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++ // Copyright (C) 2026 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include <QApplication>
++ #include <QFont>
++ #include <QHBoxLayout>
++ #include <QJniObject>
++ #include <QtJniTypes>
++ #include <QLabel>
++ #include <QPushButton>
++ #include <QWidget>
++
++ #include "dataexchanger.h"
++ #include "otherlanguagehandler.h"
++
++ int main(int argc, char *argv[])
++ {
++ QApplication a(argc, argv);
++
++ QWidget widget;
++ QLabel label = QLabel("Click a button to send data\nto the other language");
++ QFont font = label.font();
++ font.setPointSize(20);
++ label.setFont(font);
++
++ QLabel fromOtherLabel;
++ QFont fromOtherFont = fromOtherLabel.font();
++ fromOtherFont.setPointSize(16);
++ fromOtherLabel.setFont(fromOtherFont);
++
++ QPushButton javaButton;
++ javaButton.setText("Hello Java!");
++ javaButton.setFont(font);
++ javaButton.setFixedSize(QSize(150, 50));
++
++ QPushButton kotlinButton;
++ kotlinButton.setText("Hello Kotlin!");
++ kotlinButton.setFont(font);
++ kotlinButton.setFixedSize(QSize(150, 50));
++
++ QVBoxLayout mainLayout;
++ QVBoxLayout labelLayout;
++
++ labelLayout.addWidget(&label);
++ labelLayout.addWidget(&fromOtherLabel);
++ labelLayout.setAlignment(Qt::AlignHCenter);
++ mainLayout.addLayout(&labelLayout);
++
++ QHBoxLayout buttonsLayout;
++ buttonsLayout.addWidget(&kotlinButton);
++ buttonsLayout.addWidget(&javaButton);
++ buttonsLayout.setAlignment(Qt::AlignCenter);
++ mainLayout.addLayout(&buttonsLayout);
++ widget.setLayout(&mainLayout);
++
++ DataExchanger dataExchanger;
++
++ //! [Connect button signals]
++ QObject::connect(&javaButton, &QPushButton::clicked, &javaButton, [&]() {
++ dataExchanger.fromCpp(DataExchanger::Java, "Hello!");
++ });
++
++ QObject::connect(&kotlinButton, &QPushButton::clicked, &kotlinButton, [&]() {
++ dataExchanger.fromCpp(DataExchanger::Kotlin, "Hello!");
++ });
++ QObject::connect(&dataExchanger, &DataExchanger::fromOther,
++ &dataExchanger, [&](const QString& str) {
++ fromOtherLabel.setText(str);
++ });
++ //! [Connect button signals]
++
++ OtherLanguageHandler otherHandler(&dataExchanger);
++ widget.show();
++ return a.exec();
++ }
++