我用Swing编写了一些小型Java程序。当我通过Netbeans运行它们时它们工作正常,但是当我在Netbeans之外运行它们时,Swing元素部分或根本不渲染。
以下是比较:
通过Netbeans:
Netbeans之外:
当帧出现时会出现一些问题,而当我将光标移到元素上时会出现其他问题。主要问题是文本没有渲染,按钮文本,边框和背景随机出现和消失。框架的边框不是问题。这两个屏幕截图之间的区别仅仅是Windows 7中清晰帧的结果以及我在制作屏幕截图时在程序下打开的窗口。
以下是GUI代码的简化版本减去事件处理和程序逻辑:
package alarmclock;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class AlarmClockGUI {
private JFrame frame;
private JButton onOffButton;
private JComboBox<String> alarmList;
private JLabel remainingTime, currentTime,
alarmTime;
private final EventHandler eventHandler; //Handles GUI events
private final boolean time24Mode = false; //Indicates 24H (true) or 12H (false) time
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
AlarmClockGUI acg = new AlarmClockGUI();
}
});
}
public AlarmClockGUI() {
eventHandler = new EventHandler(); //Handles GUI events
createFrameOptions();
}
class EventHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
//Code added here
}
}
private void updateTimeDisplay() {
String tempTime = String.format("%tT", new Date());
if (time24Mode) {
currentTime.setText(tempTime);
} else {
currentTime.setText(String.format("%tr", new Date()));
}
}
private void createFrameOptions() {
frame = new JFrame("Alarm Clock");
frame.getContentPane().add(createMainPanel());
createTimer(); //must follow main panel creation
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(true);
frame.pack();
frame.setLocationRelativeTo(null); //Centers frame. Must follow pack()
frame.setVisible(true);
}
private JPanel createTimePanel() {
JPanel timePanel = new JPanel(new GridBagLayout());
remainingTime = new JLabel("00:00:00", SwingConstants.CENTER);
remainingTime.setFont(
remainingTime.getFont().deriveFont(36.0f));
remainingTime.setPreferredSize(new Dimension(164, 80));
remainingTime.setOpaque(true);
remainingTime.setBorder(
BorderFactory.createTitledBorder("Remaining Time"));
currentTime = new JLabel(String.format("%tT", new Date()),
SwingConstants.CENTER);
currentTime.setFont(
currentTime.getFont().deriveFont(16.0f));
currentTime.setPreferredSize(new Dimension(164, 40));
currentTime.setOpaque(false);
currentTime.setBorder(
BorderFactory.createTitledBorder("Current Time"));
alarmTime = new JLabel("00:00:00", SwingConstants.CENTER);
alarmTime.setFont(
alarmTime.getFont().deriveFont(16.0f));
alarmTime.setPreferredSize(new Dimension(164, 40));
alarmTime.setOpaque(false);
alarmTime.setBorder(
BorderFactory.createTitledBorder("Alarm Time"));
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.gridheight = 2;
c.fill = GridBagConstraints.VERTICAL;
timePanel.add(remainingTime, c);
c.gridx = 1;
c.gridheight = 1;
c.fill = GridBagConstraints.NONE;
timePanel.add(currentTime, c);
c.gridy = 1;
timePanel.add(alarmTime, c);
return timePanel;
}
private JComboBox createAlarmList() {
alarmList = new JComboBox<>();
alarmList.addActionListener(eventHandler);
alarmList.setActionCommand("List");
alarmList.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
return alarmList;
}
private JPanel createButtonPanel() {
JPanel buttonPanel = new JPanel();
onOffButton = createButton("Alarm Off", eventHandler);
onOffButton.setPreferredSize(new Dimension(88, 26));
buttonPanel.add(createButton("New Alarm", eventHandler));
buttonPanel.add(createButton("Edit", eventHandler));
buttonPanel.add(onOffButton); //Not anonymous; button text changes
buttonPanel.add(createButton("Delete", eventHandler));
return buttonPanel;
}
private JButton createButton(String buttonName, ActionListener al) {
JButton b = new JButton(buttonName);
b.setActionCommand(buttonName);
b.addActionListener(al);
return b;
}
private JPanel createMainPanel() {
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.PAGE_AXIS));
mainPanel.add(createTimePanel());
mainPanel.add(Box.createRigidArea(new Dimension(10, 10)));
mainPanel.add(createAlarmList());
mainPanel.add(Box.createRigidArea(new Dimension(0, 10)));
mainPanel.add(createButtonPanel());
mainPanel.setBorder(
BorderFactory.createEmptyBorder(10, 10, 10, 10));
return mainPanel;
}
private void createTimer() {
Timer timer = new Timer(1000, eventHandler);
timer.setActionCommand("Timer");
timer.setInitialDelay(0);
timer.start();
}
}
我刚刚将JRE更新为最新版本(问题也在此之前发生),Netbeans正在使用与我的系统其余部分相同的JRE。
有没有人对我的程序在Netbeans之外错误呈现的原因有所了解?
---更新---------------------
我尝试按照建议设置外观,但这没有帮助。
答案 0 :(得分:3)
经过一些研究后,我发现这个问题可能与在JRE上设置某些系统属性或在程序中明确相关。具体来说,我能够添加:
System.setProperty("sun.java2d.noddraw", "true");
到主方法,这解决了我的问题。我在程序中显式设置了属性,这样我就可以通过双击jar文件来运行程序。从控制台启动JVM时,也可以将此属性设置为标志:
-Dsun.java2d.noddraw =真
事实证明,Netbeans使用那个确切的属性启动JVM,这解释了为什么它在Netbeans中运行良好,但不在其中。
类似的问题被称为here,而here就是甲骨文所说的财产。显然,该属性可以在JVM上显式设置为标志,但是我没有太多运气让它在我的机器上工作,所以我已经在程序中设置了它。