1

现在我无法弄清楚是什么导致了这个问题。

我写了一个小的(也许很傻!)字典程序,它加载一个序列化的哈希映射对象(其中存储了词义对)并显示用户输入的词的含义。

最初我让它完全加载对象然后显示 GUI,但加载对象需要 3 秒,所以我认为显示 gui 并让用户输入单词会更好,同时对象单独加载线程,如果用户更快地键入单词(即在加载对象之前),则会出现一个对话框,显示“正在加载..”,并且在加载对象并向用户显示含义时关闭。

问题是 - 只出现对话框,消息 - “正在加载......”没有出现,好像它是透明的......

继承人的代码:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.io.*;

class Dict implements Runnable {

    HashMap hm = null;
    JTextField ji;
    JTextArea jo;
    JFrame jfobj;

    public void run() {
        try {
            FileInputStream fis = new FileInputStream("serialhm");
            ObjectInputStream ois = new ObjectInputStream(fis);
            Thread.currentThread().sleep(3000);// on an average it takes 3 secs to read the object, i made it sleep because the serialhm file i provided has only one word - "break"
            hm = (HashMap) ois.readObject();
            ois.close();
        } catch (Exception e) {

            System.exit(0);
        }
    }

    public void print_meaning() {
        final JDialog dial = new JDialog();
        dial.setEnabled(true);
        dial.setModal(false);
        dial.setSize(200, 200);
        dial.setLocationRelativeTo(null);
        dial.getContentPane().add(new JLabel("loading......please wait"));
        dial.pack();
        if (hm == null) {

            dial.setVisible(true);//is not showing the message,only the dialog box is shown
            while (true) {
                if (hm != null) {
                    dial.setVisible(false);
                    dial.dispose();
                    break;
                }
            }
        }

        String word = ji.getText();
        String meaning = "";
        ArrayList al1 = (ArrayList) hm.get(word);
        if (al1 == null) {
            JOptionPane.showMessageDialog(jfobj, "word unavailable");
            ji.setText("");
            jo.setText("");

        } else {
            for (int i = 0; i < al1.size(); i++) {
                meaning = meaning + "\n" + (String) al1.get(i);
            }

            jo.setText(meaning + "\n");
            ji.selectAll();
        }

    }

    public void gui() {
        jfobj = new JFrame();
        Font font1 = new Font(Font.SERIF, Font.PLAIN, 17);

        jo = new JTextArea(15, 30);
        jo.setEditable(false);
        jo.setFont(font1);
        jo.setLineWrap(true);
        jo.setWrapStyleWord(true);

        JScrollPane scrollPane = new JScrollPane(jo, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

        ji = new JTextField(30);
        ji.setFont(font1);


        GridBagLayout gridBag = new GridBagLayout();
        Container contentPane = jfobj.getContentPane();
        contentPane.setLayout(gridBag);

        GridBagConstraints gridCons1 = new GridBagConstraints();
        gridCons1.gridwidth = GridBagConstraints.REMAINDER;
        gridCons1.fill = GridBagConstraints.HORIZONTAL;
        contentPane.add(ji, gridCons1);

        GridBagConstraints gridCons2 = new GridBagConstraints();
        gridCons2.weightx = 1.0;
        gridCons2.weighty = 1.0;
        contentPane.add(scrollPane, gridCons2);

        ji.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent evt) {
                print_meaning();
            }
        });
        jfobj.addWindowListener(new WindowAdapter() {

            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        jfobj.pack();
        jfobj.setVisible(true);
    }

    public static void main(String[] args) throws Exception {

        Dict dobj = new Dict();
        Thread t = new Thread(dobj);
        t.start();
        dobj.gui();

    }
}

这是具有序列化哈希图对象的文件('serialhm'): http ://www.mediafire.com/?rc5nda0qs8891xv

为简单起见,它只是一个单字哈希图,而这本词典中唯一的词是 - “break”

另外,请原谅我糟糕的设计。谢谢。

如果有人需要完整的 hashmap 对象序列化文件,我也会上传,它有 203000 字。

4

1 回答 1

0

好的,将while(true)块移动到一个新线程并进行细微更改,现在它很好,完全按照我的意愿运行。

于 2012-05-30T14:14:51.540 回答