MapReduce中自定义比较

package tq;


import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableComparator;

public class MySortComparator extends WritableComparator{

//	public MySortComparator() {
//		super(TQ.class,true);
//		
//	}
	
	@Override
	public int compare(WritableComparable a,WritableComparable b) {
		TQ t1= (TQ)a ;
		TQ t2 = (TQ)b;
		int c1 = Integer.compare(t1.getYear(), t2.getYear());
		if(c1 == 0) {
			int c2 = Integer.compare(t1.getMonth(), t2.getMonth());
			if(c2 == 0) {
				return -Integer.compare(t1.getWd(), t2.getWd());
			}
			return c2;
		}
		return c1;		
	}
}