有没有办法缩短由于对象的相似属性而重复的代码？

Question

我有很多复选框，所有这些都依赖于某个未被选中的框，但是如果它被选中，则必须选中并隐藏这些框。我知道人们一直在说 ArrayList，但是我不知道如何编辑 ArrayList 中项目的某些属性的语法。

我的代码有效，我只需要缩短此代码，因为我相信如果它继续运行这样，它最终会减慢进程，我想了解它是如何工作的我拥有的其他对象也是如此。

 public void cbxSalesSelectA() {
    boolean t = cbx_SALES_Select_All.getText().equals("Select All");
    cbx_SALESQtySold.setSelected(t);
    cbx_SALESDateSold.setSelected(t);
    cbx_SALESCustomer.setSelected(t);
    cbx_SALESDiscount.setSelected(t);
    cbx_SALESLineNumber.setSelected(t);
    cbx_SALESConsultant.setSelected(t);
    cbx_SALES_Header_Row.setSelected(t);
    if (t) {
        cbx_SALES_Select_All.setText("Deselect All");
    } else {
        cbx_SALES_Select_All.setText("Select All");
    }
}
 public void cbxLOCSelectA() {
    boolean t = cbx_LOC_Select_All.getText().equals("Select All");
    cbx_LOCHeight.setSelected(t);
    cbx_LOCWidth.setSelected(t);
    cbx_LOCDepth.setSelected(t);
    cbx_LOCWeightCap.setSelected(t);
    cbx_LOCAccessibility.setSelected(t);
    cbx_LOC_Header_Row.setSelected(t);
    if (t) {
        cbx_LOC_Select_All.setText("Deselect All");
    } else {
        cbx_LOC_Select_All.setText("Select All");
    }
}

Answer 1

如果您使用 ArrayList 或复选框对象数组，您只需使用循环运行遍历所有复选框并根据需要选中或取消选中它们。

例如，

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ComboBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

import java.util.ArrayList;
import java.util.List;

public class Example  extends Application {


    @Override
    public void start(Stage primaryStage) throws Exception {
        // Creating an ArrayList here and adding all the checkboxes required. In your
        // case you'd add your existing checkboxes
        List<CheckBox> list = new ArrayList<>();
        list.add(new CheckBox());
        list.add(new CheckBox());
        list.add(new CheckBox());
        list.add(new CheckBox());

        // this combobox controls whether or not all checkboxes are selected
        ComboBox<String> comboBox = new ComboBox<>();

        // two options to either select all or deselect all checkboxes
        comboBox.setItems(FXCollections.observableArrayList("Select All", "Deselect All"));

        // container to hold all the controls
        VBox vBox = new VBox();
        vBox.getChildren().add(comboBox);
        vBox.getChildren().addAll(list);

        // this is the important bit
        // if the combobox selection is changed, then this fires
        comboBox.setOnAction(event -> {
            // if the selected option is select all, then a for-each loop is used to make all the 
            // checkboxes in the arraylist checked and vice versa if the deselect option is selected
            if (comboBox.getSelectionModel().getSelectedItem().equalsIgnoreCase("Select All")) {
                for (CheckBox checkBox : list) checkBox.setSelected(true);
            } else {
                for (CheckBox checkBox : list) checkBox.setSelected(false);
            }
        });

        primaryStage.setScene(new Scene(vBox));
        primaryStage.setTitle("Example");
        primaryStage.setWidth(600);
        primaryStage.setHeight(400);
        primaryStage.show();
    }
}

希望对您有所帮助。

Answer 2

我不认为您真的可以提高代码的性能，但为了提高可读性，您可以在单独的方法中对 selected 进行更改。例如

static void allSetSelected(boolean isSelected, CheckBox... boxes ) {
    Arrays.stream(boxes).forEach(b -> b.setSelected(isSelected));
}

并像这样在您的代码中使用它

public void cbxSalesSelectA() {
    boolean t = cbx_SALES_Select_All.getText().equals("Select All");
    allSetSelected(t, cbx_SALESQtySold,
                      cbx_SALESDateSold,
                      cbx_SALESCustomer,
                      cbx_SALESDiscount,
                      cbx_SALESLineNumber,
                      cbx_SALESConsultant,
                      cbx_SALES_Header_Row)
    if (t) {
        cbx_SALES_Select_All.setText("Deselect All");
    } else {
        cbx_SALES_Select_All.setText("Select All");
    }
}

public void cbxLOCSelectA() {
    boolean t = cbx_LOC_Select_All.getText().equals("Select All");
    allSetSelected(t, cbx_LOCHeight, cbx_LOCWidth, cbx_LOCDepth, cbx_LOCWeightCap, cbx_LOCAccessibility, cbx_LOC_Header_Row);
    if (t) {
        cbx_LOC_Select_All.setText("Deselect All");
    } else {
        cbx_LOC_Select_All.setText("Select All");
    }
}

有没有办法缩短由于对象的相似属性而重复的代码？

Is there a way to shorten code that is duplicated because of similiar properties of objects?

java

arraylist

code-duplication

javafx-8