Collections.sort升序和降序笔记

Collections.sort(positionArray, new Comparator<Integer>() {

@Override
public int compare(Integer lhs, Integer rhs) {

//降序
if(lhs > rhs){

return -1;
}else if(lhs < rhs){

return 1;
}else{

return 0;
}
}

});

Collections.sort(positionArray, new Comparator<Integer>() {

@Override
public int compare(Integer lhs, Integer rhs) {

//升序
if(lhs > rhs){

return 1;
}else if(lhs < rhs){

return -1;
}else{

return 0;
}
}
});