How to use method from other Class

I have a simple question for prof and hard for me :-)

I have tableView in 3 differ classes and I have 2 methods which should be initialized every time when App is started.

Is is possible to create that 2 methods without Class declaration /make it static and use it like in initialization. Example below.

public class Subscriber {

private StringProperty number;
private StringProperty addr;

public Subscriber() {
this(null, null);
}
....
}


This is example of my class which use Subscriber

FirstClass(){

@FXML
private void initialize() {
tableView.getSelectionModel().setCellSelectionEnabled(true);
tableView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
numberCol.setCellValueFactory(
cellData -> cellData.getValue().numberProperty());
addrCol.setCellValueFactory(
cellData -> cellData.getValue().addrProperty());
}


And that method I use in each of this and other 2 classes to get possibility to copy defferent Cell in TableView

public void copySelectionToClipboard(final TableView<Subscriber> table) {
final Set<Integer> rows = new TreeSet<>();
final StringBuilder strb = new StringBuilder();
boolean firstRow = true;
boolean firstCol = true;

for (final TablePosition tablePosition : table.getSelectionModel().getSelectedCells()) {
rows.add(tablePosition.getRow());

}

for (final TableColumn<Subscriber, ?> column : table.getColumns()) {
if (!firstCol) {
strb.append('n');

}
firstCol = false;

for (final Integer row : rows) {
if (!firstRow) {
strb.append('t');
}
firstRow = false;

if (table.getSelectionModel().isSelected(row, column)) {
final Object cellData = column.getCellData(row);
strb.append(cellData == null ? "" : cellData.toString());
}
}
}
final ClipboardContent clipboardContent = new ClipboardContent();
clipboardContent.putString(strb.toString());
Clipboard.getSystemClipboard().setContent(clipboardContent);
}


Is it chance to use that method in Subscriber class ?

P.S: Of course I know, I can create static copySelectionToClipboard(){}
or can create Subscriber subscriber in each class, but I`m looking for some any decision.

enum

TableView<?>

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