How to use

concat

method

in

javafx.beans.binding.StringExpression

    .bind(value
        .widthProperty()
        .asString("%.0f").concat(" x ").concat(value.heightProperty().asString("%.0f"))); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
this.fileProperties.getChildren().addAll(
    this.imageSizeLabel, this.imageSizeValue);

    .bind(value
        .widthProperty()
        .asString("%.0f").concat(" x ").concat(value.heightProperty().asString("%.0f"))); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
this.fileProperties.getChildren().addAll(
    this.imageSizeLabel, this.imageSizeValue);

label.textProperty().bind(currentValue.asString("%.0f").concat("/").concat(maxValue.asString("%.0f")));

label.textProperty().bind(currentValue.asString("%.0f").concat("/").concat(maxValue.asString("%.0f")));