java

how to load Tree inside JComboBox?

由 戏子无情 提交于 2021-02-19 05:21:07
问题 How can I show a tree inside a JComboBox popup? Here is example tree: Theoretical computer science Mathematical logic Automata theory Algorithms and data structures Analysis of algorithms Algorithms 回答1: There is no default way to put a tree in a combo box. There are a couple of options: If you can give allowing expansion of nodes, you can achieve a similar effect by adding space before some of the options in a standard JComobBox. Or even space and a dash in front of leaf options. If you need

How to specify the EJB bean name in the JNDI tree in JEE7

由 送分小仙女□ 提交于 2021-02-19 05:20:28
问题 I'm not sure if this is a generic JEE6 question or if it is a Wildfly 10/JBoss7 EAP implementation specific question. I'm trying to specify/override the default beanName used in my EJB JNDI mapping to something more meaningful to me. For example: LoginManagerBean: @Stateless public class LoginManagerBean extends BaseManagerBean implements LoginManager { .... } LoginManager: @Local public interface LoginManager{ .... } In this context, WF10 will automatically create a JNDI mapping for this EJB

How bad is declaring arrays inside a for loop in Java?

由 别来无恙 提交于 2021-02-19 05:20:04
问题 I come from a C background, so I admit that I'm still struggling with letting go of memory management when writing in Java. Here's one issue that's come up a few times that I would love to get some elaboration on. Here are two ways to write the same routine, the only difference being when double[] array is declared: Code Sample 1 : double[] array; for (int i=0; i<n; ++i) { array = calculateSomethingAndReturnAnArray(i); if (someFunctionOnArrays(array)) { // DO ONE THING } else { // DO SOME

How bad is declaring arrays inside a for loop in Java?

由 谁说胖子不能爱 提交于 2021-02-19 05:19:39
问题 I come from a C background, so I admit that I'm still struggling with letting go of memory management when writing in Java. Here's one issue that's come up a few times that I would love to get some elaboration on. Here are two ways to write the same routine, the only difference being when double[] array is declared: Code Sample 1 : double[] array; for (int i=0; i<n; ++i) { array = calculateSomethingAndReturnAnArray(i); if (someFunctionOnArrays(array)) { // DO ONE THING } else { // DO SOME

How to specify the EJB bean name in the JNDI tree in JEE7

由 社会主义新天地 提交于 2021-02-19 05:18:45
问题 I'm not sure if this is a generic JEE6 question or if it is a Wildfly 10/JBoss7 EAP implementation specific question. I'm trying to specify/override the default beanName used in my EJB JNDI mapping to something more meaningful to me. For example: LoginManagerBean: @Stateless public class LoginManagerBean extends BaseManagerBean implements LoginManager { .... } LoginManager: @Local public interface LoginManager{ .... } In this context, WF10 will automatically create a JNDI mapping for this EJB

Webservice returns java.lang.reflect.InvocationTargetException

由 给你一囗甜甜゛ 提交于 2021-02-19 05:16:27
问题 I am receiving the above message when making a request to a java webservice. We originally created a Java Console application and manually submitted an xml file. When running this as a Java Application the response is successfully created and displayed by using System.out.println. We are creating the web service by selecting the java file that contains the methods and choosing "create webservice" specifying the dynamic project that the webservice is to be created in and the methods to be

Webservice returns java.lang.reflect.InvocationTargetException

由 情到浓时终转凉″ 提交于 2021-02-19 05:13:52
问题 I am receiving the above message when making a request to a java webservice. We originally created a Java Console application and manually submitted an xml file. When running this as a Java Application the response is successfully created and displayed by using System.out.println. We are creating the web service by selecting the java file that contains the methods and choosing "create webservice" specifying the dynamic project that the webservice is to be created in and the methods to be

Java mail TLS authentcation

由 匆匆过客 提交于 2021-02-19 05:08:50
问题 I am trying to get a grasp on the fundamentals of Java Mail API and TLS. I have the following scenario: There is an STMP server that uses TLS & SSL. If I log on to this server with some client, I can send authenticated &verified e-mails without any problems. Then I try to run a web server on a different machine, that sends mail using the previously mentioned SMTP server. I still want to send TLS & SSL emails, however no matter how I configure the startup properties I get the following well

java8-parallelstream

由 偶尔善良 提交于 2021-02-19 05:02:32
Parallel stream Fork and join Pseudocode If(task is small enough or no longer divisible){ Compute task sequentially }else{ split task in two subtasks call this method recursively possibly further splitting each subtask wait for the completion of all subtasks combine the results of each subtask} public class ForkJoinSumCalculator extends RecursiveTask<Long> { private final long [] numbers ; private final int start ; private final int end ; public static final long THRESHOLD = 10_1000 ; public ForkJoinSumCalculator( long [] numbers) { this (numbers, 0 , numbers. length ); } public

四十二,Java 网络编程浅析

由 时光怂恿深爱的人放手 提交于 2021-02-19 04:59:12
1. 网络编程的基本概念 网络编程使物理上不在一起的主机进行互联 , 网络连接过程需要使用网络协议 , 常见的通信协议是 TCP,UDP 协议 . TCP: 属于可靠的连接 , 使用三方握手的方式完成连接的确认 . UDP: 属于不可靠的连接 . 对于网络的开发有两种架构 :C/S 和 B/S. 2. 简单 TCP 程序实现 网络开发包所在的类都在 java.net 开发包中 . 此包中可以使用 ServerSocket,Socket 类完成服务器和客户端的开发 . 开发 TCP 程序 , 首先开发服务器端 , 使用 ServerSocket 进行客户端的连接接收 , 每个客户端在程序上都使用 Socket 对象表示 . Server 代码 : package com.ares.demo.helloserver; import java.io.OutputStream; import java.io.PrintStream; import java.net.ServerSocket; import java.net.Socket; public class HelloServer { public static void main(String[] args) throws Exception { ServerSocket server = new ServerSocket
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