java programming interview questions and answers

Interview Questions (1 ):Connect n numbers to obtain the smallest or Largest Integer (Baidu exam) Description: There are n positive integers connected into a row to form a minimum integer.Program input: N countProgram output: Multi-digit join For example:When n = 2, the minimum integer connected by two integers 32,321 is: 32132,When N = 4, the minimum integer of the four integers, namely, 55, 31, 312, and

This is my. NET interview question and answer, I hope to be helpful to. NET job seekers, especially to fresh graduates. Use. NET to do b/s structure of the system, you are using several layers of structure to develop, the relationship between each layer and why this layering? From bottom to top: Data access layer, business logic layer (or become domain layer), presentation layerData Access layer: sometimes known as the persistence layer, its function

number of processor digits/2. For example, under a 32-bit processor, the maximum memory size that a single process can access is 232/2 = 2G. The maximum amount of memory that a single process can access is 1/2 of the maximum virtual memory, because half of the virtual memory is allocated to the operating system.4) What is a strong type and a weak type? Which one is better? Why?A strong type determines the type of data during compilation. The type cannot be changed during execution, but the weak

procedure or function using CLR reaches a certain threshold value, the system performance will decline exponentially! This is very dangerous! There may be no problem when using only a few items. If you use them on a large scale, it will cause serious system performance problems! In fact, we can make an analogy. Oracle and other database products have long supported Java programming and provided

How does hibernate work and why?Principle:1. Read and parse the configuration file2. Read and parse the ing information and create sessionfactory3. Open sesssion4. Create transaction Transation5. Persistent operations6. Submit the transaction7. Disable session8. Disable sesstionfactory Why:1. The code for JDBC database access is encapsulated, which greatly simplifies the tedious and repetitive code at the data access layer. 2. Hibernate is a mainstream persistence framework based on JDBC and an

number of processor digits/2. For example, under a 32-bit processor, the maximum memory size that a single process can access is 232/2 = 2G. The maximum amount of memory that a single process can access is 1/2 of the maximum virtual memory, because half of the virtual memory is allocated to the operating system.4) What is a strong type and a weak type? Which one is better? Why?A strong type determines the type of data during compilation. The type cannot be changed during execution, but the weak

operations on the memory? A: This question is difficult to answer. It is also a big question. However, you can answer questions in this way. C # can directly operate on the memory. Although pointers are rarely used, C # can use pointers. When using pointers, you must add unsafe at the front.. net uses the garbage collection mechanism (GC) function, which replaces programmers. However, the Finalize method cannot be directly used in C, instead, the fin

Describe the APK format.The APK file is compressed the androidmanifest. xml file, application code (. Dex files), resource files, and other files. A project is compiled into a single. APK file. What is an action?A description of something that an intent sender desires. What is activity?A single screen in an application, with supporting Java code. What is intent?A class (intent) describes what a caller desires to do. The caller sends this intent to And

"). Append ("World"). Append ("I love You"); This time S has more than one string to splice, it is supposed to be a number of objects generated, but the JVM will be an optimization, that is, only create an object, at this time it executes faster than the stringbuffer stitching. Look at this: String s2 = "Hello"; String s3 = "World"; String S4 = "I love You"; String S1 = s2 + s3 + S4; In this case, three more objects are created, resulting in a waste of memory space.

thread encounters IO blocking, I do not think there is a way to abort the thread. If the thread is blocking because of a call to wait, sleep, or join methods, you can break the threads and wake it up by throwing interruptedexception. I've written earlier how to deal with blocking methods in Java has a lot of information about handling thread blocking.13) What is the difference between Cyclibarriar and Countdownlatch in

consumers.This is similar to the question above, but it is a classic question, and sometimes the interview asks the following questions. There are, of course, a lot of solutions on how to solve Java producer consumer problems, and I've shared a way to block queues. Sometimes they even ask how to make a philosopher's meal.6)