我正在创建一个可视化排序的程序，我的代码似乎还不错。但是，当我运行它时，它似乎并没有更新GUI。
我已经尝试过验证和重新验证，它的确改变了GUI，但是它大部分只是破坏了它。
public void createWindow(Container win) {
bars = new JPanel();
bars.setLayout(new GridBagLayout());
c = new GridBagConstraints();
startup = true;
updateBars();
startup = false;
bars.setBackground(Color.GRAY);
bars.setBorder(BorderFactory.createMatteBorder(4, 4, 4, 2, Color.BLACK));
win.setLayout(new GridBagLayout());
c.gridx = 0;
c.gridy = 0;
c.gridheight = 2;
c.gridwidth = 3;
Dimension d2 = new Dimension(325, 250);
bars.setPreferredSize(d2);
bars.setMaximumSize(d2);
bars.setSize(d2);
win.add(bars, c);
JPanel sorts = new JPanel();
sorts.setBackground(Color.GRAY);
sorts.setBorder(BorderFactory.createMatteBorder(4, 2, 2, 4, Color.BLACK));
JLabel sortPrompt = new JLabel("Choose a sort: ");
sortPrompt.setFont(sortPrompt.getFont().deriveFont(14.0f));
sortPrompt.setHorizontalAlignment(SwingConstants.LEFT);
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 1;
c.gridheight = 1;
sorts.add(sortPrompt, c);
String sortNames[] = {"Bogo Sort", "Gnome Sort", "Insertion Sort", "Slow sort"};
JComboBox sortAlgs = new JComboBox(sortNames);
sortAlgs.setFont(sortAlgs.getFont().deriveFont(14.0f));
sortAlgs.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sortChosen = (String)(sortAlgs.getSelectedItem());
System.out.println(sortChosen);
}
});
c.gridx = 1;
c.gridy = 1;
c.gridwidth = 1;
c.gridheight = 1;
sorts.add(sortAlgs, c);
JLabel delayPrompt = new JLabel("Choose a delay time: ");
delayPrompt.setFont(delayPrompt.getFont().deriveFont(13.0f));
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 3;
sorts.add(delayPrompt, c);
String delays[] = {"1", "2", "3", "4", "5", "10", "25", "50", "100"};
JComboBox delayTimes = new JComboBox(delays);
delayTimes.setFont(delayTimes.getFont().deriveFont(13.0f));
delayTimes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
delayTime = Integer.valueOf((String)(delayTimes.getSelectedItem()));
}
});
c.gridx = 1;
c.gridy = 2;
sorts.add(delayTimes, c);
JButton start = new JButton("Start");
start.setFont(start.getFont().deriveFont(16.0f));
start.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sortCompleted = 0;
while (sortCompleted != 1) {
startBogoSort();
}
}
});
c.gridwidth = 1;
c.gridx = 0;
c.gridheight = 1;
c.gridy = 3;
sorts.add(start, c);
JButton stop = new JButton("Stop");
stop.setFont(stop.getFont().deriveFont(16.0f));
stop.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sortCompleted = 1;
}
});
c.gridwidth = 1;
c.gridx = 1;
c.gridheight = 1;
c.gridy = 3;
sorts.add(stop, c);
c.gridx = 3;
c.gridy = 0;
c.gridheight = 2;
c.gridwidth = 2;
Dimension d3 = new Dimension(250, 250);
sorts.setPreferredSize(d3);
win.add(sorts, c);
}
public void updateBars() {
n = 10;
arr = new ArrayList<Integer>(n);
for (int i = 0; i < n; i++) {
arr.add(i + 1);
}
if (startup == true) {
Collections.shuffle(arr);
}
int maxHeight = 0;
for (int i = 0; i < arr.size(); i++) {
int height = arr.get(i);
if (height > maxHeight) {
maxHeight = height;
}
int yPos = n - height * 20;
Rectangle r = new Rectangle();
r.setBounds(i * 20, (yPos * 2) + ((height / 2) * 20), 20, height * 20);
if (i == 0) {
if (arr.get(i) > arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
} else if (arr.get(i) < arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, Color.BLACK));
}
} else if (i == arr.size() - 1) {
if (arr.get(i - 1) > arr.get(i)) {
r.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 1, Color.BLACK));
} else if (arr.get(i - 1) < arr.get(i)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
