java - 在Java中实现按属性排序然后购买属性然后购买属性

Question

给定以下类(class):

class Boo {
    private final String propertyX;
    private final Double propertyY;
    private final Integer propertyZ;
}

如何构建一个 Comparator当Collection.sort(...)时，这将导致该类的实例按propertyX排序，然后按propertyY排序，然后按propertyZ排序。被调用 Collection<Boo> .

是Comparator该怎么走？

Answer 1

你确实按照你的建议去做。

Comparator<Boo> booCmp = new Comparator<Boo>() {
    @Override
    public int compare(Boo o1, Boo o2) {
        int cmp = o1.propertyX.compareTo(o2.propertyX);
        if (cmp == 0)
            cmp = o1.propertyY.compareTo(o2.propertyY);
        if (cmp == 0)
            cmp = o1.propertyZ.compareTo(o2.propertyZ);
        return cmp;
    }
};