java - 错误未报告异常 ClassNotFoundException;必须被捕获或宣布被扔出

Question

我正在使用雪球词干分析器，可以在此处找到 http://snowball.tartarus.org/

我正在使用这个论坛问题来为我自己的项目使用词干算法

Is there a java implementation of Porter2 stemmer

我使用给定的类并使用之前回答的帖子中给出的代码

Class stemClass = Class.forName("org.tartarus.snowball.ext." + lang + "Stemmer");
stemmer = (SnowballProgram) stemClass.newInstance();
stemmer.setCurrent("your_word");
stemmer.stem();
String your_stemmed_word = stemmer.getCurrent();  

但是当我使用 try catch 语句时，我收到此错误

assmt1/invert3.java:339: error: incompatible types: try-with-resources not applicable to variable type
      try(  Class stemClass = Class.forName("org.tartarus.snowball.ext." +"english"+ "Stemmer");
                  ^
(Class cannot be converted to AutoCloseable)
assmt1/invert3.java:340: error: incompatible types: try-with-resources not applicable to variable type
        SnowballStemmer stemmer = (SnowballStemmer) stemClass.newInstance())
                        ^
(SnowballStemmer cannot be converted to AutoCloseable)
2 errors

真的不知道如何解决这个问题

Answer 1

只有实现了AutoCloseable的类才能在 try-with-resources 中使用声明声明。

The try-with-resources statement is a try statement that declares one or more resources. A resource is an object that must be closed after the program is finished with it. The try-with-resources statement ensures that each resource is closed at the end of the statement. Any object that implements java.lang.AutoCloseable, which includes all objects which implement java.io.Closeable, can be used as a resource.

Class 和 SnowballStemmer 不是 AutoCloseable。将其放在 try block 内:

try {
    Class stemClass = Class.forName("org.tartarus.snowball.ext." +"english"+ "Stemmer");
    SnowballStemmer stemmer = (SnowballStemmer) stemClass.newInstance();
} catch(Exception e){
    //Do Something
} finally {
    //Do Something
}