如何在图形用户界面中获取textEdit的文本内容

from PyQt5.QtWidgets import QApplication, QMainWindow, QTextEdit

app = QApplication([])
window = QMainWindow()
textEdit = QTextEdit()
window.setCentralWidget(textEdit)
window.show()

# 获取textEdit的文本内容
text = textEdit.toPlainText()
print(text)

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        TextArea textArea = new TextArea();
        VBox root = new VBox(textArea);
        Scene scene = new Scene(root, 300, 200);
        primaryStage.setScene(scene);
        primaryStage.show();

        // 获取textArea的文本内容
        String text = textArea.getText();
        System.out.println(text);
    }

    public static void main(String[] args) {
        launch(args);
    }
}