小编Jon*_*oin的帖子

    mainFrame.addWindowListener(new WindowListener() {

        @Override
        public void windowClosing(WindowEvent e) {
            if (JOptionPane.showConfirmDialog(mainFrame, "Are you sure you want to quit?", "Confirm exit.", JOptionPane.OK_OPTION, 0, new ImageIcon("")) != 0) {
                return;
            }
            System.exit(-1);
        }

        @Override 
        public void windowOpened(WindowEvent e) {}

        @Override 
        public void windowClosed(WindowEvent e) {}

        @Override 
        public void windowIconified(WindowEvent e) {}

        @Override 
        public void windowDeiconified(WindowEvent e) {}

        @Override 
        public void windowActivated(WindowEvent e) {}

        @Override 
        public void windowDeactivated(WindowEvent e) {}

    });

有我的代码,是否可能,因为我只使用windowClosing方法删除我的情况下的所有其他方法,无用的方法,所以它占用更少的空间？

例

    mainFrame.addWindowListener(new WindowListener() {

        @Override
        public void windowClosing(WindowEvent e) {
            if …

我一直在调整 CSS 几个小时，但我已经放弃了。我不知道如何删除选项卡顶部的间距。请帮忙！

CSS：

.tab-pane {
    -fx-tab-min-height: 3em;
    /* 24 */

    -fx-tab-max-height: 3em;
    /* 24 */
}
.tab .tab-label {
    -fx-background-color: transparent;
    -fx-alignment: CENTER;
    -fx-text-fill: #EBEAF0;
}
.tab {
    -fx-background-insets: 0.0;
    -fx-background-radius: 0.0;
    -fx-background-color: #17181B;
}
.tab:selected {
    -fx-background-color: #21477A;
}
.tab:focused {
    -fx-focus-color: transparent;
}
.tab {
    -fx-padding: 0 30 0 30;
}
.tab-pane *.tab-header-background {
    -fx-background-color: #17181B;
}
.tab-pane:top *.tab-header-area {
    -fx-background-insets: 0, 0 0 1 0;
    -fx-padding: 0.416667em 0.166667em 0.0em 0.0em;
}
.tab:selected .focus-indicator {
    -fx-focus-color: transparent; …

这是绘制GUI的地方(注意,该类扩展了JFrame).

public Cache() {
    SubstanceColorChooserUI col = new SubstanceColorChooserUI();
    while (mode == 0);
    setResizable(false);
    setTitle("Cache");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 483, 374);
    setLocationRelativeTo(null);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(new BorderLayout());

    textField = new JTextField();
    textField.setBounds(10, 11, 328, 20);
    contentPane.add(textField);
    textField.setColumns(10);

    JButton btnLoadCache = new JButton("Load cache");
    btnLoadCache.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            try {
                String loc = textField.getText();
                if (loc.equals("")) {
                    JOptionPane.showMessageDialog(Cache.this, "Please specify a location for the cache.", "Unable to load", JOptionPane.ERROR_MESSAGE);
                    return;
                } …

我正在制作一个用Java编辑图像的程序.我想知道是否可以将图像从用户桌面拖到JPanel图像上,然后将拖动的图像设置为背景JPanel.这可能在Java中吗？如果是这样,我该怎么做？

我正在尝试将JProgressBar添加到我的程序中,但它不会更新!只有在100%的原因后,该值才会更改.这是我的方法.

public void downloadImages(List<String> images) {
    if (errorCode == 0) {
        for (int i = 0; i < images.size(); i++) {
            if (errorCode == 0) {
                main.progressLabel.setText("Downloading image " + Integer.toString(i + 1) + " of " + Integer.toString(images.size()));
                String imageStr = images.get(i);
                String imageName = imageStr.substring(imageStr.lastIndexOf("/") + 1);
                try {
                    URL url = new URL(imageStr);
                    InputStream in = url.openStream();
                    OutputStream out = new FileOutputStream(saveDirectory + imageName);

                    byte[] b = new byte[2048];
                    int length;
                    while ((length = in.read(b)) != -1) …

