java object oriented interview questions

This is the topic discussed during the last interview and is recorded.Spring Why use Spring? What are the benefits of IoC? What are the benefits of scalability? How to instantiate a Bean? What is the difference between ApplicationContext and BeanFactory? How can I read external files through Spring? Can Bean IDS be repeated in the Spring configuration file? What is automatic assembly and type check in Spring? Can ApplicationContext be loaded

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 i

implementation of the map interface introduced by Java 1.2.Perhaps the most important difference is that the hashtable method is synchronous, while the hashmap method is not. This means that, although you can use a multi-threaded application without taking any special actionsProgramUse a hashtable, but you must also provide external synchronization for a hashmap. A convenient method is to use the static synchronizedmap () method of the collections cl

1, what is the hibernate of the concurrency mechanism. How to deal with concurrency problems. Hibernate concurrency mechanism: A, Hibernate session object is not thread-safe, for a single request, a single conversation, a single unit of work (that is, a single transaction, a single thread), it is usually used only once, and then discarded. If a session instance is allowed to be shared, those that support concurrency, such as HTTP request,session b

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executing the Wait,sleep,join method will throw interruptedexception, if the normal state, we can through isinterrupted () =true, To stop the thread from using the return method.(vii) Start and run methods for threadsNote that for a thread to run, only the Start method is executed, this method is the native method, the Run method is where we define the task, and a separate call to the Run method is the same as invoking the normal method. The Start method can only be called once, and more than o

This is the topic discussed during the last interview and is recorded. Spring Why use spring? What are the benefits of IOC? What are the benefits of scalability? How to instantiate a bean? What is the difference between applicationcontext and beanfactory? How can I read external files through spring? Can bean IDS be repeated in the spring configuration file? What is automatic assembly and type check in spring? Can applicationco

Transformation from jmigrating to OO programming with Java technology to Java Object-Oriented Programming Technology

used by the EJB factory to create and remove EJB instances. 9. Describe the EJB activation mechanism in detail.A: Taking stateful Session Bean as an example, the cache size determines the number of bean instances that can coexist in the memory. According to the MRU or NRU algorithm, instances are migrated between the activation and deactivation statuses, the activation mechanism is that when the client calls a business method of an EJB instance, if the corresponding EJB

(intx = 0; x ) { - //Invoke function - intnum =getrandom (start, end); - //Output Results - System.out.println (num); in } - } to + /* - * Write a function two explicit: return value type: int argument list: int Start,int end the */ * Public Static intGetrandom (intStartintend) { $ //think back to the random numbers we talked about between 1-100.Panax Notoginseng //int number = (int) (Math.random () * +) + 1;//(int) (Math.r

Before studying the design patterns of object-oriented design, I had a vague understanding of Java interfaces and Java Abstract classes. When I first learned the Java language, it was hard to understand why the concept of interfaces was required. Although multi-inheritance c

This is the topic discussed during the last interview and is recorded. How can I put an object in hashtable and rewrite it? How to implement it? Implement a singleton mode? Thread synchronization, delayed loading, and generics are required. Design and implement a cache management module, which requires that 10,000 objects can be cached. Design and implement a log module. Design and implement an

In the absence of a good study of object-oriented Design Before the design pattern, I had a vague understanding of Java interfaces and Java Abstract classes. When I first learned the Java language, it was hard to understand why the concept of interfaces was requ

Talk about final, finally, finalize the difference final-modifier (keyword) If a class is declared final, it means that it cannot derive a new subclass and cannot be inherited as a parent class. Thus a class cannot be declared as abstract and declared final. Declaring a variable or method final can guarantee that they will not be changed in use. A variable declared as final must be given an initial value at the time of declaration, and can only be read and not modified in future references. A m

Because I often go to the personal blog of the master Martin Fowler and occasionally find that the blog is recommending this book.At the same time, after two years of distributed system development in CB, I feel that it is time to summarize some of the cases I have learned and encountered. So I thought, you may want to verify whether our system has a major design problem while studying this book. Pattern Oriented Software Architecture volume.4 summar

JAVA basics: use Java to start Object-Oriented Programming-general Linux technology-Linux programming and kernel information. For more information, see the following. Are you switching from traditional procedural programming to object-or