JList - 选择多个项目 [英] JList - select multiple items

问题描述

我想在 JList 中遇到这个 setSelectedValue（）方法的问题，当我想在a中选择多个值时 JList 自动，它仍然只选择一个。有办法吗？

I faced a problem with this setSelectedValue() method in JList when I wanted to select multiple values in a JList automatically, it still selected only one. Is there a way?

 String[] items = { "Item 1", "Item 2", "Item 3", "Item 4" };
      final JList theList = new JList(items);
      theList.setSelectedValue("Item 1",true);
      theList.setSelectedValue("Item 2",true);

此代码仅显示第2项已选中。

推荐答案

调用后使用 JList.setSelectedIndices（int []） JList.setSelectionMode（ListSelectionModel.MULTIPLE_INTERVAL_SELECTION）。

import javax.swing.*;
import java.io.*;
import java.util.ArrayList;
class MultiSelectList {
    public static void main(String[] args) throws Exception {
        File f = new File("MultiSelectList.java");
        InputStream is = new FileInputStream(f);
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        final ArrayList<String> lines = new ArrayList<String>();
        String line = br.readLine();
        while (line!=null) {
            lines.add(line);
            line = br.readLine();
        }
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JList list = new JList(lines.toArray());
                list.setSelectionMode(
                    ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
                int[] select = {19, 20, 22};
                list.setSelectedIndices(select);
                JOptionPane.showMessageDialog(null, new JScrollPane(list));
            }
        });
    }
}

屏幕截图

Screen Shot

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