Guava_常用

public interface LineProcessor<T> {
  /**
   * This method will be called once for each line.
   * @param line the line read from the input, without delimiter
   * **@return true to continue processing, false to stop**
   * 
   */
  boolean processLine(String line) throws IOException;
  T getResult();
}

例如：可以通过Files和ＬineProcessor组合来按行读取文件并处理。

private static Map<String, Integer> analyzeJavaFile(File codeFile) throws IOException {
        return Files.readLines(codeFile, Charsets.UTF_8, new LineProcessor<Map<String, Integer>>() {
            private Map<String, Integer> countMap = Maps.newHashMap();
            @Override
            public boolean processLine(String line) throws IOException {
                //代码逻辑
                return true;
                //返回false则说明读取文件结束。
            }

            @Override
            public Map<String, Integer> getResult() {
                return this.countMap;
            }
        });
    }