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我正在處理查詢數據庫並將該信息拖到已添加到JFrame的幾個JPanel上的應用程序。每隔30秒，我將一個人的可見性設置爲false，另一個人在JFrame中將其設置爲true，以替換顯示的人。Java JPanel不會出現在Linux中的JFrame中
該應用程序在Windows中運行得非常漂亮，但是當我將它放在我的Ubuntu機器上時（運行XFCE和openjdk-7-jre），面板不顯示出來。 JFrame中的其他組件確實出現，但我不確定發生了什麼問題。再次，程序在Windows中正確運行，但不是Ubuntu。
我試圖削減我的代碼，將自己編譯和運行的東西，但我知道我的代碼是一團糟。我幾乎沒有做過Java編程，所以我很抱歉所有這些都會變得醜陋！我也刪除了數據庫的東西，因爲這是工作，因此你不必看到。
感謝任何能指引我朝着正確方向的人！
package productivityDisplay;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Display implements ActionListener {
// Sizing constants
public boolean trimNames = false; // if true, trims to 10 characters (use
// this if something is cut off)
int refreshRate = 600000; // Refresh rate for Data (milliseconds)
int margin = 2;
int labelHeight = 76;
Font defaultFont = new Font("Tahoma", Font.PLAIN, 50);
Color DodgerBlue = new Color(30, 144, 255);
Color OrangeRed = new Color(255, 69, 0);
Color DarkGreen = new Color(0, 100, 0);
// End Sizing constants
// Controls
private JLabel lblCountDown;
public int countDown;
private Timer refresh;
private JFrame frame;
private JLabel lblCurrTime;
private JPanel pnlGrind1, pnlGrind2;
private JLabel lblWeekSummary, lblRepairCredit,
lblRepair2Count, lblCustom1, lblCustom2,
lblQC, lblRepair, lblRepair2;
@SuppressWarnings("rawtypes")
private JComboBox cmbTeamNames;
// End Controls
// Data Variables
private int currentTeam;
// End Data Variables
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
Display window = new Display(1); // Attempts to show
// the
// window
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
throw new Error("Yeah, it's broken.");
}
}
});
}
public Display(int team) {
initialize();
cmbTeamNames.setSelectedIndex(team);
getData();
}
/**
* @wbp.parser.entryPoint
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
private void initialize() {
frame = new JFrame();
frame.setVisible(true);
frame.setExtendedState(frame.getExtendedState() | JFrame.MAXIMIZED_BOTH); // Maximize
// Window
int width = frame.getWidth();
int height = frame.getHeight();
//frame.setResizable(true); // Can't be resized
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setLayout(null);
// MASSIVE CHUNK OF LAYOUT CODE //
String[] strTeamNames = { "", "Grinding", "Finishing" };
cmbTeamNames = new JComboBox(strTeamNames); // Combo Box (Grinding,
// finishing)
cmbTeamNames.setFont(new Font("Tahoma", Font.PLAIN, 40));
cmbTeamNames.setBounds(20, 11, 297, 67);
frame.getContentPane().add(cmbTeamNames);
cmbTeamNames.setName("cmbTeamNames");
cmbTeamNames.addActionListener(this);
lblCurrTime = new JLabel("Clock");
lblCurrTime.setFont(new Font("Tahoma", Font.PLAIN, 99));
lblCurrTime.setBounds((width - 350), 11, 300, 100);
frame.getContentPane().add(lblCurrTime);
countDown = 0;
lblCountDown = new JLabel("Next update in: "+countDown);
lblCountDown.setFont(new Font("Tahoma", Font.PLAIN, 40));
lblCountDown.setBounds(cmbTeamNames.getX() + cmbTeamNames.getWidth()
+ 40, 20, 400, 50);
frame.getContentPane().add(lblCountDown);
// Grinding Layout 2
pnlGrind2 = new JPanel();
pnlGrind2.setBounds(20, 89, (width - 50), height - 130);
frame.getContentPane().add(pnlGrind2);
pnlGrind2.setLayout(null);
pnlGrind2.setBorder(BorderFactory.createLineBorder (Color.blue, 2));
// Column1
JSeparator separator = new JSeparator();
separator.setBounds(0, (labelHeight + margin - 1), 300, 10);
pnlGrind2.add(separator);
// End Column1
// Column2
int leftSet = 450;
JSeparator separator2 = new JSeparator();
separator2.setBounds(leftSet, (labelHeight + margin - 1), 200, 10);
pnlGrind2.add(separator2);
// End Column2
// Column3
leftSet = 750;
JSeparator separator3 = new JSeparator();
separator3.setBounds(leftSet, (labelHeight + margin - 1), 200, 10);
pnlGrind2.add(separator3);
// End Column3
// Bottom rows
lblRepair2 = new JLabel("Repair Credit:");
