问如何在javafx的tableview单元格文本域中用一个单词替换另一个单词？

EN

public void onClickSearch(ActionEvent event) {
    String st=srep.getText();
    //sbtn.setOnAction((ActionEvent event1) -> {
    tc_source.setCellFactory((column) -> {

        return new TableCell<File, String>() {
            @Override
            protected void updateItem(String item, boolean empty) {
                super.updateItem(item, empty);
                if (item == null || empty) {
                    setGraphic(null);
                    setText(null);
                    setStyle("");
                }
                else {

                    if (!srep.getText().isEmpty() && item.toLowerCase().contains(srep.getText().toLowerCase())) {
                        Double rowHeight = this.getTableRow().getHeight();
                        setGraphic(buildTextFlow(item ,srep.getText()));
                        setHeight(rowHeight);
                        setContentDisplay(ContentDisplay.GRAPHIC_ONLY);
                    }
                    else {
                        setText(item);
                        setTextFill(javafx.scene.paint.Color.BLACK);
                        setStyle("");
                        setContentDisplay(ContentDisplay.TEXT_ONLY);
                    }


                }

            }

            public TextFlow buildTextFlow(String text, String filter) {
                int filterLength = filter.length();
                if (filterLength == 0) {
                    return new TextFlow(createNormalText(text));
                }                   Font font = Font.font("Italic", 12);
                java.awt.Color color= java.awt.Color.BLUE ;
                TextFlow t = new TextFlow();
                String lowerText = text.toLowerCase();
                filter = filter.toLowerCase();
                int index1 = 0;
                int matchIndex=0;
                while ((matchIndex = lowerText.indexOf(filter, index1)) != -1) {
                    if (index1 != matchIndex) {
                        t.getChildren().add(createNormText(text.substring(index1, matchIndex)));
                    }
                    index1 = matchIndex + filterLength;
                    t.getChildren().add(createText(text.substring(matchIndex, index1), color));
                }
                if (index1 != text.length()) {
                    t.getChildren().add(createNormText(text.substring(index1)));
                }
                return t;
            }
        };
    });

}