Add properties to ArrayList<Object> in Java

Add properties to ArrayList<Object> in Java

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Add properties to ArrayList<Object> in Java
Tag : java , By : Gazza
Date : November 24 2020, 03:41 PM

I wish this help you I have this class called Preferences. How can I push an object into this ArrayList? , You appear to need
public class User {
    private final String userName;
    public User(String userName) {
        this.userName = userName;

    public String getUserName() {
        return userName;

public class Runner {
    final List<User> users = new ArrayList<>();

    public Runner() {
        users.add(new User("User 1"));
        users.add(new User("User 2"));

    public static void main(String[] args) {
        Runner runner = new Runner();
public class User {
    private final Map<String, Object> attributes;
    public User(Map<String, Object> attributes) {
        this.attributes= attributes;
    public User(String key, Object value, Object... keysAndValues) {
        this(new LinkedHashMap<>());
        attributes.put(key, value);
        for (int i = 0; i < keysAndValues.length; i += 2)
            attributes.put((String) keysAndValues[i], keysAndValues[i+1]);

    public Map<String, Object>getAttributes() {
        return attributes;

public class Runner {
    final List<User> users = new ArrayList<>();

    public Runner() {
        users.add(new User("userName", "User 1", "favouriteNumber", 7));
        users.add(new User("userName", "User 2", "colour", Color.BLUE));

    public static void main(String[] args) {
        Runner runner = new Runner();
{ preferenceName: 'Default Date', preferenceValue: '05/07/2020' }, 
{ preferenceName: 'Default Number', preferenceValue: 55 }, 
{ preferenceName: 'goToHomepage', preferenceValue: true }
new User("Default Date", LocalDate.parse("05/07/2020", DateTimeFormatter.ofPattern("dd/MM/yyyy")),
         "Default Number", 55,
         "goToHomepage", true);
class User {
    LocalDate defaultDate;
    long defaultNumber;
    boolean goToHomepage;

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Pass An ArrayList<CustomObject> to a function that accepts as parameter an ArrayList<Object> in Java

Tag : java , By : Kuer
Date : March 29 2020, 07:55 AM
it should still fix some issue I am writing a generic java-android function that will accept as one of it's parameters an ArrayList, so that I can use all over my application regardless of the type of the ArrayList elements. , Change your function from
public GenericDisplayAdapter(Activity activity, ArrayList<Object> arrData)
public GenericDisplayAdapter(Activity activity, ArrayList<?> arrData)

How to get properties of an object stored in ArrayList using Java

Tag : java , By : user183275
Date : March 29 2020, 07:55 AM
I hope this helps you . Instead of System.out.println(StudentList.getStudentList().get(i));, you should access the student's properties and print it out.
Student s = (Student) StudentList.getStudentList().get(i);

Writing into text file from ArrayList that has multiple values per ArrayList object (java)

Tag : java , By : beng
Date : March 29 2020, 07:55 AM
Hope this helps BufferedWriter has a newLine() method, you may use that if you declare output as a BufferedWriter .
private static void saveFile(ArrayList<Vehicle> vehs){
    File fileName = new File("VehicleList.txt"); 

    try {
        FileWriter fw = new FileWriter(fileName);
        BufferedWriter output = new BufferedWriter(fw);

        for (int i = 0; i < vehs.size(); i++){


    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, "I cannot create that file");

Java 8 streams : Combine properties of two objects which are in ArrayLists into an ArrayList of a third object type

Tag : java , By : Paul McKee
Date : March 29 2020, 07:55 AM
To fix the issue you can do If they don't follow the same order, you'll need to create an ID map first:
Map<Integer, User> usersById = users.stream()
        .collect(Collectors.toMap(User::getUserId, u -> u));
List<UserCompanyView> views = userCompanies.stream()
        .map(uc -> new UserCompanyView(usersById.get(uc.getUserId()), uc))
.filter(uc -> usersById.containsKey(uc.getUserId()))

Java arraylist of arraylist - create a multi dimensional arraylist with a class object

Tag : java , By : General Mills
Date : March 29 2020, 07:55 AM
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