我有一个实现Initializable的类.
public abstract class ExampleClass implements Initializable {
public void ExampleClass() {
// Load FXML
}
@Override
public void initialize(URL location, ResourceBundle resources) {
// Initialize stuff
}
public void afterInitialize() {
// Do things that are reliant upon the FXML being loaded
}
}
然后,我扩展这个抽象类:
public class ExampleSubclass extends ExampleClass {
public ExampleSubclass() {
super(/* real code has params */);
this.afterInitialize(); // Problem here
}
}
但是,当我调用afterInitialize()时,它的行为就像抽象类中的FXML尚未加载.这使我感到困惑,因为我先调用了super()构造函数,所以我认为FXML应该已经加载了.
我究竟做错了什么?
提前致谢.
解决方法:
根据这个answer,初始化方法的调用不会在构造函数中发生,而是在它之后发生.因此,当您在子类的构造函数中调用afterInitialize时,实际上是在初始化之前调用了它!
In a few words: The constructor is called first, then any @FXML
annotated fields are populated, then initialize() is called…
因此,在调用initialize时,所有FXML元素均已加载,并且如其他建议那样,您可以在initialize方法内部调用afterInitialize,但是如果您不想这样做,则可以使用@PostConstruct批注:
public abstract class ExampleClass implements Initializable {
public void ExampleClass() {
// Load FXML
}
@Override
public void initialize(URL location, ResourceBundle resources) {
// Initialize stuff
}
@PostConstruct
public void afterInitialize() {
// Do things that are reliant upon the FXML being loaded
}
}
public class ExampleSubclass extends ExampleClass {
public ExampleSubclass() {
super(/* real code has params */);
}
@PostConstruct
@Override
public void afterInitialize() {
super.afterInitialize();
// other things
}
}