java coding test for interview

Recently consider the issue of change work, so cast resume interview, interview 5 companies senior Java engineer, there are 4 gave me an offer, think of summing up the interview experience, convenient recently are looking for opportunities for youfirst, no pen questionDo not know whether or not the position is not met,

Java interview questions (answer)First, let's talk about the differences between final, finally, and finalize.Final? Modifier (keyword) If a class is declared as final, it means that it cannot generate a new subclass and cannot be inherited as a parent class. Therefore, a class cannot be declared both abstract and final. Declare variables or methods as final to ensure that they are not changed during use. V

[TOC] Java Programmer successful interview cheats tags (space-delimited): Java Fourth to write the core algorithmThe difference between comparable and comparator interfaces Test: @Test public void Sortints () { final int[] numbers = { -3, -5, 1, 7, 4,-2};

, when he asked me that HTTP, I only said 404 status code, but he was called out by the boss, and then the other came back to say the company to have experience, and then mean to hang up ...Well, if he is judging by my answer, then I will not say anything, the service ... I just wanted to say how you came up with this judgment, but I didn't ask about my project experience.But I do not want to go to this company, forget, is also their own Java Foundati

Java interview questions: Implementation of stacks and queues During the interview, stacks and queues are often checked in pairs. This article includes the following stack and queue test content: 1) stack Creation 2) create a queue 3) Two stacks implement one queue 4) two queues implement one stack 5) design the stack

during the compilation period until it reaches the runtime) Because the list Reflection mechanism, through the check during the compilation period cheated us. In addition, we can pass the compiler check through reflection. Implementation Code Package COM. jue. test; import Java. lang. reflect. invocationtargetexception; import Java. lang. refle

First, let's talk about the differences between final, finally, and finalize. Second, can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )? Third, the difference between static nested class and inner class is that the more you say, the better (the more general the interview questions are ). Fourth, the difference between and. Fifth, the difference between hashmap

threads are not able to modify objects in the collection that is being traversed by iterator. At the same time, iterator allows the caller to delete elements from the underlying collection, which is not possible for enumeration.What is the difference between 17.HashSet and TreeSet?HashSet is implemented by a hash table, so its elements are unordered. The time complexity of the add (), remove (), contains () method is O (1).On the other hand, TreeSet is implemented by a tree-shaped structure in

configuration file on the matter, back to use, said there was no time to see the specific implementation, anyway, you are not very old, Work time is not long, I this inner tangle Ah, last night made up a night, did not sleep well, always afraid to be asked. The results of today's interview, just ask me the Java Foundation, but also let me give him what to paint. Here's the start: One, string a= "123"; stir

Collector deletes an object. 13. Can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )? An anonymous internal class is an internal class without a name. It cannot be extends (inherited) other classes, but an internal class can be used as an interface and implemented by another internal class. 14. The difference between static nested class and inner class is that the more you say, the better (the more general

Basic java exception knowledge and some interview questions Java is an object-oriented design language, so exceptions are encapsulated into classes in java, and we only need to know how to handle exceptions, Exception Overview Exception: An exception occurs when the Java pro

the wrapper class provided by Java for Int. the default value for int is 0, and the default value of integer is null, that is, the integer can distinguish between unassigned and a value of 0, and int cannot express an unassigned condition , for example, to express the difference between not taking a test and a test score of 0, You can only use integer. In JSP de

operations when the exception is handled. If an exception is thrown, the matching catch clause executes, and the control enters the finally block, if any.The Finalize method name. Java technology allows the use of the Finalize () method to do the necessary cleanup before the garbage collector clears objects from memory. This method is called by the garbage collector to this object when it determines that the object is not referenced. It is defined in

Recently, the developer headlines shared a "Xiaomi Java second Round", a lot of Java programmers expressed great interest.I will share with you the second round of Millet Java (Huawei Java Engineer Written test paper can see the end of the article):0, talk about the understa

Framework BasicsReflection: Reflection is a kind of dynamic correlation mechanism of Java development. Because the Java language itself is not a dynamic language, if we want to get the dynamic effect of the program, we introduce the concept of reflection mechanism.How do you express reflection?What can I do with reflection?PS: An interview question: What are the

In the Java interview, I always like a few questions about the String object, such: 1. String s = new String ("abc"); several String objects are created. 2. String s1 = "abc ";String s2 = "";String s3 = s2 + "bc ";String s4 = "a" + "bc ";String s5 = s3.intern ();If s1 = s3 is true or false, s1 = s4 is false or true. What about s1 = s5? I have encountered a lot of such questions. Today I would like to make a

use annotations to configure beans in spring? What are the relevant annotations?153. What are the types of transaction management supported by spring? Which method do you use in your project?154. How do I configure Spring's IOC container in a Web project?155. How do I configure Spring MVC in a Web project?156. How does Spring MVC work?157. How do I configure the data source in the spring IOC container?158. How do I configure the configuration transaction enhancements?159. Why do you choose to u

questions. If any interview asks this question, I suggest you stay away from the company. 14th, does the array have the length () method? Does string have the length () method? The array does not have the length () method. It has the Length attribute.String has the length () method. 15th, the difference between overload and override. Can the overloaded method change the type of the returned value? 　Overriding and overloading are different manifestati

encountered a face test, but also with automatic packing and unpacking a bit of a relationship Public class Test03 { publicstaticvoid main (string[] args) { = F2 = 100, F3 = F4 =. = = F2) ; = = f4);} }The first thing to note is that F1, F2, F3, and F4 Four variables are all integer object references, so the following = = Operation compares values instead of references. What is the nature of boxing? when we assign an int v

the classmate who learns the operating system must already be familiar with it. Java provides a number of ways to support blocking, let's analyze each of them.Method descriptionSleep () sleep () allows you to specify a period of time in milliseconds as a parameter, which causes the thread to enter a blocking state for a specified amount of time, does not get CPU time, the specified time is over, and the thread re-enters the executable state. Typicall