我试图在我的主页上写一些代码来检查用户是否登录。这是代码块

            <div class="navbar-collapse collapse">
                <asp:LoginView runat="server" ViewStateMode="Disabled">
                    <% 

                    if (Session["UserID"] == null) {
                    %>
                    <AnonymousTemplate>
                        <ul class="nav navbar-nav navbar-right">
                            <li><a runat="server" href="~/Account/Register">Register</a></li>
                            <li><a runat="server" href="~/Account/Login">Log in</a></li>
                        </ul>
                    </AnonymousTemplate>
                    <%
                    } else  { 
                    %>
                    <LoggedInTemplate>
                        <ul class="nav navbar-nav navbar-right">
                            <li><a runat="server" href="~/Account/Manage" title="Manage your account">Hello, <%: Session["UserID"] %>!</a></li>
                            <li>
                                <asp:LoginStatus runat="server" LogoutAction="Redirect" LogoutText="Log off" LogoutPageUrl="~/" OnLoggingOut="Unnamed_LoggingOut" />
                            </li>
                        </ul>
                    </LoggedInTemplate>
                    <%
                    }
                    %>
                </asp:LoginView>
            </div>

我开始对使用Java制作动画(幻灯片,背景等)感兴趣.我知道JavaFX做得好多了,但我只是顽固地打扰转换.

这是我到目前为止所得到的.

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Random;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class BlurredLightCells extends JPanel {

    private static final long serialVersionUID = 4610174943257637060L;

    private Random random = new Random();

    private ArrayList<LightCell> lightcells;

    private float[] blurData = new float[500];

    public static void main(String[] args) {
        JFrame frame = new JFrame("Swing animated bubbles");
        frame.setSize(1000, 750);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(new BlurredLightCells(60));

        frame.setVisible(true);
    }

    public BlurredLightCells(int amtOfBCells) { …

从字节数组创建String时遇到问题,在构造字符串时忽略数组内的0值.我怎样才能使它如果字节值为0,String只是添加一个空格而不是删除它.

例如,这是输出DT_TestTracelineCTestTraceli.

public static void main(String[] args) {
    byte[] text = {68, 84, 95, 84, 101, 115, 116, 84, 114, 97, 99, 101, 108, 105, 110, 101, 0, 0, 0, 0, 67, 84, 101, 115, 116, 84, 114, 97, 99, 101, 108, 105};
    System.out.println(new String(text));
}

我怎么能这样做,所以我可以使用制表符分隔这两个字符串或使用空格,以便输出 DT_TestTraceline CTestTraceli

谢谢

可能重复:
Python中的三元条件运算符

我已经用Java编程了很长一段时间,我在学校学习Python,我记得在Java中你可以做一个布尔表达式

布尔值？(如果布尔值为true,则会发生这种情况):(如果布尔值为false,则会发生这种情况)

他们是用Python编写上述Java代码的方法吗？上面的陈述恰当地称为什么？

好吧,我正在为我的服务器制作一个客户端并且JMenu工作正常,直到我添加了applet,现在当我点击菜单查看下拉菜单时,它没有显示.我假设它隐藏在applet后面,但我无法解决它

public class Loader extends JApplet implements Serializable, ActionListener {

private static final long serialVersionUID = 7639088664641445302L;

private static final HashMap<String, String> THEME_LIST = new HashMap<String, String>();

private final String[] THEME_NAMES = { "Magma", "Emerald", "Raven", "Black Steel", "Challenger", "Sahara", "Silver", "Blue" };

public Properties params = new Properties();
public JFrame mainframe;
public JPanel mainpanel = new JPanel();

public static boolean useIsaac = false;

private static Robot robot;

private static final String HOME = System.getProperty("user.home") + "\\";

public …

所以今天我了解了kotlin中的num.inc()功能,并决定在我的代码中实现它.不用说,这为我的代码增加了10倍的延迟时间(从~400ms到4000 + ms)

这是我传统方式的例子(i ++,400ms)

package com.beaudoin

import java.io.BufferedWriter
import java.io.FileInputStream
import java.io.FileWriter
import java.nio.channels.FileChannel

fun main(args: Array<String>) {
    val s = System.currentTimeMillis()

    val channel = FileInputStream("client.dll").channel
    val buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size())
    val data = ByteArray(buffer.capacity())
    buffer.get(data)

    val writer = BufferedWriter(FileWriter("dump.txt", false))
    val bytes = ByteArray(16)

    var offset = 0
    var i = 0
    while (i < data.size) {
        for (j in bytes.indices) {
            bytes[j] = data[i++]
        }
        writer.write(HexRow(offset, bytes).toString())
        writer.newLine()
        offset += 16
    }

    writer.close()

    println(System.currentTimeMillis() - s) …