相关疑难解决方法(0)

我可以很好地比较字符串,但想知道如何对浮点数进行排名？

getChange()返回一个String.我希望能够降序排序.我怎样才能做到这一点？

更新:

package org.stocktwits.helper;

import java.util.Comparator;

import org.stocktwits.model.Quote;

public class ChangeComparator implements Comparator<Quote>
{
    public int compare(Quote o1, Quote o2) {
        float change1 = Float.valueOf(o1.getChange());
        float change2 = Float.valueOf(o2.getChange());

        if (change1 < change2) return -1;
        if (change1 == change2) return 0; // Fails on NaN however, not sure what you want
        if (change2 > change2) return 1;
    }
}

我收到编译时错误:

This method must return a result of type int    ChangeComparator.java