java data structures interview questions

Notoginseng * When extracting, to prevent an error in exceeding the capacity of the collection, add a method to query whether the next element exists - * @isEmpty is a Boolean type the */ + Public BooleanIsEmpty () { A returnList.isEmpty (); the } + } - $ $ Packagecn_linkedlist; - - ImportJava.util.Iterator; the Importjava.util.LinkedList; - Wuyi /* the please use LinkedList to simulate the collection of stack data

browser stores cookies for each Web server in a local file. Later, when the browser sends a request to a particular Web server, all cookies stored for that server are sent at the same time. The differences between session and Cookie are listed below:No matter what the client browser does, the session should work correctly. The client can choose to disable cookies, but the session still works because the client cannot disable the session on the server.The session and the cookie are not the same

only be performed through the defined interface. Object-oriented computing begins with the basic concept that the real world can be depicted as a series of completely autonomous and encapsulated objects that access other objects through a protected interface.4. Polymorphism:Polymorphism allows different types of objects to respond to the same message. Polymorphism includes parameterized polymorphism and inclusion polymorphism. Polymorphism language is flexible, abstract, behavior sharing, codeB

...4. Empty (the test stack is empty.) Returns false if and only if no items are included in the stack . 5. int search (object o) returns the position of the object in the stack , with a base of 1, and if the object O is an item in the stack, the method returns the nearest occurrence bit from the top of the stack　The distance to the top of the stack, and the distance 1 of the topmost item in the stack. Make the Equals method compare o with the items in the stack ...Queue class :(queue) is a FI

. The algorithm is then filtered up.Note: Up and down, filtering up is only compared with a parent node and stops filtering when it is smaller than the parent node.　　5. Complete Java Heap CodeFirst we need to know some of the main points of using arrays to represent heaps. If the index of the node in the array is x, then:The left child node of the node is 2*index+1,The right child node of the node is 2*index+2,The parent node of the node is (index-1)/

, and clear methods for that collection). But if the iterator calls its own remove method, it is still legal.3.List interfaceThe Java.util package inherits the collection interface. Here are just a few important methods. Public Interface extends Collection{ AnyType get (int idx); AnyType Set (int idx, AnyType newval); void Add (int idx, AnyType x); void Remove (int idx); Listiteratorint poss);}View CodeIndex 0 is in the front segment of the table, size ()-1 represents t

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

First, the realization of the Java_collections tableUnlike C, Java has implemented and encapsulated ready-made table data structures, sequential tables, and linked lists.1, ArrayList is based on the implementation of the array, so it has the characteristics of: 1. There are index values for easy lookups, and for get and set operations, it takes constant time, 2.

Perhaps you have mastered the use of Java. util package inside the various data structures, but I would like to say a Java version of the data structure and algorithms, I hope to help you.Linear table, linked list, hash table is a common

Arrays are the most widely used data storage structures. It is implanted in most programming languages.Basic knowledge of arrays in JavaCreate an arrayThey are treated as objects in Java, so you must use the new operator to create an array:Int[] Intarray;Defines a reference to an array Ingarray = new int[100]; Creates the array, and//sets int array to refer to it

Website access?Cache Strategy 14. What MVC Framework technologies can be used in Java? What are their features and applicable environments?Struts, webwork, spring, JSF... 15. What are the advantages and disadvantages of MVC and what are their applicability?The MVC development mode separates the data access layer and data presentation layer, and enables devel

What is the use of arrays? -When you need to arrange 30 numbers in size, it is a good choice to use data structures such as arrays, and when you are a class head teacher, it is also useful to keep track of the number of absences that students have. Arrays can be inserted, deleted, searched, and so on.1) Creation and memory allocationThere are two data types in

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)

Book Cover Chapter 2 array Problem1. Insert a data item into an unordered array: DA. the time consumed is proportional to the array size. B. Multiple comparisons are required. C. You need to move other data items to provide space. D. No matter how many data items exist, it takes the same time. Solution: unordered array insertion is the only algorithm we have seen

piece of data, which applies to data that is often read but rarely updated* Transactional: This strategy is a fully transactional cache strategy, can be used in JTA environment 7, hibernate inside the sorted collection and ordered collection what is the difference Sorted collection is sorted in memory through the Java comparerThe ordered collection is the 8, hib

1.mysql Date (days) group BY2.servlet life cycle3. Different ways to define string = = and equals4.js string defines a new method5.public Private protected Default Difference6. Multi-threaded scenarios and solutions7. Talk about your knowledge of database affairs.Understanding and usage of IOC AOP in 8.spring9. About Spring's management of beans10. How to use spring-managed beans in code11.hibernate How to define relationships between tables12.hibernate How to execute custom SQL13. Please descri

We write programs in Java, so what is the program? Program is the data structure + algorithm, that is, we write the program is essentially the operation of the data, digital, text, pictures, audio, video These are a form of information, we are programmed to manipulate the data, so as to achieve different functions. Whe

perform these operations. Users do not know how to implement it or how data is stored. For example, the stack users only know the existence of the push and pop methods and how to use them. It is not important for the stack to use arrays or linked lists. The Methods visible to users such as push and pop are called "interfaces ". Use ADT for software design. If you need to store data, consider the operations

Requirements: Compile a function to intercept a string. The input is a string and number of characters, and the output is a string truncated by bytes. However, make sure that no half of Chinese characters are cut, for example, "my ABC" 4, it should be cut to "my AB", input "my ABC Han DEF", 6, the output should be "I abc" instead of "I ABC + Han ". Basic knowledge: First, let's take a look at the basic units:1. bit is a binary bit. For example, 100011 is 6 bits.2. bytes (byte), which is the most

The following questions will be used:4Tables. For details about the fields in these four tables, refer to the following content: Employees (employee_id number (6) Not null, first_name varchar2 (20), last_name varchar2 (25) not null, email varchar2 (25) not null, phone_number varchar2 (20 ), hire_date date not null, job_id varchar2 (10) Not null, salary number (8, 2), commission_pct number (2, 2), manager_id number (6), department_id number (4 ))