java top interview questions

I. Application of the factory model in development Interview Questions:Write a simple calculator. Code implementation: Abstract An operation class: Package COM. qianyan. calcuator; public abstract class operation {// number one private double num1; // number two private double num2; Public double getnum1 () {return num1;} public void setnum1 (double num1) {This. num1 = num1;} public double getnum2 () {return num2;} public void setnum2 (double num2)

The dashed box represents the interface, the solid wireframe represents the entity class, The thick wireframe represents the most commonly used entity classes, the dashed arrows indicate the implementation of the interface, and the implementation arrows indicate that the class can make objects of the class that the arrows refer to. Collection: Allows only one object to be placed in each location. It includes a list of "holding a set of objects in a certain order", and a set that "only allo

difference between the 5.sendRedirect () and Forward () methods?The Sendredirect () method creates a new request, and the forward () method simply forwards the request to a new target. After redirection (redirect), objects that were within the scope of the previous request are invalidated because a new request is generated, and after forwarding (forwarding), objects within the scope range of the previous request can be accessed. Sendredirect () is generally considered to be slower than forward

Interview points:CClassical language interview questions CAnalysis of language interview questions 5I. Typical questions about C language pointers A) An integer)B) a pointer to an integer (a pointer to an integer)C) a pointer to a

Test Questions // Write a function to flip the string. The flip method is as follows: "I am a student" is reversed to "student a am I" without any library function. It is said that this question was frequently used in a written test or interview. I just saw this question in my book, and I saw it again in the blog Garden ("Publish a typical interview

This section contains questions about XML in Java, JDBC interview questions, regular expression interview questions, Java errors and exceptions, and serialized faces .125) What is the d

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Latest Android interview questions and Android interview questions Recently, I want to change my job for some reasons. I want to sort out some questions that I think are worth recording during the interview and give them a referen

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Summary of vue interview questions and vue interview questions What is the underlying principle of vue? Communication between vue components? How many methods are used to determine the Data Type in JS? The most common judgment method is typeof. Method for judging known object types: instanceof Constructor: constructor

Spring Interview Questions and Answers, Spring interview questions Spring Overview 1. What is spring? Spring is an open source development framework for java Enterprise applications. Spring is mainly used to develop Java applicati

Android interview questions (2) and android interview questions 1. What is the difference between int and Integer? Java provides two different types: The reference type and the original type (or the built-in type ). Int Is the original data type of

Unity comprehensive interview questions (including answers) and unity interview questions 1. What is a collaborative program? Enable another logic processing when the main thread runs to assist in the execution of the current program. The coroutine is like multithreading, but not multithreading, the Unity coroutine che

5 typical JavaScript interview questions and javascript interview questions Companies in the IT industry still have high requirements for JavaScript developers. However, if the skills and experience of JavaScript developers reach a certain level, they can easily jump to excellent companies, of course, the salary is no

Android interview questions (3) and android interview questions 1. Describe the lifecycle of an Activity. Activity lifecycle methods include:OnCreate (), onStart (), onReStart (), onResume (), onPause (), onStop (), onDestory ();Visible life cycle: from onStart () to onStop () called by the System ()Foreground

Check for missing vacancies 2 (Small interview questions), check for missing vacancies 2 interview questions // Interview public class Main {class demo {} public static void main (String [] args) {new demo (); // error, because the main function is static, class demo must be

Interesting IT interview questions and interesting IT interview questions A piece of C code looks simple, and the expected result is the output array. #include After the code is compiled and run, the result is not the desired array, but a null value. Many people will think of macro definition, because macro definitio

SQL server interview questions, SQL SERVER interview questions I went to the interview today and got caught by a small database problem. I am ashamed and brave. SQL interview questions