java certification questions

Most commercial Web sites provide site authentication to protect certain limited resources, HTTP protocol and Java EE specification of the WEB site certification process has been detailed definition, common browsers can provide the corresponding interface form to help users complete the site certification process. However, in some cases, we need to write programs

Certification is the process of trying to prove who a user is. For authentication, a user needs to provide some form of identification that the system can understand and trust. The technical terms that we need to understand in this process include:subject--refers to the current operator, which can be a person (user), a third-party program, and any other person or thing that interacts with our application.principals--is a subject attribute, such as use

Implementation method: Import java.util.Hashtable; Import Javax.naming.Context; Import javax.naming.NamingEnumeration; Import Javax.naming.ldap.InitialLdapContext; Import Javax.naming.ldap.LdapContext; public class Ldapauth { private String domain; Private String Ldaphost; Private String searchbase; Public Ldapauth () { This.domain = "{domain}"; This.ldaphost = "ldap://{ip}:{port}"; This.searchbase = "DC={DC},DC={DC}"; } Public Ldapauth (String domain,string host,string dn) { This.domain = d

Random There are many ways to generate random numbers using the Java 2 SDK base Class library. But if you can't keep up with the updates to these libraries, you might be using an inefficient random-number generation mechanism, and worse: You might not get random numbers that are evenly distributed. This article will show you a more reliable method of random number generation, while comparing it with other methods. Since the JDK initial release, we can

Java --- Java interview questions (1), java --- java interview questions 1. What is a Java Virtual Machine? Why is Java called a pl

Summary of Java back-end development interview questions of major companies, and java back-end interview questions ThreadLocal (thread variable copy) Synchronized implements Memory sharing. ThreadLocal maintains a local variable for each thread. It uses space for time, which is used for data isolation between threads

Java learning path-simple basic interview questions, java path-Questions 1. What are the features of object orientation? A: The object-oriented features mainly include the following: 1) Abstraction: Abstraction refers to the process of summarizing the common features of a class of objects to construct classes, includin

Java interview questions, java questions1. simple principles and applications of the Exception Handling Mechanism in C ++ or Java.When a JAVA program violates the JAVA Semantic Rules, the JAVA Virtual Machine will indicate an erro

Java basic questions (JVM), java basic questions jvm 1. What is a Java Virtual Machine? Why is Java called a platform-independent programming language "? A Java virtual machine is a vir

Java interview questions, java questionsCommon Java interview questions: What if the main method is declared as private? Answer: It can be compiled normally, but the system prompts "the main method is not public" during running ".Q: What is the difference between passing ref

Java Exception Handling interview questions, java exception handling questions 1. What are the differences between error and exception? An error indicates a system-level error. It is an internal error in the java Runtime Environment or a hardware problem. You cannot expect a

Summarize the Java Background Development interview questions and the java Background interview questions. Jing er has been summing up some interview questions recently, because he must take everything seriously. The same is true for the interview. As the interviewer of The