JAVA学习——javax.swing.*;

最新推荐文章于 2024-02-14 02:10:16 发布

nietsche

最新推荐文章于 2024-02-14 02:10:16 发布

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文章标签： java string import button class object

本文链接：https://blog.youkuaiyun.com/nietsche/article/details/1833461

本文介绍了一个使用 Java Swing 的 JList 控件创建简单图形界面应用的例子。该程序演示了如何设置 JList 的布局方向，并监听列表选择变化来更新界面。

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    What I did all day was just one programme:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class ListTest
{
    public static void main(String[] args)
    {
        JFrame frame = new ListFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

class ListFrame extends JFrame
{
    private static final int DEFAULT_WIDTH = 400;
    private static final int DEFAULT_HEIGHT = 300;
    private JPanel listPanel;
    private JLabel label ;
    private JList wordList;
    private JPanel buttonPanel ;
    private ButtonGroup group;
    private String prefix = "The ";
    private String suffix = "for jumps over the lazy dog.";

    public ListFrame()
    {
        setTitle("ListTest");
        setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);

        String words[] =
        {
            "quick","brown","hungry","wild","silent",
                "huge","private","abstract","static","final"
        };

        wordList = new JList(words);
        wordList.setVisibleRowCount(4);
        JScrollPane scrollPane = new JScrollPane(wordList);

        listPanel = new JPanel();
        listPanel.add(scrollPane);
        wordList.addListSelectionListener(
            new ListSelectionListener()
        {
            public void valueChanged(ListSelectionEvent e)
            {
                Object[] values = wordList.getSelectedValues();
                StringBuilder text = new StringBuilder(prefix);
                for ( int i = 0 ; i < values.length ; i++ )
                {
                    String word = (String) values[i];
                    text.append(word);
                    text.append(" ");
                }
                text.append(suffix);

                label.setText(text.toString());
            }
        });

        buttonPanel = new JPanel();
        group = new ButtonGroup();
        makeButton ("Vertival",JList.VERTICAL);
        makeButton("Vertical Wrap",JList.VERTICAL_WRAP);
        makeButton("Horizontal Wrap",JList.HORIZONTAL_WRAP);

        add(listPanel,BorderLayout.NORTH);
        label = new JLabel(prefix+suffix);
        add(label,BorderLayout.SOUTH);
    }

    private void makeButton(String label, final int orientation)
    {
        JRadioButton button = new JRadioButton(label);
        buttonPanel.add(button);
        if (group.getButtonCount() == 0)
        {
            button.setSelected(true);
        }
        group.add(button);
        button.addActionListener( new
            ActionListener()
        {
            public void actionPerformed(ActionEvent e )
            {
                wordList.setLayoutOrientation(orientation);
                listPanel.revalidate();
            }
        });
    }
}