}
} else {
if (arr.get(i - 1) > arr.get(i) && arr.get(i) > arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 1, Color.BLACK));
} else if (arr.get(i - 1) < arr.get(i) && arr.get(i) > arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
} else if (arr.get(i - 1) > arr.get(i) && arr.get(i) < arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 0, Color.BLACK));
} else if (arr.get(i - 1) < arr.get(i) && arr.get(i) < arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, Color.BLACK));
}
}
c.gridheight = height;
c.ipadx = 20;
c.ipady = height * 20;
c.anchor = GridBagConstraints.SOUTH;
c.gridy = n - height;
bars.add(r, c);
}
}
public void startBogoSort() {
while (sortCompleted != 1) {
int totalSize = arr.size() - 1;
for (int i = 1; i < totalSize; i++) {
if (arr.get(i - 1) > arr.get(i)) {
sortCompleted = 0;
i = totalSize + 1;
} else {
sortCompleted = 1;
}
}
if (sortCompleted == 0) {
bars.removeAll();
Collections.shuffle(arr);
}
}
}
抱歉，有些混乱，但是应该显示一个面板，其中包含需要排序的条形图，并且应该显示它随着时间的推移对条形图进行排序（延迟尚未实现，但我至少应该看到最后一个结果）。但是，实际上发生的是它当前冻结了。就像我之前说过的那样，我尝试了validate（）和revalidate（）方法，但它们似乎只是在进一步破坏代码。
答案 0 :(得分：0)
我发现了这种情况下的错误。我需要在我的updateBars（）方法中创建GridBagConstraints和GridBagLayout的新实例。另外，我使用TimerTask和Timer来更新GUI。原来，这是比我最初想的要简单得多的解决方案。
这是我更新的代码：
public void createWindow(Container win) {
bars = new JPanel();
c = new GridBagConstraints();
startup = true;
updateBars();
startup = false;
bars.setBackground(Color.GRAY);
bars.setBorder(BorderFactory.createMatteBorder(4, 4, 4, 2, Color.BLACK));
win.setLayout(new GridBagLayout());
c.gridx = 0;
c.gridy = 0;
c.gridheight = 2;
c.gridwidth = 3;
bars.setBounds(0, 0, 325, 200);
c.fill = c.VERTICAL;
win.add(bars, c);
JPanel sorts = new JPanel();
sorts.setLayout(new GridBagLayout());
sorts.setBackground(Color.GRAY);
sorts.setBorder(BorderFactory.createMatteBorder(4, 2, 4, 4, Color.BLACK));
JLabel sortPrompt = new JLabel("Choose a sort: ");
sortPrompt.setFont(sortPrompt.getFont().deriveFont(15.0f));
c.ipady = 20;
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 2;
c.gridheight = 1;
sorts.add(sortPrompt, c);
String sortNames[] = {"Bogo Sort", "Gnome Sort", "Insertion Sort", "Bubble Sort"};
JComboBox sortAlgs = new JComboBox(sortNames);
sortAlgs.setFont(sortAlgs.getFont().deriveFont(15.0f));
sortAlgs.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sortChosen = (String)(sortAlgs.getSelectedItem());
System.out.println(sortChosen);
}
});
c.anchor = GridBagConstraints.WEST;
c.ipady = 20;
c.gridx = 2;
c.gridy = 0;
c.gridwidth = 1;
c.gridheight = 1;
sorts.add(sortAlgs, c);
JLabel delayPrompt = new JLabel("Choose a delay time: ");
delayPrompt.setFont(delayPrompt.getFont().deriveFont(15.0f));
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 2;
c.anchor = GridBagConstraints.CENTER;
sorts.add(delayPrompt, c);
String delays[] = {"1", "2", "3", "4", "5", "10", "25", "50", "100", "500", "1000"};
JComboBox delayTimes = new JComboBox(delays);
delayTimes.setFont(delayTimes.getFont().deriveFont(15.0f));
delayTimes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
delayTime = Integer.valueOf((String)(delayTimes.getSelectedItem()));
System.out.println(delayTime);
}
});
c.anchor = GridBagConstraints.WEST;
c.gridx = 2;
c.gridy = 1;
c.gridwidth = 1;
sorts.add(delayTimes, c);
JButton start = new JButton("Start");
start.setFont(start.getFont().deriveFont(15.0f));
start.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sortCompleted = 0;
if (sortChosen.equals(null)) {
sortChosen= "Bogo Sort";
}
if (sortChosen.equals("Bogo Sort")) {
startBogoSort();
