Question

如何记录此方法？返回值取决于if语句的结果。我是否必须写下两种可能的回报以及它应该是什么样的？

/**
 * [...]
 *
 * @throws java.io.IOException 
 * @return aktivesKonto The Konto we looked for.
 * @return null If there wasn't an aktivesKonto
 */
public Konto getKonto(String kontonummer) throws java.io.IOException {

    if(...){
        System.out.println(...);

        return null;
    }
    else{

        return aktivesKonto;
    }
}

谢谢。

Answer 1

参见http://www.oracle.com/technetwork/articles/java/index-137868.html

的示例

/**
 * Returns an Image object that can then be painted on the screen. 
 * The url argument must specify an absolute {@link URL}. The name
 * argument is a specifier that is relative to the url argument. 
 * <p>
 * This method always returns immediately, whether or not the 
 * image exists. When this applet attempts to draw the image on
 * the screen, the data will be loaded. The graphics primitives 
 * that draw the image will incrementally paint on the screen. 
 *
 * @param  url  an absolute URL giving the base location of the image
 * @param  name the location of the image, relative to the url argument
 * @return      the image at the specified URL
 * @see         Image
 */
 public Image getImage(URL url, String name) {
        try {
            return getImage(new URL(url, name));
        } catch (MalformedURLException e) {
            return null;
        }
 }

Answer 2

读者将阅读文档，如，如果您撰写return null，则不会返回null，但您将返回值为object Konto的{{1}}。

并参考编码标准如果可能，只保留一个null语句，如下所示，建议使用。

return

所以在if语句中，如果你指定一些public Konto getKonto(String kontonummer) throws java.io.IOException { Konto aktivesKonto=null; if(...){ System.out.println(...); } return aktivesKonto; }的值，它将返回相同的Konto

如果有多个可能的return语句，如何记录@return？

2 个答案: