Collections.sort(List<T> list, Comparator<? super T> c) 应用

1.// 排序  先新增一个Comparator
Comparator<DmoProcedureVO> comparator = new Comparator<DmoProcedureVO>() {
@Override
public int compare(DmoProcedureVO first, DmoProcedureVO second) {
UFDouble num1 = new UFDouble(first.getVprocedureno());
UFDouble num2 = new UFDouble(second.getVprocedureno());
return num1.compareTo(num2);
}
};

// 应用 Collections.sort 默认按照升序排序
for (Map.Entry<String, List<DmoProcedureVO>> entry : res.entrySet()) {
Collections.sort(entry.getValue(), comparator);
}

2.

Integer m ;

Integer n ;

m.compareTo(n) ;

返回结果等于0 ，m等于n ，当前值=参数; 

返回结果大于0 ，m大于n，当前值>参数;

返回结果小于0，m小于n,当前值<参数.