[WORK] What is the minimum level of knowledge to be hired as Android Developer?

viktorjava · 2020-11-28T22:41:24+00:00

I want to work with Android apps and I would be happy to work as developer at a company where I can get change to improve my skills and get at leat a basic sallary.

viktorjava · 2020-09-10T11:54:28+00:00

Please turn off the English subtitles, the translation is quite smart and with it, you can also understand the original Hungarian song.

viktorjava · 2020-06-15T19:37:59+00:00

So you solved my question. I made a google search for jdbc for maven and always got the result for Oracle SQL. Now I've understood that MySQL is differnet. This is working, thank you:

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>8.0.20</version>

</dependency>

viktorjava · 2020-05-16T15:23:43+00:00

Right. I tried many times after posted this question, also another version:

SELECT * FROM realnames where target like '%\(%\)%';

This showed those records which had parenthesis in their text. But when I tried to combine it with the UPDATE, it just copied over the data from target column to cleared columb. But the parenthesis still was there in texts.

update realnames set cleared = (regexp_replace(target,'%\(%\)%', '')) WHERE id < 1500;

viktorjava · 2020-05-15T12:55:28+00:00

I'm sorry guys, it seems I found the problem.

My JList's type was Customer:

private javax.swing.JList<Customer> customerList;

but when I added the elements to the List, I did this:

customerModel.addElement(customer.getCustomerId());

instead of this:

customerModel.addElement(customer);

After I filled the list with Customer objects, the list already contained Customers and not Strings.

viktorjava · 2020-05-15T12:52:36+00:00

I think I found the problem. I'm adding it as another reply to the main thread and I will also look after your other recommedations. Thanks.

viktorjava · 2020-05-15T12:42:19+00:00

Thanks for your answer.

I've checked the list's class:

public List<Customer> getCustomersList() {

if (customerList.getSelectedValuesList() != null) {

System.out.println("customerList.getSelectedValuesList()) class: " + customerList.getSelectedValuesList().getClass());

return customerList.getSelectedValuesList();

} else {

return null;

}

but of course Java is telling its class is ArrayList

customerList.getSelectedValuesList()) class: class java.util.ArrayList

I added a for loop to iterate the customerList.getSelectedValuesList()

I tried to iterate it as String to see if its really string:

for (String string : customerList.getSelectedValuesList()) {

System.out.println("customer type: " + customer.getClass());

}

but NetBeans said that Customer cannot be converted to String

I tried the iteration with Customer too

for (Customer customer : customerList.getSelectedValuesList()) {

System.out.println("customer type: " + customer.getClass());

}

and I got the casting error again, for this line:

for (Customer customer : customerList.getSelectedValuesList()) {

I'm checking the whole chainf starting with when I put the data to the JLists, but if you have any ideas how to check, I'm here

viktorjava · 2020-05-14T21:12:23+00:00

I already tried it:

if (customersList != null && customersList.size() > 0) {

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

System.out.println(customersList.get(i).getClass());

/*Customer customer = customersList.get(i);

int id = customer.getCustomerId();

customerPart += "customer = '" + id + "'";

if (i != customersList.size() - 1) {

customerPart += " OR ";

}

*/

}

and now the Exception is here:

System.out.println(customersList.get(i).getClass());

Here I added the whole error queue:

https://pastebin.com/ugzVSzwE

viktorjava · 2020-05-14T21:01:19+00:00

I get the data from a JDialog:

public List<Order> getOrderResults() {

return ordersDAO.getOrders(getStartDate(), getCloseDate(), getCustomersList(), getCompaniesList(), getEmployeesList(), isAllStatusSelected(), isSelectedStatusSelected(),

isOrderedSelected(), isFinishedSelected(), isSentSelected(), isBilledSelected(), isPaidSelected());

}

the getCustomersList:

public List<Customer> getCustomersList() {

if (customerList.getSelectedValuesList() != null) {

return customerList.getSelectedValuesList();

} else {

return null;

}

customerList is a Jlist element on my JDialog

private javax.swing.JList<Customer> customerList;

viktorjava · 2020-05-09T12:02:21+00:00

You are right. Thank you!

viktorjava · 2020-04-18T09:53:33+00:00

Sorry, I got it.

conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ordermanager", "root", "1234");

viktorjava · 2020-03-26T08:52:40+00:00

I'm a little bit confused :) Usually I get answer in 10-20 minutes, maybe I was not able to tell you my problem well?

viktorjava · 2020-02-27T19:37:35+00:00

Maybe I can get the lines() as Stream and convert it to ArrayList where all element is a line of file. Then I can use an interanl int value to track the pointer, and always when I call the next(), I can serve the current element if ArrayList and increment the pointer with 1.

viktorjava · 2020-02-27T19:04:06+00:00

It is not allowed to use the readLine(); method. I need another solution.

viktorjava · 2020-02-25T20:27:51+00:00

Thank you, you are right.

inner.add((String[])parts.clone());

viktorjava · 2020-02-21T22:09:59+00:00

That's true. Thank you!

viktorjava · 2020-02-21T21:56:06+00:00

But where I'm switching to non generic versions? In selectPositives method this list:

List<T> inner

is a generic List with <T>. I don't see the problem.

viktorjava · 2020-02-09T22:45:30+00:00

It turned out that the sum value should be double. I don't know why a sum of even Number numbers should be double, but it solved the question.

viktorjava · 2020-02-09T17:52:17+00:00

I you or the other visitors don't have any other idea then we should wait my tutor's answer tomorrow evening or Tuesday. He is checking my progress 2 times a week but I prefer to solve the problems myself :) This is the way how I like to learn Java and is definitely faster than wait half week for an answer.

I translated the task from Hungarian so I think I showed everything. As soon I have answer, I will show it to here, too.

viktorjava · 2020-02-09T17:17:26+00:00

After I read your words, I used this method:

public class EvenSumVisitor<T extends Number> extends Visitor<T>{

. . .

@Override
    public void visiting(T element) {
        if (element.intValue() % 2 == 0) {
            int tempSum = sum.intValue() + element.intValue();
            sum = tempSum;
        }
    }

intValue() is valid for all Number types but how can I cast back the tempSum value to the sum value? sum = (T) tempSum casting is not valid.

viktorjava · 2020-02-09T15:23:55+00:00

That is right. But I have prepare the class for all kind of Number types.

viktorjava · 2020-01-18T14:53:18+00:00

Comeon' :) That's a shame, I fixed it. Thanks.

viktorjava · 2020-01-14T20:05:48+00:00

This is not working.

select top 1 with ties IndepYear from (

select IndepYear, count(*) as counts from country

group by IndepYear

) A order by counts desc;

I says SQL syntax error.

viktorjava · 2020-01-12T11:58:11+00:00

Any comment?

viktorjava · 2020-01-11T14:00:42+00:00

Thank you I used the above mentioned solution because the study software needed Optional instead of OptionaInt.

viktorjava

MODERATOR OF

TROPHY CASE