hadoop在eclipse当中如何添加源码？

[学习笔记]

/*org.apache.hadoop.mapreduce.mapper.context,java.lang.interruptedexception,想看map的源代码，按control，点击，出现attach source code,点击external location/external file,找到源代码，就在source目录下，,d:\hadoop-2.7.4\src
 其中key为此行的开头相对于文件的起始位置，value就是此行的字符文本
  */  public void map(object key, text value, context context) throws ioexception, interruptedexception {
            system.out.println("key is 马克-to-win @ 马克java社区 "+key.tostring()+" value is "+value.tostring());
            stringtokenizer itr = new stringtokenizer(value.tostring());
            while (itr.hasmoretokens()) {
                word.set(itr.nexttoken());
                context.write(word, one);
            }
        }
    }

    public static class intsumreducer extends reducer<text, intwritable, text, intwritable> {
        private intwritable result = new intwritable();
        public void reduce(text key, iterable<intwritable> values, context context)
                throws ioexception, interruptedexception {
            system.out.println("reduce key is 马克-to-win @ 马克java社区 "+key.tostring());
            int sum = 0;
            for (intwritable val : values) {
                int valvalue=val.get();
                system.out.println("valvalue is"+valvalue);
                sum += valvalue ;
            }
            result.set(sum);
            context.write(key, result);
        }
    }


    public static void main(string[] args) throws exception {
        configuration conf = new configuration();
        string[] otherargs = new genericoptionsparser(conf, args).getremainingargs();
        if (otherargs.length != 2) {
            system.err.println("usage: wordcount <in> <out>");
            system.exit(2);
        }
        job job = new job(conf, "word count");
        job.setjarbyclass(wordcount.class);
        job.setmapperclass(tokenizermapper.class);

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