java interview questions for testers

Before I resigned, I gave my company a set of interview questions. What do you think is difficult ?? Oracle Database assessment: 1. Write a jdbc connection to the database and add, delete, modify, and query data code (simply write it ). Answer: PublicstaticvoidMain (String [] args ){ //TODOAuto-generated method stub Connection cn =Null; CallableStatement cstmt =Null; Try{ // Do not do this here, because th

10 seconds, Server 20 seconds16. What design patterns do you use in your usual development, and can you talk about the usage scenarios of these design patterns? In peacetime, there are more singleton patterns (used when only one object is instantiated in memory), adapter mode (typically the adapter of the ListView and GridView), builder mode (ALERTDIALOG.BUILDER), the observer pattern may be more subtle, In the Android source code baseadapater the implementation of the notifydatasetchanged (? ）

This section also contains data structures, algorithms, and an array of interview questionsThe difference between List, Set, Map, and Queue (answer)List is an ordered set that allows elements to be duplicated. Some of its implementations can provide constant access time based on subscript values, but this is not guaranteed by the List interface. Set is an unordered collection.The poll () method and the Remove () method differ?Both poll () and remove (

JSP enterprise interview questions (4)5-1. Briefly describe the relationship between Servlet and JSP. JSP is implemented in another way. servlet is an earlier version of JSP. In JSP, it focuses more on the page performance, while in servlet, it focuses more on the implementation of business logic. Therefore, JSP is preferred when the page display effect is complex. Or htmlCodeJSP can be selected when

What is the hidden content of this post after a PHP programmer's classic interview and a written examination question? 201712195421.rar (41.35KB, download times: 1) 2010-10-1322: 37 Upload download times: 1 Original Post address: phpjava.orgthread-25-1-1.html this article from: PJDN -- php amp; java Forum | analysis of classic interview and written examination

discard other tasks after the D.looper, each Looper create a message queue and thread object, not a resource pool; so the answer is AC9. The following understanding of the Android Ndk is correct ( ABCD )A, the NDK is a collection of a series of toolsB, NDK provides a stable, limited functionality of the API header file declarationC, so that "java+c" the development of the way finally become a positive, officially supported the development of the wayD

maintainability and non-repetition of wheel-making. For example, all spring templates (JDBC,REST,JPA, and so on) have the following advantages: they are built in a consistent way, so you can skip these general steps to focus on more important business logic. Spring MVC is not necessarily the best web framework. There are other, for example, Struts 2,wicket and JSF. That said, spring can also be well integrated with these frameworks (STRUTS,JSF, etc.). XML files are too bloated, and this

Android interview questions 1.Which of the following statements about memory reclaim are correct? (B) A,ProgramThe worker must create a thread to release the memory. B,The memory reclaim program is responsible for releasing useless memory. C,The memory reclaim program allows programmers to directly release the memory. D,The memory reclaim program can release memory objects at a specified time. 2

briefly summarize below: TCP multiplexing: TCP connection multiplexing is the reuse of HTTP requests from multiple clients to a single server-side TCP connection, while HTTP multiplexing is the processing of multiple HTTP requests by one client over a TCP connection. The former is a unique feature of the load balancer device, which is a new feature supported by the HTTP 1.1 protocol and is currently supported by most browsers. Content caching: Caches the content that is often used,

Q A location: http://space.cnblogs.com/q/20546/q A: I have asked more questions about the relationship: 5 [resolved issues] Browse: 52 times 00 Student table T1 Stu_id Stu_name 1 Zhang San 2 Li Si 3 Wang Wu Course list T2 Co_id Co_name 1 Java 2 C # 3 C 4 C ++ 5 Javascript Lin

Summary of String-related Interview Questions 1. First, let's look at the oldest. Is String a basic data type? A: No. Basic data types include byte, char, short, int, long, float, double, and boolean. These eight types are built-in types in Java, also called native types, string is not. It is a class. 2. String s1 = "abc"; String s2 = "abc"; System. out. println