带有Label.setText的JavaFx2 IllegalStateException [英] JavaFx2 IllegalStateException with Label.setText

问题描述

为什么当我使用像这样的简单线程:

Why when i use a simple Thread like this :

Thread t = new Thread(new Runnable() {
public void run(){
while(true){
  .....
 idLabel.setText(Date.toString);
 Thread.sleep(1000);`
}
t.start(); 

我遇到此错误:

java.lang.IllegalStateException:不在FX应用程序线程上； currentThread =线程4

java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4

但是如果我使用输入文本(例如idInputText)而不是标签，则没有错误?

but if i use an input text (like idInputText) and not a label i didn't have the error ??

推荐答案

JavaFX的所有UI操作都应在FX应用程序线程上执行.您正在创建一个新的Thread t，它不是FX应用程序线程.因此出现异常消息:

All UI operation for JavaFX should be performed on FX application thread. You are creating a new Thread t which is not a FX application thread. Hence the exception message:

java.lang.IllegalStateException:不在FX应用程序线程上； currentThread = Thread-4

java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4

您需要使用 Platform#runLater()方法进行此类操作，如下所示:

You need to use Platform#runLater() method for such operations, like as following:

while(true){
    .....
    Platform.runLater(new Runnable() {
        @Override
        public void run() {
            idLabel.setText(Date.toString);
        }
    });
    Thread.sleep(1000);`
}

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