Dmitry Roo

var result  =  component.getChildComponents().stream()
                    .sorted(Comparator.comparingInt(TextComponent::getCountChildElements))
                    .collect(Collectors.toList());
component.getChildComponents().clear();
component.getChildComponents().addAll(result);

public void setChildComponents(List<TextComponent> childComponents) {
       this.childComponents = childComponents;
    }

class A {
 private String xPath;
...
 public String getXPath() {
  return this.xPath;
 }
}

class B { 
  private A a;
...
  void someVoid() { 
...
  String xPath = a.getXPath();
...
 }
}