pnlGrind2.add(lblRepair2);
lblRepair2.setFont(defaultFont);
lblRepair2.setForeground(DodgerBlue);
lblRepair2Count = new JLabel("");
lblRepair2Count.setBounds(lblRepair2.getX() + lblRepair2.getWidth()
+ margin, lblRepair2.getY(), 515, labelHeight);
pnlGrind2.add(lblRepair2Count);
lblRepair2Count.setFont(defaultFont);
lblRepair2Count.setForeground(DodgerBlue);
// End Bottom rows
pnlGrind2.setVisible(false);
pnlGrind2.setBackground(new Color(0, 0, 204)); // Used to see panel
// better
// End Grinding Layout 2
// Grinding Layout 1
pnlGrind1 = new JPanel();
pnlGrind1.setBounds(20, 89, (width - 50), height - 130);
frame.getContentPane().add(pnlGrind1);
pnlGrind1.setLayout(null);
pnlGrind1.setBorder(BorderFactory.createLineBorder (Color.blue, 2));
pnlGrind1.setVisible(false);
pnlGrind1.setBackground(new Color(255, 0, 204)); // Used to see panel
// better
// Left Side
lblWeekSummary = new JLabel("Week Summary (Measured at Buffing)");
lblWeekSummary.setBounds(0, 0, 515, 37);
pnlGrind1.add(lblWeekSummary);
lblWeekSummary.setFont(new Font("Tahoma", Font.PLAIN, 30));
// Spacing
lblCustom1 = new JLabel("Custom:");
lblCustom1.setBounds(0,
lblWeekSummary.getY() + (lblWeekSummary.getHeight() + margin)
* 2, 515, labelHeight);
pnlGrind1.add(lblCustom1);
lblCustom1.setFont(defaultFont);
lblCustom1.setForeground(OrangeRed);
lblRepairCredit = new JLabel("Repair Credit:");
lblRepairCredit.setBounds(0,
lblCustom1.getY() + (lblCustom1.getHeight() + margin), 515,
labelHeight);
pnlGrind1.add(lblRepairCredit);
lblRepairCredit.setFont(defaultFont);
lblRepairCredit.setForeground(DodgerBlue);
// Spacing
lblQC = new JLabel("QC");
lblQC.setBounds(
0,
(int) (lblRepairCredit.getY() + (lblRepairCredit.getHeight() + margin) * 1.5),
515, labelHeight);
pnlGrind1.add(lblQC);
lblQC.setFont(defaultFont);
lblQC.setForeground(DarkGreen);
lblCustom2 = new JLabel("Custom:");
lblCustom2.setBounds(0, lblQC.getY() + (lblQC.getHeight() + margin),
515, labelHeight);
pnlGrind1.add(lblCustom2);
lblCustom2.setFont(defaultFont);
lblCustom2.setForeground(DarkGreen);
lblRepair = new JLabel("Repair:");
lblRepair.setBounds(0, lblCustom2.getY()
+ (lblCustom2.getHeight() + margin), 515, labelHeight);
pnlGrind1.add(lblRepair);
lblRepair.setFont(defaultFont);
lblRepair.setForeground(DarkGreen);
// End Left Side
// Right Side
// End Right Side
// End Grinding Layout 1
// END MASSIVE CHUNK OF LAYOUT CODE //
frame.pack();
frame.setExtendedState(frame.getExtendedState() | JFrame.MAXIMIZED_BOTH); // Maximize
// Window
}
// Thread classes
public void getData() {
ActionListener updateData = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
pnlGrind1.repaint();
pnlGrind2.repaint();
countDown = 15;
}
};
refresh = new Timer(refreshRate, updateData);
refresh.start();
}
// End Thread Classes
public void actionPerformed(ActionEvent e) { // Combo box to select team was
// clicked
int team;
team = cmbTeamNames.getSelectedIndex();
currentTeam = team;
countDown=600;
int t2Interval = 5000;
if (team == 1) { // Grinding team
pnlGrind1.setVisible(true);
}
ActionListener alternatePnl = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
// updateData();
alternatePanel(cmbTeamNames.getSelectedIndex());
}
};
new Timer(t2Interval, alternatePnl).start();
}
void alternatePanel(int team) {
if (team == 1) { // If Grinding team
if (pnlGrind1.isVisible()) {
pnlGrind1.setVisible(false);
pnlGrind2.setVisible(true);
} else {
pnlGrind2.setVisible(false);
pnlGrind1.setVisible(true);
}
}
}
}
第一個提示，現在@mKorbel已經吸引了我的注意力 - ***使用佈局。*** –
1）不要使用'null' /'絕對'佈局。使用適當的[LayoutManager]（http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html）並在「JFrame」上調用'pack（）'，然後將其設置爲可見。 2）不要在類上實現'ActionListener'，除非它將用作其他類的監聽器，但我懷疑不要使用'DISPOSE_ON_CLOSE'，除非是爲了某個目的，而是'EXIT_ON_CLOSE' –
@AndrewThompson，好的，我會看看使用佈局。我一直使用絕對定位，因爲它只能在兩臺機器上運行，兩臺機器的窗口大小相同，所以佈局靈活性不在我的優先級列表中。 – snyderxc