//main中Collections.sort(totalList,new MyComparator());
class MyComparator implements Comparator<MerAndMon> {
@Override
public int compare(MerAndMon m1, MerAndMon m2) {
if(m1.getMerId().compareTo(m2.getMerId()) == 1){
return 1 ;
}else if(m1.getMerId().compareTo(m2.getMerId()) == -1){
return -1 ;
}else{
return 0 ;
}
}
}