此关键字的机器人机器人、关键字

2023-09-07 11:33:20 作者:銩るdè心喓怎庅収佪

为什么我们使用随着Android的方法名称关键字同一类中调用从另一个方法的方法。在Java或C#中,我们可以调用其他方法的情况下直接在关键字,如下面的code。

 公共最后弦乐getElementValue(节点ELEM)
 {
     子节点;
     如果(ELEM!= NULL)
     {
         如果(elem.hasChildNodes())
         {
             对于(子= elem.getFirstChild();!孩子= NULL;孩子= child.getNextSibling())
             {
                 如果(child.getNodeType()== Node.TEXT_NODE)
                 {
                     返回child.getNodeValue();
                 }
             }
         }
     }
     返回 ;
 }

 / **
  *获取节点值
  * @参数元素节点
  * @参数密钥字符串
  * * /
 公共字符串的getValue(元素项,字符串str)
 {
     节点列表N = item.getElementsByTagName(STR);
     返回this.getElementValue(n.item(0));
 }
 

解决方案

在关于本规定问题的假设是不正确。 这是一样的java的 - 你不必添加this关键字

但建议使用它时,你必须具有相同名称的多个功能,但其范围是不同的(例如静态与正常功能)。

另外,建议如果字段没有一个preFIX(如M或_),你应该使用本。您还可以设置Eclipse来自动添加这个关键字这样的情况。

2018机器人领域发展关键词大盘点

Why do we use the this keyword along with the method name in Android to call a method from another method within the same class. In Java or C# we can call other method directly without the this keyword, as in the code below.

public final String getElementValue( Node elem )
 {
     Node child;
     if( elem != null)
     {
         if (elem.hasChildNodes())
         {
             for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() )
             {
                 if( child.getNodeType() == Node.TEXT_NODE  )
                 {
                     return child.getNodeValue();
                 }
             }
         }
     }
     return "";
 }

 /**
  * Getting node value
  * @param Element node
  * @param key string
  * */
 public String getValue(Element item, String str)
 {      
     NodeList n = item.getElementsByTagName(str);       
     return this.getElementValue(n.item(0));
 }

解决方案

the assumption in the question about the "this" requirement is incorrect . it's the same as on java - you don't have to add the "this" keyword .

however , it is recommended to use it when you have multiple functions that have the same name , yet their scope is different (for example static vs normal functions) .

also , it is recommended that if the fields don't have a prefix (such as "m" or "_" ) , you should use "this" . you can also set eclipse to automatically add the "this" keyword for such cases .