1 public void setValueReference(ValueReference<K, V> valueReference) {
2   ValueReference<K, V> previous = this.valueReference;
3   this.valueReference = valueReference;
4   if (previous != null) {
5     previous.clear();
6   }
7 }
8 

1 public void setValueReference(ValueReference<K, V> valueReference) {
2   ValueReference<K, V> previous = this.valueReference;
3   this.valueReference = valueReference;
  
4   previous.clear();
  
5 }
6