java - 将 JComboBox 中的项目替换为数组

Question

我想知道是否有一种简单的方法可以做到这一点。我试图从武器组合框中删除项目(成功)，然后将数组添加到组合框中，就像第一次实例化时一样。我不想只是创建和复制一个新的，因为已经根据喜好设置了 body 约束。这是代码...

import org.apache.commons.lang3.ArrayUtils;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import javax.swing.border.Border;

public class TestGui extends JFrame {
    private final String[] guiCharSelDefault = {"---  Select Character ---"};
    private final String[] characters = {"charOne", "charTwo", "charThree", "charFour"};
    private final String[] GuiCharSel = (String[]) ArrayUtils.addAll(guiCharSelDefault, characters);
    private final String[] weapon = {"Weapon"};
    private final String[][] allWeapons = {
            {
                    "weakWeaponOne", "strongWeaponOne", "shortWeaponOne", "longWeaponOne"
            },
            {
                    "weakWeaponTwo", "strongWeaponTwo", "shortWeaponTwo", "longWeaponTwo"
            },
            {
                    "weakWeaponThree", "strongWeaponThree", "shortWeaponThree", "longWeaponThree"
            },
            {
                    "weakWeaponFour", "strongWeaponFour", "shortWeaponFour", "longWeaponFour"
            }
    };
    private JComboBox charCombo = new JComboBox(GuiCharSel);
    private JComboBox weaponsCombo = new JComboBox(weapon);
    private JPanel centerFrame = createCenterFrame();

    //**************************************************************************************

    private GridBagConstraints setGbc(int gridx, int gridy, int ipadx, int ipady, String anchorLocation, double weightx, double weighty, Insets insets){
        GridBagConstraints gbc = new GridBagConstraints();

        if (anchorLocation.toUpperCase().equals("NORTHWEST")){
            gbc.anchor = GridBagConstraints.NORTHWEST;
        } else if (anchorLocation.toUpperCase().equals("NORTH")){
            gbc.anchor = GridBagConstraints.NORTH;
        } else if (anchorLocation.toUpperCase().equals("NORTHEAST")){
            gbc.anchor = GridBagConstraints.NORTHEAST;
        } else if (anchorLocation.toUpperCase().equals("WEST")){
            gbc.anchor = GridBagConstraints.WEST;
        } else if (anchorLocation.toUpperCase().equals("EAST")){
            gbc.anchor = GridBagConstraints.EAST;
        } else if (anchorLocation.toUpperCase().equals("SOUTHWEST")){
            gbc.anchor = GridBagConstraints.SOUTHWEST;
        } else if (anchorLocation.toUpperCase().equals("SOUTH")){
            gbc.anchor = GridBagConstraints.SOUTH;
        } else if (anchorLocation.toUpperCase().equals("SOUTHEAST")){
            gbc.anchor = GridBagConstraints.SOUTHEAST;
        } else {
            gbc.anchor = GridBagConstraints.CENTER;
        }

        gbc.gridx = gridx;
        gbc.gridy = gridy;
        gbc.ipadx = ipadx;
        gbc.ipady = ipady;
        gbc.weightx = weightx;
        gbc.weighty = weighty;
        gbc.insets = insets;

        return gbc;
    }

    private Insets setInsets(int top, int left, int bottom, int right){
        Insets insets = new Insets(top,left,bottom,right);
        return insets;
    }

    //**************************************************************************************

    private JPanel createCenterFrame(){
        JPanel pnl = new JPanel();
        Border raisedBevel = BorderFactory.createRaisedBevelBorder();
        Border loweredBevel = BorderFactory.createLoweredBevelBorder();
        Border compound = BorderFactory.createCompoundBorder(raisedBevel, loweredBevel);

        pnl.setBorder(compound);

        charCombo.addActionListener(
                new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        String charName = ((JComboBox)(e.getSource())).getSelectedItem().toString();
                        if (charName.equals("charOne")){
                            weaponsCombo.removeAllItems();
                            weaponsCombo.addItem(allWeapons[1]); // <---- Help Please!!!
                        }
                    }
                }
        );
        pnl.add(charCombo, setGbc(0,0, 0, 0, "NORTHWEST", 0, 0, setInsets(0, 10, 0, 0)));
        pnl.add(weaponsCombo, setGbc(0,0, 0, 0, "NORTHWEST", 0, 0, setInsets(0, 10, 0, 0)));

        return pnl;
    }

    TestGui(){
        add(centerFrame, BorderLayout.CENTER);

        setSize(800,600);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    //**************************************************************************************

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

第 95 行( // <---- Help Please!!! )是我想知道是否有一种简单的方法可以做到这一点的地方。问题是，当您在 GUI 的字符组合框中选择“charOne”时，您会看到一个奇怪的语言字符串，而不是武器组合框中的 4 种武器列表。

Answer 1

简单的解决方案就是简单地替换ComboBoxModel...

if (charName.equals("charOne")) {
    DefaultComboBoxModel<String> model = new DefaultComboBoxModel<>(allWeapons[1]);
    weaponsCombo.setModel(model);
}

参见How to Use Combo Boxes了解更多详情