Case2#MapClass

 public static class Map extends Mapper<LongWritable,Text,Text,IntWritable>  /* Mapper Input Key - LongWritable , Input Value - Text, Output Key - Text , Output Value - Integer */
	{
	  private Text survived = new Text(); /* Output Key */
	  public void mapclassgender(LongWritable key,Text value, Context context) throws IOException,InterruptedException
	  {
		String line = value.toString(); /* Converting entire row into String */
        String columns[]=line.split(","); /* Splitting into columns */
		String class_gender;
        if(columns.length > 6) /* If Length of the list is greater than 6 */
		{
         if(columns[1]=="0") /* If Person Survived */
		 {
            class_gender = columns[4]+" "+columns[2]   /* Composite Key with Gender and class */
			survived.set(class_gender)
         }
		}
        content.write(survived,1);
	  }		
		
    }