lovely_J的博客

import java.io.File; import java.io.IOException; public class TestFile { public void createFile(String path){ File file=new File(path); if(!file.exists()){//判断文件是否存在

实验：import java.util.HashMap; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.Map;public class TestLinkedHashMap { public static void main(String args[]) { System.

打印时间Java版 @WebServlet(name = "Servlet" , urlPatterns = "/01demo") public class Demo01 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws Se