java application performance tuning interview questions

10 classic Java interview questions and classic java questions 1. How does Java's HashMap work? HashMap is a key value for the data structure. Each key has a corresponding value. The key is to identify such a value. Based on the hashing principle, HashMap stores and obtain

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

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 Environme

the CSS. CSS Standard: http://www.w3.org/TR/CSS21/provides a lot of CSS standards and usage guidelines, there are many classic examples. "JavaScript performance tuning for improved Web application Performance" (developerworks,2011 July): JavaScript is a sophisticated front-end development language that is widely u

Java exception architecture diagram and several interview questions, java architecture diagram questions 1. java exception Architecture The pink ones are checked exceptions, which must be captured by the try {} catch Block or dec

development, or at a milestone stage in software development.As a running platform for Java software, the parameters of the JVM will directly affect the performance of the Java program. For example, the JVM's heap size, garbage collection policy, and so on.For JVM-level tuning, developers need to be aware of how the J

original types, and to use the standard placeholders that are used in the JDK.7. Write a generic program to implement LRU caching?This is the equivalent of an exercise for people who like Java programming. To give you a hint, linkedhashmap can be used to implement a fixed-size LRU cache, which moves the oldest key-value pairs out of the cache when the LRU cache is full. Linkedhashmap provides a method called Removeeldestentry (), which is used by the

below: The total number of instances created on the left, the structure of the instance on the right, and the reference description below, which can be seen in the class Cyclicdependencies and referenced by HashMap.This can determine the location of the leak, and then according to the actual situation to analyze and solve. JVISUALVM remotely monitor Tomcat 1 and modify the remote Tomcat's catalina.sh profile, where it adds: java_opts="$JAVA

class is actually a data structure, we generally use the large O notation to choose the best implementation based on time, memory, and performance. The large o symbol provides a good indication of the performance of a large amount of data. 31How do I weigh the use of unordered arrays or ordered arrays? The greatest benefit of an ordered array is that the time complexity of the lookup is O (log n), and the

Title:java Program Performance Tuning notes (3)-tips to help improve performanceTags: tips to help improve performance grammar_cjkruby:true 1. Use exceptions with caution @Test public void Testinfortrycatch () {//performance difference long Starttime=system.currenttimemillis (); int a=0;

Java interview questions, java questions1/** 2 * write a function. It accepts an integer (assuming length) and returns an array. The length of the array is length, 3 * the content in the array is a random value ranging from 0 to (length-1) and cannot be repeated. 4*5 * If the length is 5, the array may be [, 4]. 6*7 *

Java interview questions, java questions 1. storage structures used by stacks and queues Chain storage and sequential Storage 2. understanding of time complexity and space complexityTime Complexity: Number of statement executions in an algorithm, which is T (n). When n ch

Java Multithreading and Concurrency basics interview questions and AnswersOriginal link: http://ifeve.com/java-multi-threading-concurrency-interview-questions-with-answers/Multithreading and concurrency issues are among the

Most developers believe that performance optimization is a more complex issue and requires a lot of experience and knowledge. Yes, it is not wrong. Admittedly, it's not easy to optimize your application for the best performance, but that doesn't mean you can't do anything without getting the experience and knowledge. Here are a few easy to follow suggestions and

), versioning (git or SVN), big Data (odd heat), artificial intelligence (tall), etc.Someone asked, why does the architect still write code? I think, need to write as always, but the goal is not the same, the theoretical level and practical ability need to improve at the same time. Depth, attention to design ideas and patterns, breadth, for the forefront of technology, to pursue and research, so as to the future technical framework selection to make a reasonable decision.Java from getting starte

Job-hopping is not frequent, but has participated in a lot of interviews (telephone interview, face to faces interview), large/small companies, Internet/traditional software company, batter (above his business, lack of actual combat experience, hang off), also face, fortunately not because of failure and discouraged, in the process of constantly check gaps, developed a practical, Trace, continuous improveme

. After creating an array or an object in the heap, you can also define a special variable in the stack that is equal to the first address of the array or object in the heap memory, and this variable in the stack becomes the reference variable of the array or object. The reference variable in the stack can then be used in the program to access an array or an object in the heap, which is equivalent to a name that is an array or an object.2 0. Can i cast int to a variable of type byte?What happens

wait ()?Engage in threading favorites.1,sleep () is a static method in Java.lang.Thread, and wait () is a method in Java.lang.Object;2,sleep () is used as the current thread to block itself, and resumes after the set time, and wait () is used for the current thread to determine other threads blocking, which is the performance of thread communication;3,sleep () does not release resources, wait () releases resources;4,sleep () must catch an exception,

assessment yourself. The performance improvements discussed here are for DayTrader applications only, and are specific to the workloads described here and the supported hardware and software stacks. The application performance improvements that you implement with the tuning changes described in this article are certa

Interview Questions for Java engineers [social recruitment], java engineers Http://blog.csdn.net/jackfrued/article/details/44921941 1. What are the features of object orientation?2. What are the differences between access modifiers public, private, and protected?3. Is String the most basic data type?4. Is float f = 3.4