我有3.java文件

1) Mapper.java
2) Reducer.java
3) Driver.java

我试图在命令行使用驱动程序类编译hadoopmapreduce程序，但它显示了以下错误

Driver.java:39: error: cannot find symbol
        job.setMapperClass(Mapper.class);
                           ^
  symbol:   class Mapper
  location: class Driver
Driver.java:40: error: cannot find symbol
        job.setReducerClass(Reducer.class);

如何解决上述错误。下面是驱动程序类中的run方法

public boolean runnerParsing(String inputPath, String outputPath) throws IOException, ClassNotFoundException, InterruptedException {
         Configuration conf = new Configuration();

        Job job = new Job(conf, "Parsing");
        job.setJarByClass(Driver.class);

        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);

        job.setMapperClass(Mapper.class);
        job.setReducerClass(Reducer.class);
        //job.setNumReduceTasks(0);

        job.setInputFormatClass(TextInputFormat.class);
        job.setOutputFormatClass(TextOutputFormat.class);

        FileInputFormat.addInputPath(job, new Path(inputPath));
        FileOutputFormat.setOutputPath(job, new Path(outputPath));

        return job.waitForCompletion(true);

     }