importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStreamReader;importjava.io.PrintWriter;importjava.net.ServerSocket;importjava.net.Socket;publicclassEchoServerExample{publicstaticvoidmain(String[]args){try{ServerSocketserverSocket=newServerSocket(8080);System.out.println("服务器启动...
file=<file>dump heap to<file>Example:jmap-dump:live,format=b,file=heap.bin<pid>-Fforce.Usewith-dump:<dump-options><pid>or-histo to force a heap dump or histogram when<pid>does not respond.The"live"suboption is not supportedinthismode.-h|-help to printthishelp message-J<flag>to pass...
By default, the number of threads is set to 2 for the server JVM, to 1 for the client JVM, and it scales to the number of cores if tiered compilation is used. The following example shows how to set the number of threads to 2: -XX:CICompilerCount=2 -XX:CodeCacheMinimumFreeSpace=...
<beanid="userService"class="com.example.UserService"scope="singleton"/> 在上面的示例中,定义了一个ID为userService,类型为com.example.UserService,作用域为singleton的Bean。 2)Bean的依赖 在Bean的依赖中,主要包括Bean之间的依赖关系和依赖注入方式等方面。 下面是一个简单的Bean依赖示例: <beanid="userServ...
println("Echo: " + message); } } catch (IOException e) { e.printStackTrace(); } } } // 客户端 import java.io.*; import java.net.*; public class ClientExample { public static void main(String[] args) { try (Socket socket = new Socket("localhost", 12345)) { PrintWriter out =...
类ExampleA继承Exception,类ExampleB继承ExampleA。 List、Set、Map是否继承自Collection接口? 阐述ArrayList、Vector、LinkedList的存储性能和特性。 Collection和Collections的区别? List、Map、Set三个接口存取元素时,各有什么特点? TreeMap 和 TreeSet 在排序时如何比较元素?Collections 工具类中的 sort()方法如何比较元...
echo " e.g: sh $0 1234" echo "" exit 1 fi top -H -p "$pid"|head -20 echo "" top_thread_id=`top -H -p $pid|head -8|awk '/java/{print $2}'`#echo"top cpu thread:$top_thread_id"thread_id_hex=`printf "%x" "$top_thread_id"`#echo"$thread_id_hex"jstack "$pid"|...
io.*; @SpringBootApplication @RestController public class SerializeDemo { public static void main(String[] args) { String file_name="D:\\Code\\java\\h0cksr_springboot_02\\src\\main\\java\\com\\example\\h0cksr_springboot_02\\employee.db"; Boolean end = serialize_employee(file_name);...
1. 查看网站URL结尾:一般来说,使用PHP开发的网站的URL结尾会是.php,而使用Java开发的网站的URL结尾会是.java。例如,如果一个网站的URL是www.example.com/index.php,那么可以确定该网站的后端是PHP。 2. 查看网站源代码:通过查看网站的源代码,你可以找到一些使用了特定的语言特性或框架的线索,从而判断后端是使用Ja...
ExampleGet your own Java Server public class Main { public static void main(String[] args) { System.out.println("Hello World"); } } Try it Yourself » Click on the "Run example" button to see how it works.We recommend reading this tutorial, in the sequence listed in the left ...