如何在循環中使用遞歸方法退出？

Question

這是我無法解決的問題。我有一個.xml文件，不是與父母和孩子，但與大孩子和多孫子。每個元素名稱都是唯一的，所以我需要一個方法來查找並返回可搜索元素。到目前爲止我的代碼：

public static Element findElement(Element current, String nameOfElement) { 
      Element searchedElement = null; // this element I want to return 
      List children = current.getChildren(); // current is a root element passed to method 
      Iterator iterator = children.iterator(); 
      //label: 
      while (iterator.hasNext()) { 
       Element child = (Element)iterator.next(); 
       if (child.getName().equals(nameOfElement)) { 
        searchedElement = child; // on some level it founds it 
        System.out.println("!!!"); // it's just a marker to see that action happens 
        //break label; 
        break; 
       } 
       findElement(child, nameOfElement); 
      } 
      return searchedElement;  
     } 

正常情況下，如果執行條件週期應根據打破阻止，但這種情況不會發生。另外我有一個關於添加標籤的想法。 （它在代碼中有註釋），但它也不起作用。遞歸啓動並清除變量搜索元素的值。 我找到了一個解決方案，但它看起來很醜，我不知道上面添加的代碼不起作用。我的解決方案是添加而不是遞歸調用findElement（child，nameOfElement）;此編號：

Element el = findElement(child, nameOfElement); 
      if (el != null && el.getName().toLowerCase().equals((nameOfElement).toLowerCase())) { 
       searchedElement = el; 
       return searchedElement; 
      } 

請幫忙找解！

Answer 1

嘗試的價值，

public static Element findElement(Element current, String nameOfElement) { 
     Element searchedElement = null; // this element I want to return 
     List children = current.getChildren(); // current is a root element passed to method 
     Iterator iterator = children.iterator(); 
     //label: 
     while (iterator.hasNext()) { 
      Element child = (Element)iterator.next(); 
      if (child.getName().equals(nameOfElement)) { 
       searchedElement = child; // on some level it founds it 
       System.out.println("!!!"); // it's just a marker to see that action happens 
       //break label; 
       break; 
      } 
      searchElement = findElement(child, nameOfElement); 
      if(searchElement != null) 
       return searchElement; 

     } 
     return searchedElement;  
    } 

Answer 2

你只需要返回遞歸調用

public static Element findElement(Element current, String nameOfElement) { 
     Element searchedElement = null; // this element I want to return 
     List children = current.getChildren(); // current is a root element passed to method 
     Iterator iterator = children.iterator(); 
     //label: 
     while (iterator.hasNext()) { 
      Element child = (Element)iterator.next(); 
      if (child.getName().equals(nameOfElement)) { 
       searchedElement = child; // on some level it founds it 
       System.out.println("!!!"); // it's just a marker to see that action happens 
       //break label; 
       break; 
      } 
      searchedElement = findElement(child, nameOfElement);//HERE !!! 
     } 
     return searchedElement;  
    }