util/compare/ConversionNum.java

package com.zkh360.api.brand.util;

import com.zkh360.api.brand.dto.BrandInfoResult;
import org.apache.commons.lang.StringUtils;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class ConversionNum {

    public static List<BrandInfoResult> getCollectionsResult(List<BrandInfoResult> brands){

        Comparator<BrandInfoResult> brandComparator = new Comparator<BrandInfoResult>() {
            @Override
            public int compare(BrandInfoResult o1, BrandInfoResult o2) {
                if (o1 == o2) {
                    return 0;
                }
                String firstWord1 = o1.getFirstWord();
                String firstWord2 = o2.getFirstWord();

                String brandName1 = o1.getBrandName();
                String brandName2 = o2.getBrandName();

                int result = stringCompare(firstWord1, firstWord2);

                if (result == 0) {
                    return stringCompare(brandName1, brandName2);
                } else {
                    return result;
                }
            }
        };
        Collections.sort(brands, brandComparator);
        return brands;
    }

    public static int stringCompare(String str1, String str2) {
        if (str1 == str2) {
            return 0;
        }

        if (str1 == null && str2 != null) {
            return -1;
        }

        if (str1 != null && str2 == null) {
            return 1;
        }

        return str1.compareTo(str2);
    }

}