java.lang.IllegalStateException:不在FX应用程序线程上;currentThread=Thread-4
我试图从线程设置文本对象的字符串,但它给了我以下错误:java.lang.IllegalStateException:不在FX应用程序线程上;currentThread=Thread-4,java,multithreading,javafx,Java,Multithreading,Javafx,我试图从线程设置文本对象的字符串,但它给了我以下错误: Exception in thread "Thread-4" java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4 at com.sun.javafx.tk.Toolkit.checkFxUserThread(Unknown Source) at com.sun.javafx.tk.quantum.QuantumTool
Exception in thread "Thread-4" java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4
at com.sun.javafx.tk.Toolkit.checkFxUserThread(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(Unknown Source)
at javafx.scene.Scene.addToDirtyList(Unknown Source)
at javafx.scene.Node.addToSceneDirtyList(Unknown Source)
at javafx.scene.Node.impl_markDirty(Unknown Source)
at javafx.scene.shape.Shape.impl_markDirty(Unknown Source)
at javafx.scene.Node.impl_geomChanged(Unknown Source)
at javafx.scene.text.Text.impl_geomChanged(Unknown Source)
at javafx.scene.text.Text.needsTextLayout(Unknown Source)
at javafx.scene.text.Text.needsFullTextLayout(Unknown Source)
at javafx.scene.text.Text.access$200(Unknown Source)
at javafx.scene.text.Text$2.invalidated(Unknown Source)
at javafx.beans.property.StringPropertyBase.markInvalid(Unknown Source)
at javafx.beans.property.StringPropertyBase.set(Unknown Source)
at javafx.beans.property.StringPropertyBase.set(Unknown Source)
at javafx.scene.text.Text.setText(Unknown Source)
at uy.com.vincent.fx.handling.TableController$1.run(TableController.java:70)
处理程序类:
@FXML
private Text timer;
@Override
public void initialize(URL url, ResourceBundle rb) {
init();
new Thread() {
public void run() {
while(true) {
Calendar cal = new GregorianCalendar();
int hour = cal.get(cal.HOUR);
int minute = cal.get(cal.MINUTE);
int second = cal.get(cal.SECOND);
int AM_PM = cal.get(cal.AM_PM);
String time = hour + "" + minute + "" + second;
timer.setText(time);
}
}
}.start();
}
我跟在后面。
教程中的家伙没有使用JavaFX
我尝试过使用Platform.runLater()
,它确实有效,但会使我的程序崩溃。
我还尝试在Platform.runLater(new Runnable(){})
方法上创建计时器,但它给出的错误与以前相同。在Platform.runLater()中包装Timer.setText()
。在它的外部,在while循环的内部,添加Thread.sleep(1000)代码>
非法状态异常背后的原因是您试图在JavaFX应用程序线程以外的某些线程上更新UI
当您添加应用程序时,应用程序崩溃的原因是您添加了一个将在UI线程上无限执行的进程,从而使UI线程过载。让线程睡眠1000毫秒将帮助您克服这个问题
如果可能,将while(true)替换为计时器或TimerTask
有关更多选项,请遵循可能重复的,而(true)
是专业人士所说的坏代码。绝对不要使用它,至少检查循环头中的volatile boolean