如何在groovy中创建一个组合框

Question

你能告诉我为什么这在 Groovy 脚本中不起作用吗？
我正在尝试找到最接近我需要的一段代码并对其进行编辑，但它会提示错误。该脚本在java中运行良好，至少网站上是这么说的。 https://docs.oracle.com/javase/tutorial/uiswing/examples/layout/GridLayoutDemoProject/src/layout/GridLayoutDemo.java

我正在尝试从 SOAPUI 运行它

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class GridLayoutDemo extends JFrame {
    static final String gapList[] = {"0", "10", "15", "20"};
    final static int maxGap = 20;
    JComboBox horGapComboBox;
    JComboBox verGapComboBox;
    JButton applyButton = new JButton("Apply gaps");
    GridLayout experimentLayout = new GridLayout(0,2);

    public GridLayoutDemo(String name) {
        super(name);
        setResizable(false);
    }

    public void initGaps() {
        horGapComboBox = new JComboBox(gapList);
        verGapComboBox = new JComboBox(gapList);
    }

    public void addComponentsToPane(final Container pane) {
        initGaps();
        final JPanel compsToExperiment = new JPanel();
        compsToExperiment.setLayout(experimentLayout);
        JPanel controls = new JPanel();
        controls.setLayout(new GridLayout(2,3));

        //Set up components preferred size
        JButton b = new JButton("Just fake button");
        Dimension buttonSize = b.getPreferredSize();
        compsToExperiment.setPreferredSize(new Dimension((int)(buttonSize.getWidth() * 2.5)+maxGap,
                (int)(buttonSize.getHeight() * 3.5)+maxGap * 2));

        //Add buttons to experiment with Grid Layout
        compsToExperiment.add(new JButton("Button 1"));
        compsToExperiment.add(new JButton("Button 2"));
        compsToExperiment.add(new JButton("Button 3"));
        compsToExperiment.add(new JButton("Long-Named Button 4"));
        compsToExperiment.add(new JButton("5"));

        //Add controls to set up horizontal and vertical gaps
        controls.add(new Label("Horizontal gap:"));
        controls.add(new Label("Vertical gap:"));
        controls.add(new Label(" "));
        controls.add(horGapComboBox);
        controls.add(verGapComboBox);
        controls.add(applyButton);

        //Process the Apply gaps button press
        applyButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                //Get the horizontal gap value
                String horGap = (String)horGapComboBox.getSelectedItem();
                //Get the vertical gap value
                String verGap = (String)verGapComboBox.getSelectedItem();
                //Set up the horizontal gap value
                experimentLayout.setHgap(Integer.parseInt(horGap));
                //Set up the vertical gap value
                experimentLayout.setVgap(Integer.parseInt(verGap));
                //Set up the layout of the buttons
                experimentLayout.layoutContainer(compsToExperiment);
            }
        });
        pane.add(compsToExperiment, BorderLayout.NORTH);
        pane.add(new JSeparator(), BorderLayout.CENTER);
        pane.add(controls, BorderLayout.SOUTH);
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method is invoked from the
     * event dispatch thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        GridLayoutDemo frame = new GridLayoutDemo("GridLayoutDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Set up the content pane.
        frame.addComponentsToPane(frame.getContentPane());
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        /* Use an appropriate Look and Feel */
        try {
            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
        } catch (UnsupportedLookAndFeelException ex) {
            ex.printStackTrace();
        } catch (IllegalAccessException ex) {
            ex.printStackTrace();
        } catch (InstantiationException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
        /* Turn off metal's use of bold fonts */
        UIManager.put("swing.boldMetal", Boolean.FALSE);

        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

Answer 1

下次请提及您遇到的错误。

虽然大多数 Java 语法都支持 1:1，但并非所有 Java 语法都支持。
实际上，一行中有两件事在 Groovy 中是不支持的。

1. 不支持非常罕见的（在 Java 中）String gapList[] 语法，应改为 String[] gapList。

2. Groovy 不支持像 {"0", "10", "15", "20"} 这样的数组初始化语法，相反，您需要编写一个列表文字并将其转换为像 ["0", "10", "15", "20"] as String[] 这样的数组类型。实际上，由于您要分配的变量是类型化的，因​​此甚至可以隐式进行强制转换，因此 ["0", "10", "15", "20"] 就足够了。

所以替换

static final String gapList[] = {"0", "10", "15", "20"};

通过

static final String[] gapList = ["0", "10", "15", "20"];

你应该很高兴。