java debugging questions

In this article we will discuss various types of face questions in a Java interview that will allow employers to test the candidate's Java and common object-oriented programming capabilities. The following chapters are divided into two, the first one will discuss object-oriented programming and its features, about Java

Analysis of the Java2 Programmer examination (SCJP) -- Linux general technology-Linux programming and kernel information. The following is a detailed description. Preface Whether you are a newbie or an expert in programming, you will be amazed by the Infinite Charm of Sun's Java. Java brings you more than just the advantages of object-oriented, open, platform-independent, easy-to-use, secure, and "Write on

ObjectiveAbout winning in the interview of the Java series of basic collection and finishing, all the topics are carefully selected, very basic and test candidates for the basic skills, should say that the chances of being interviewed is very large. Here sorting out for everyone to take a look before the interview, all the topics collated from the network, there are some errors and clerical error, thanks to the reader's enthusiastic correction, in the

ObjectiveAbout winning in the interview of the Java series of basic collection and finishing, all the topics are carefully selected, very basic and test candidates for the basic skills, should say that the chances of being interviewed is very large. Here sorting out for everyone to take a look before the interview, all the topics collated from the network, there are some errors and clerical error, thanks to the reader's enthusiastic correction, in the

is the object, stack memory storage object reference, the string "ABC" is stored in the heap memory, and S1,S2 as the object reference is stored in the stack memory. Public Final class String Implements Javaio. serializable, comparablestring >, charsequence { Private Final char value[]; Private final int offset; Private Final int count; private int hash; columns such as: string string = "ABCDEFG"; String.charat (2) = ' l '; this

More Java interview written paper series:Java interview written test stationHow does the 1.Java hashmap work?HashMap is a key value for the data structure, each key will have a corresponding value, the key is to identify such a value.HashMap based on the hashing principle, we store and retrieve objects through the put () and get () methods. When we pass a key-value pair to the put () method, it calls the Ha

by invoking the service () method separately for each request, and finally calls the servlet (translator Note: This should be the servlet instead of the server) destroy () method to remove the servlet. What are the advantages of object-oriented software development?Reference answerCode development is modular and easier to maintain and modify.Code reuse.Enhance the reliability and flexibility of your code.Increase the understandable nature of the code.Object-oriented programming has many impor

separately, which belongs to the salvage function operation.Interview question: Please explain the difference between ArrayList and Vector.· These two classes are subclasses of the List interface;· The Vector class is provided at JDK 1.0, and the method of operation provided is synchronous, so it is thread-safeThe Operation class;· The ArrayList class is provided at JDK 1.2, and the method provided is asynchronous, so it belongs to the non-linearProcess-safe Operation classes.If later in develo

Java basics: 1. the scope is public, private, and protected. A: The differences are as follows: Scope: current class, same package, Child class, other package Public √ Protected √ × Friendly √ ×× Private √ ××× The default value is friendly when no data is written. 2. Can anonymous inner class (anonymous internal class) be extends (inherited) other classes or implements (implemented) interface (Interface) A: anonymous internal classes are internal clas

In a typical Java interview, the interviewer asks the basic concepts of the thread, such as: why you need to use threads, how to create threads, and how to create threads better (for example, inheriting the thread class or calling the Runnable interface), And then gradually asked what concurrency problems were like in Java concurrency programming, Java memory mod

. The Array does not provide as many functions as ArrayList, such as AddAll, RemoveAll, and iterator. Although ArrayList is obviously a better choice, there are times when arrays are useful, such as the following three scenarios.(1) If the size of the list has been specified, most of the cases are stored and traversed.(2) for traversing the base data type, although collections uses auto-boxing to alleviate the encoding task, working on a list of basic types of a specified size can also become sl

The basic course of Java language programming Practice Study Questions Reference answers 1th Chapter Java Programming Overview 1.9 Practice Study Questions 1, the Java running platform includes three versions, please select the correct three: () A.

adds 1/2 to its floor.27, String s = new string ("XYZ"), and several string Object created?Two28, Design 4 threads, of which two threads add 1 to J each time, and two threads to J for each reduction of 1 per second. Write the program.The following program implements threads using an internal class, and does not consider order issues when adding or subtracting J.public class threadtest1{private int J;public static void Main (String args[]) {ThreadTest1 tt=new ThreadTest1 ();Inc Inc=tt.new Inc ()

(garbage collector), but the memory in the heap is not released immediatelyE. Local variables: By declaring in a method, or a piece of code (such as a For loop), execution to it in the stack to open up memory, when the local variable one but out of scope, memory immediately releasedThe implementation principle of Java polymorphismA. In abstract terms, polymorphism means that the same message can be used in a variety of different ways depending on the

The first one discusses object-oriented programming and its features, common questions about Java and its functionality, Java collection classes, garbage collectors, this chapter focuses on exception handling, Java applets, SWING,JDBC, remote method Invocation (RMI), servlet, and JSP. Exception handling

.char variable?Save Unicode to save Chinese characters20. Start a thread with run () or start ()?Start ();Run () put the executed code insideThird, intermediate simple answerWhat is the difference between 21.sleep () and wait ()?Sleep to the time to wake upWaiting to wake up22.JDBC How do transactions work?Set JDBC Auto-commit false to open transactions after multiple transactions commit exception rollback rollbackHow do I access the database in 23.Java