public final class javafx.beans.value.WeakChangeListener<T> implements javafx.beans.value.ChangeListener<T>, javafx.beans.WeakListener
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: javafx.beans.value.WeakChangeListener
  super_class: java.lang.Object
{
  private final java.lang.ref.WeakReference<javafx.beans.value.ChangeListener<T>> ref;
    descriptor: Ljava/lang/ref/WeakReference;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/ref/WeakReference<Ljavafx/beans/value/ChangeListener<TT;>;>;

  public void <init>(javafx.beans.value.ChangeListener<T>);
    descriptor: (Ljavafx/beans/value/ChangeListener;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // javafx.beans.value.WeakChangeListener this
        start local 1 // javafx.beans.value.ChangeListener listener
         0: .line 63
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 64
            aload 1 /* listener */
            ifnonnull 3
         2: .line 65
            new java.lang.NullPointerException
            dup
            ldc "Listener must be specified."
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 67
      StackMap locals: javafx.beans.value.WeakChangeListener javafx.beans.value.ChangeListener
      StackMap stack:
            aload 0 /* this */
            new java.lang.ref.WeakReference
            dup
            aload 1 /* listener */
            invokespecial java.lang.ref.WeakReference.<init>:(Ljava/lang/Object;)V
            putfield javafx.beans.value.WeakChangeListener.ref:Ljava/lang/ref/WeakReference;
         4: .line 68
            return
        end local 1 // javafx.beans.value.ChangeListener listener
        end local 0 // javafx.beans.value.WeakChangeListener this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    5     0      this  Ljavafx/beans/value/WeakChangeListener<TT;>;
            0    5     1  listener  Ljavafx/beans/value/ChangeListener<TT;>;
    Signature: (Ljavafx/beans/value/ChangeListener<TT;>;)V
    RuntimeVisibleParameterAnnotations: 
      0:
        javafx.beans.NamedArg(value = "listener")
    MethodParameters:
          Name  Flags
      listener  

  public boolean wasGarbageCollected();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javafx.beans.value.WeakChangeListener this
         0: .line 75
            aload 0 /* this */
            getfield javafx.beans.value.WeakChangeListener.ref:Ljava/lang/ref/WeakReference;
            invokevirtual java.lang.ref.WeakReference.get:()Ljava/lang/Object;
            ifnonnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // javafx.beans.value.WeakChangeListener this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Ljavafx/beans/value/WeakChangeListener<TT;>;

  public void changed(javafx.beans.value.ObservableValue<? extends T>, T, );
    descriptor: (Ljavafx/beans/value/ObservableValue;Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=5, args_size=4
        start local 0 // javafx.beans.value.WeakChangeListener this
        start local 1 // javafx.beans.value.ObservableValue observable
        start local 2 // java.lang.Object oldValue
        start local 3 // java.lang.Object newValue
         0: .line 84
            aload 0 /* this */
            getfield javafx.beans.value.WeakChangeListener.ref:Ljava/lang/ref/WeakReference;
            invokevirtual java.lang.ref.WeakReference.get:()Ljava/lang/Object;
            checkcast javafx.beans.value.ChangeListener
            astore 4 /* listener */
        start local 4 // javafx.beans.value.ChangeListener listener
         1: .line 85
            aload 4 /* listener */
            ifnull 4
         2: .line 86
            aload 4 /* listener */
            aload 1 /* observable */
            aload 2 /* oldValue */
            aload 3 /* newValue */
            invokeinterface javafx.beans.value.ChangeListener.changed:(Ljavafx/beans/value/ObservableValue;Ljava/lang/Object;Ljava/lang/Object;)V
         3: .line 87
            goto 5
         4: .line 91
      StackMap locals: javafx.beans.value.ChangeListener
      StackMap stack:
            aload 1 /* observable */
            aload 0 /* this */
            invokeinterface javafx.beans.value.ObservableValue.removeListener:(Ljavafx/beans/value/ChangeListener;)V
         5: .line 93
      StackMap locals:
      StackMap stack:
            return
        end local 4 // javafx.beans.value.ChangeListener listener
        end local 3 // java.lang.Object newValue
        end local 2 // java.lang.Object oldValue
        end local 1 // javafx.beans.value.ObservableValue observable
        end local 0 // javafx.beans.value.WeakChangeListener this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    6     0        this  Ljavafx/beans/value/WeakChangeListener<TT;>;
            0    6     1  observable  Ljavafx/beans/value/ObservableValue<+TT;>;
            0    6     2    oldValue  TT;
            0    6     3    newValue  TT;
            1    6     4    listener  Ljavafx/beans/value/ChangeListener<TT;>;
    Signature: (Ljavafx/beans/value/ObservableValue<+TT;>;TT;TT;)V
    MethodParameters:
            Name  Flags
      observable  
      oldValue    
      newValue    
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Ljavafx/beans/value/ChangeListener<TT;>;Ljavafx/beans/WeakListener;
SourceFile: "WeakChangeListener.java"