Looking at some java example codes in the web I came across the following syntax:

public class WordCount {

 public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
    private final static IntWritable one = new IntWritable(1);
    private Text word = new Text();

    public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
        //...
    }
 }

 //...
}

Coming from C# background, where static classes cannot inherit from another class, I was a little confused about the extends keyword after the Map class. What does it mean to extend a static class, and what advantages does it provide?

java inheritance static
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