
while(i++ < 10)
System.out.println(rl.getRandom());
Make a copy in a List and remove the element when it was already fetched.
Arrays.asList(array) is not modifiable but you can wrap it in a full featured List.
List<String> billercompaniesList = new ArrayList<>(Arrays.asList(billercompanies));
String randomBillerComp = "";
Random random = new Random();
// first retrieval
int index = random.nextInt(billercompaniesList.size());
randomBillerComp = billercompaniesList.get(index);
billercompaniesList.remove(index);
// second retrieval
index = random.nextInt(billercompaniesList.size());
randomBillerComp = billercompaniesList.get(index);
billercompaniesList.remove(index);
// and so for