小灬罗的博客

CloseableHttpClient closeableHttpClient = HttpClients.createDefault(); HttpGet httpGet=new HttpGet(url); try { CloseableHttpResponse response = closeableHttpClient.execute(httpGet); String r...

List<Student> list=new ArrayList<Student>(); list.add(new Student("xx", 12,"男")); list.add(new Student("qq", 18,"男")); list.add(new Student("aa", 20,"女"))

List<Student> list=new ArrayList<Student>(); list.add(new Student("xx", 12,"男")); list.add(new Student("qq", 18,"男")); list.add(new Student("aa", 20,&quot

枚举（enum），是指一个经过排序的、被打包成一个单一实体的项列表。一个枚举的实例可以使用枚举项列表中任意单一项的值。枚举在各个语言当中都有着广泛的应用，通常用来表示诸如颜色、方式、类别、状态等等数目有限、形式离散、表达又极为明确的量。Java从JDK5开始，引入了对枚举的支持。 public class TestEnum {public static void main(String[]...

import com.alibaba.fastjson.JSONObject;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import javax...