} else if (sortChosen.equals("Insertion Sort")) {
startInsertionSort();
} else if (sortChosen.equals("Bubble Sort")) {
startBubbleSort();
} else if (sortChosen.equals("Gnome Sort")) {
System.out.println("This sort is not implemented yet");
}
}
});
c.gridwidth = 1;
c.gridx = 0;
c.gridheight = 1;
c.gridy = 3;
c.anchor = GridBagConstraints.CENTER;
sorts.add(start, c);
JButton shuffle = new JButton("Shuffle");
shuffle.setFont(shuffle.getFont().deriveFont(15.0f));
shuffle.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
TimerTask shuffleTask = new TimerTask () {
public void run() {
bars.removeAll();
Collections.shuffle(arr);
updateBars();
bars.revalidate();
}
};
Timer shuffler = new Timer();
shuffler.schedule(shuffleTask, 10);
}
});
c.gridwidth = 1;
c.gridx = 1;
c.gridheight = 1;
c.gridy = 3;
sorts.add(shuffle, c);
JButton stop = new JButton("Stop");
stop.setFont(stop.getFont().deriveFont(15.0f));
stop.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (sortChosen.equals("Bogo Sort")) {
bogo.cancel();
bogo.purge();
} else if (sortChosen.equals("Bubble Sort")) {
bubble.cancel();
bubble.purge();
}
}
});
c.gridwidth = 1;
c.gridx = 2;
c.gridheight = 1;
c.gridy = 3;
sorts.add(stop, c);
blank = new JLabel(" ");
c.gridx = 1;
c.gridy = 5;
c.gridwidth = 2;
sorts.add(blank, c);
c.gridx = 3;
c.gridy = 0;
c.gridheight = 2;
c.gridwidth = 2;
Dimension d3 = new Dimension(360, bars.getHeight());
sorts.setPreferredSize(d3);
win.add(sorts, c);
}
public void updateBars() {
bars.setLayout(new GridBagLayout());
c = new GridBagConstraints();
if (startup == true) {
n = 10;
arr = new ArrayList<Integer>(n);
for (int i = 0; i < n; i++) {
arr.add(i + 1);
}
}
int maxHeight = 0;
for (int i = 0; i < arr.size(); i++) {
int height = arr.get(i);
if (height > maxHeight) {
maxHeight = height;
}
int yPos = n - height * 20;
Rectangle r = new Rectangle();
r.setBounds(i * 20, (yPos * 2) + ((height / 2) * 20), 20, height * 20);
if (i == 0) {
if (arr.get(i) > arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
} else if (arr.get(i) < arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, Color.BLACK));
}
} else if (i == arr.size() - 1) {
if (arr.get(i - 1) > arr.get(i)) {
r.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 1, Color.BLACK));
} else if (arr.get(i - 1) < arr.get(i)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
}
} else {
if (arr.get(i - 1) > arr.get(i) && arr.get(i) > arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 1, Color.BLACK));
} else if (arr.get(i - 1) < arr.get(i) && arr.get(i) > arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.BLACK));
} else if (arr.get(i - 1) > arr.get(i) && arr.get(i) < arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 0, 1, 0, Color.BLACK));
} else if (arr.get(i - 1) < arr.get(i) && arr.get(i) < arr.get(i + 1)) {
r.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 0, Color.BLACK));
}
}
c.gridheight = height;
c.ipadx = 20;
c.ipady = height * 20;
c.anchor = GridBagConstraints.SOUTH;
c.gridy = n - height;
bars.add(r, c);
}
}
public void startBogoSort() {
if (delayTime == 0) {
delayTime = 1;
}
TimerTask bogoTask = new TimerTask() {
public void run() {
blank.setText(" ");
for (int i = 1; i < arr.size(); i++) {
if (arr.get(i - 1) > arr.get(i)) {
sortCompleted = 0;
i = arr.size() + 1;
} else {
sortCompleted = 1;
}
}
if (sortCompleted == 0) {
bars.removeAll();
Collections.shuffle(arr);
updateBars();
bars.revalidate();
} else {
blank.setText("Sort Completed");
bogo.cancel();
bogo.purge();
}
}
};
bogo.scheduleAtFixedRate(bogoTask, 0, delayTime);
}