我连续十次将系统输出变量“j”的println，但我没有看到任何理由。
这是我的代码：
copyFolderButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
String dateStart = LocalDateTime.now().format(DateTimeFormatter.ofPattern("HH:mm:ss"));
j = 0.00;
ScheduledExecutorService s = Executors.newSingleThreadScheduledExecutor();
s.schedule(new Runnable() {
@Override
public void run() {
List<String> finallist = copyList.getItems();
totalComputersCopy = copyList.getItems().size();
successRateCopy = 0;
double a = 1.00;
double i = (1.00 / finallist.size());
ArrayList<String> selectedIDs = new ArrayList<String>();
try {
for (String row : finallist) {
a++;
j = j + i;
if (a % 10 == 0) {
Thread.sleep(1500);
}
System.out.println(a);
copythread = new Thread("" + a) {
public void run() {
try {
System.out.println(j);
javafx.application.Platform.runLater(() -> copyGauge.setValue(j * 100));
} catch (Exception ex) {
}
Process p;
try {
String pathRaw = copyFolderPath.getText();
pathRaw = pathRaw.replace(":", "$");
if (pathRaw != null && pathRaw.length() > 0 && pathRaw.charAt(pathRaw.length() - 1) == '\\') {
pathRaw = pathRaw.substring(0, pathRaw.length() - 1);
}
String source = copyFolderSource.getText();
if (source != null && source.length() > 0 && source.charAt(source.length() - 1) == '\\') {
source = source.substring(0, source.length() - 1);
}
InetAddress ia = InetAddress.getByName("172.217.23.206");
boolean b = ia.isReachable(2000);
if (b) {
//System.out.println(j*100);
ProcessBuilder builder = new ProcessBuilder("cmd.exe", "/c", "powershell -Command \"Copy-Item '" + source + "' -Destination '" + "\\\\" + row + "\\" + pathRaw + "' -Recurse -Verbose\"");
p = builder.start();
BufferedReader reader = new BufferedReader(new InputStreamReader(p.getErrorStream()));
StringBuilder builders = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
builders.append(line);
builders.append("\n");
}
String DeleteLog = builders.toString();
if (DeleteLog.trim().isEmpty()) {
successRateCopy++;
javafx.application.Platform.runLater(() -> copyFolderLog.appendText(row + ": " + "Succesfully copied" + "\n"));
} else {
javafx.application.Platform.runLater(() -> copyFolderLog.appendText(row + ": " + DeleteLog + "\n"));
}
p.waitFor(15, TimeUnit.SECONDS);
p.destroy();
} else {
javafx.application.Platform.runLater(() -> copyFolderLog.appendText("Cannot reach " + row + "\n"));
System.out.println("Cannot reach " + row + "\n");
}
} catch (IOException ex) {
Logger.getLogger(FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex);
System.out.println(ex.toString());
} catch (InterruptedException ex) {
Logger.getLogger(FXMLDocumentController.class.getName()).log(Level.SEVERE, null, ex);
} finally {
Thread.currentThread().interrupt();
}
}
};
copythread.start();
}
} catch (Exception e) {
} finally {
while (copythread.getState() != Thread.State.TERMINATED) {
}
String successRateLog = String.valueOf(successRateCopy);
String failedRateLog = String.valueOf(totalComputersCopy - successRateCopy);
String dateStop = LocalDateTime.now().format(DateTimeFormatter.ofPattern("HH:mm:ss"));
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
Date d1 = null;
Date d2 = null;
try {
d1 = format.parse(dateStart);
d2 = format.parse(dateStop);
//in milliseconds
long diff = d2.getTime() - d1.getTime();
long diffSeconds = diff / 1000 % 60;
long diffMinutes = diff / (60 * 1000) % 60;
long diffHours = diff / (60 * 60 * 1000) % 24;
if ((diff / (60 * 60 * 1000) % 24) != 0) {
deleteTime = "Total time: " + String.valueOf(diffHours) + " hours, " + String.valueOf(diffMinutes) + " minutes, " + String.valueOf(diffSeconds) + " seconds";
} else {
if ((diff / (60 * 1000) % 60) != 0) {
deleteTime = "Total time: " + String.valueOf(diffMinutes) + " minutes, " + String.valueOf(diffSeconds) + " seconds";
} else {
if ((diff / 1000 % 60) != 0) {
deleteTime = "Total time: " + String.valueOf(diffSeconds) + " seconds";
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
Platform.runLater(() -> {
VBox container = new VBox();
container.setPadding(new Insets(10, 10, 10, 10));
Label icon = new Label();
Image image = new Image(getClass().getResourceAsStream("img/copyicon.png"));
icon.setGraphic(new ImageView(image));
container.getChildren().add(icon);
Notifications.create()
.darkStyle()
.title("Copy Folder")
.text("Workcomplete!" + "\n" + deleteTime + "\n" + "Success: " + successRateLog + "\n" + "Failed: " + failedRateLog)
.hideAfter(Duration.seconds(30))
.graphic(container)
.show();
}
);
}
}
}, 1, TimeUnit.SECONDS);
}
});
我不确定这是如何使用线程的最佳方法。它运行良好，但我知道在我的代码中打印变量有什么问题，它看起来像这样：
2.0
3.0
4.0
5.0
6.0
0.03333333333333333
7.0
0.04
0.04
0.04
0.04666666666666667
8.0
9.0
0.060000000000000005
0.060000000000000005
0.060000000000000005
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
0.12666666666666668
0.12666666666666668
0.12666666666666668
0.12666666666666668
0.12666666666666668
0.12666666666666668
0.12666666666666668
0.12666666666666668
0.12666666666666668
0.12666666666666668
“A”打印正常，但“j”增长到十行并保持不变。