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Explicitly multiplying values as longs


Explicitly multiplying values as longs

By : user3861768
Date : November 21 2020, 07:01 PM
should help you out I understand that all math is done as the largest data type required to handle the current values but when you transverse a loop how do you explicitly multiply longs? The following code returns 0, I suspect, because of an overflow. , Changing the first line into the following will help:
code :


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Convert an array of primitive longs into a List of Longs

Convert an array of primitive longs into a List of Longs


By : user324235
Date : March 29 2020, 07:55 AM
this will help I found it convenient to do using apache commons lang ArrayUtils (JavaDoc, Maven dependency)
code :
import org.apache.commons.lang3.ArrayUtils;
...
long[] input = someAPI.getSomeLongs();
Long[] inputBoxed = ArrayUtils.toObject(input);
List<Long> inputAsList = Arrays.asList(inputBoxed);
long[] backToPrimitive = ArrayUtils.toPrimitive(objectArray);
64-bit G++ 4.6.3 doesn't treat longs as long longs in specialised function templates, even though they're the same size.

64-bit G++ 4.6.3 doesn't treat longs as long longs in specialised function templates, even though they're the same size.


By : Tathagata Mohanty
Date : March 29 2020, 07:55 AM
wish helps you The underlying type of int64_t can be anything that meets the requirements. It's okay to make it long on one platform and long long on another.
Since you provide a specialization for long long and the generic version has no body, if int64_t is not a long long you get an undefined reference.
Why is JOOQ restricted to Integer values and not Longs?

Why is JOOQ restricted to Integer values and not Longs?


By : Simon
Date : March 29 2020, 07:55 AM
hop of those help? In your database, LOGGED_IN.USER_ID is probably of the SQL type INT which has its best equivalence in a Java Integer or a Scala Int. If you wanted to operate on a Long, you should change your database column's type to BIGINT.
There's no way around this "limitation", which is a good thing in my opinion. For instance, you cannot insert a Long into an INT database column. With jOOQ, the Java / Scala compilers will prevent that from happening accidentally.
code :
trait SNumberField[T <: Number] extends SAnyField[T] {
  // [...]
  def equal(value : Number)        : Condition;
  def equal(value : Field[Number]) : Condition;
}

abstract class NumberFieldBase[T <: Number](override val underlying: Field[T])
    extends AnyFieldBase[T] (underlying)
    with SNumberField[T] {

  // [...]
  def equal(value : Number)
    = underlying.equal(underlying.getDataType().convert(value));
  def equal(value : Field[_ <: Number]) 
    = underlying.equal(value.coerce(underlying.getDataType());
}
I have a list of Longs that represent time in milliseconds. How can I create a ListView that formats the Longs into MM:S

I have a list of Longs that represent time in milliseconds. How can I create a ListView that formats the Longs into MM:S


By : prasad
Date : March 29 2020, 07:55 AM
This might help you Use a cell factory:
code :
import javafx.application.Application;
import javafx.collections.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.stage.Stage;

import java.util.Calendar;

public class TimeList extends Application {
    @Override
    public void start(final Stage stage) throws Exception {
        ObservableList<Long> scores = FXCollections.observableArrayList();
        //add a few values to scores...
        scores.add(123456L);
        scores.add(5523426L);
        scores.add(230230478L);

        ListView<Long> listView = new ListView<>(scores);
        listView.setCellFactory(param -> new ListCell<Long>() {
            @Override
            protected void updateItem(Long item, boolean empty) {
                super.updateItem(item, empty);

                if (item != null && !empty) {
                    Calendar calendar = Calendar.getInstance();
                    calendar.setTimeInMillis(item);
                    String formattedText = String.format("%1$tM:%1$tS.%1$tL", calendar);

                    setText(formattedText);
                } else {
                    setText(null);
                }
            }
        });

        listView.setPrefSize(100, 100);

        stage.setScene(new Scene(listView));
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}
How to change Longs saved in a String back to Longs

How to change Longs saved in a String back to Longs


By : user1767873
Date : March 29 2020, 07:55 AM
hop of those help? You can use some built-in String functions to split string. After that you need to do some transformations from string to long for all elements that you get after split step.
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