JComboBox项目列表 [英] JComboBox Item List

问题描述

我想知道如何在JComboBox中更改项目列表的名称？这是我的代码
我想将其更改为Dog，Panda，bee。而不是选择他们的路径。

I am wondering how would I change the name of the item list in my JComboBox?here's my code I want to change it to Dog, Panda, bee. rather than choosing their path.

import java.awt.FlowLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JFrame;
import javax.swing.ImageIcon;
import javax.swing.Icon;
import javax.swing.JLabel;
import javax.swing.JComboBox;

public class ComboTest {

    private JLabel imageLabel;
    private JComboBox comboImage;

    private String[] names = {"images/dog.gif","images/bee.gif","images/Panda.gif"};
    private Icon[] icons = {
        new ImageIcon(getClass().getResource(names[0])),
        new ImageIcon(getClass().getResource(names[1])),
        new ImageIcon(getClass().getResource(names[2])),
    };

    public ComboTest(){
        initComponents();
    }

    public void initComponents(){
        JFrame frame = new JFrame("Test Combo");
        frame.setVisible(true);
        frame.setSize(320, 160);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());

        comboImage = new JComboBox(names);
        comboImage.addItemListener(new ItemListener(){
            public void itemStateChanged(ItemEvent event){
                if(event.getStateChange() == ItemEvent.SELECTED){
                    imageLabel.setIcon(icons[comboImage.getSelectedIndex()]);
                }
            }
        });

        frame.add(comboImage);
        imageLabel = new JLabel(icons[0]);
        frame.add(imageLabel);
    }
}

推荐答案

你可能想要创建一个具有两个属性的对象，即要显示的路径和文本。

You probably want to make an object with two properties, the path and the text you want to display.

然后你将设置 toString 返回text属性的方法。免责声明：我尚未测试任何此代码。

Then you'll set the toString method to return the text property. Disclaimer: I haven't tested any of this code.

public class ValueText {
   private String text;
   private String value;

   public ValueText(final String text, final String value) {
      this.text = text;
      this.value = value;
   }

   @Override
   public String toString() {
      return text;
   }

   public String getValue() {
      return value;
   }
}

然后你可以将你的初始数组更改为：

Then you can change your initial array to something like:

private Object[] names = {
   new ValueText("Dog", "images/dog.gif"),
   new ValueText("Bee", "images/bee.gif"),
   new ValueText("Panda", "images/Panda.gif")
};

它应该类似，只是现在，当您检查所选项目时，您可以使用 getValue（）获取路径的方法。

And it should work similarly, only now, when you are inspecting the selected item, you can use the getValue() method to get the path.

您可能也对自定义渲染器感兴趣，但它可能是没有必要为您的使用：
的http：//文档.oracle.com / javase / tutorial / uiswing / components / combobox.html #renderer

You also might be interested in a custom renderer, but it's probably not necessary for your use: http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html#renderer

更新我会继续在kleopatra在评论中提出了一些令人信服的论据之后做了更正，你应该在下面阅读。

Update I'll go ahead and make a correction after kleopatra made some convincing arguments in the comments, which you should read below.

一个更通用，更清晰的方法是使用自定义渲染器，即使它非常简单（见上面的链接）。

A more general purpose and cleaner way of doing this is with a custom renderer, even if it's very simple (see link above).

这篇关于JComboBox项目列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！