List 集合指定值升序降序排列Comparator实现

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升序排序
升序排序通常是指从小到大的排序。对于数值类型来说，可以直接使用 compareTo 方法，而对于其他类型，可以根据实际需求实现比较逻辑。
示例代码

import java.util.Comparator;
import java.util.List;
import java.util.ArrayList;class Spgg2BO {private String spdm;private String ggdm;private String ggmc;private Integer ggwz;public Spgg2BO(String spdm, String ggdm, String ggmc, Integer ggwz) {this.spdm = spdm;this.ggdm = ggdm;this.ggmc = ggmc;this.ggwz = ggwz;}public Integer getGgwz() {return ggwz;}
}public class Main {public static void main(String[] args) {List<Spgg2BO> spgg2List = new ArrayList<>();// 添加一些示例数据spgg2List.add(new Spgg2BO("001", "01", "规格一", 10));spgg2List.add(new Spgg2BO("002", "02", "规格二", 5));spgg2List.add(new Spgg2BO("003", "03", "规格三", 20));// 使用Comparator.comparing按ggwz升序排序spgg2List.sort(Comparator.comparing(Spgg2BO::getGgwz));// 输出排序后的结果for (Spgg2BO item : spgg2List) {System.out.println(item.getGgwz());}}
}

降序排序
降序排序是指从大到小的排序。对于数值类型，可以通过反转比较结果来实现降序排序。

示例代码

import java.util.Comparator;
import java.util.List;
import java.util.ArrayList;class Spgg2BO {private String spdm;private String ggdm;private String ggmc;private Integer ggwz;public Spgg2BO(String spdm, String ggdm, String ggmc, Integer ggwz) {this.spdm = spdm;this.ggdm = ggdm;this.ggmc = ggmc;this.ggwz = ggwz;}public Integer getGgwz() {return ggwz;}
}public class Main {public static void main(String[] args) {List<Spgg2BO> spgg2List = new ArrayList<>();// 添加一些示例数据spgg2List.add(new Spgg2BO("001", "01", "规格一", 10));spgg2List.add(new Spgg2BO("002", "02", "规格二", 5));spgg2List.add(new Spgg2BO("003", "03", "规格三", 20));// 使用Comparator.comparing按ggwz降序排序spgg2List.sort(Comparator.comparing(Spgg2BO::getGgwz).reversed());// 输出排序后的结果for (Spgg2BO item : spgg2List) {System.out.println(item.getGgwz());}}
}