java interview questions multiple choice

The resume has some Ajax and struts issues.Growth strategy for database primary keyThe type of struts?Why use the difference between struts;session and cookies,Introduction to AjaxWhat are the built-in objects for 1.jsp?Four scopes for 2.jsp3. "". What is the difference between equals A and A.equals ("")?What is the difference between get and post for a 4.form form submission?What is the difference between 5.Cookie and session?How do 6.mysql and Oracle's primary keys come into being?7. Why use S

position, filling the original AI (i), the AI value inserted into the space after the shift of J * * This implementation of a card from I, inserted into the exact position. Loop through the process sequentially, and each element of the loop is eventually inserted into the position it should be in, thus sorting is achieved. * [1, 2, 4, 5, 6, 7, 9, 3, 8] * [1, 2, 3, 4, 5, 6 , 7, 9, 8] * @param array * @param up */Public static void Insertsort (Int[] Array, Boolean up) {for

(); - } - - Public BooleanIsEmpty () {///Bottom call is LinkedList's IsEmpty () method to determine if the set internal data is empty - returnlink.isempty (); in } -}(2) test of Mystack:1 Packagecn.itcast_05;2 3 /*4 * Test of Mystack5 */6 Public classMystackdemo {7 Public Static voidMain (string[] args) {8 //To create a collection object9Mystack ms =NewMystack ();Ten One //adding elements AMs.add ("Hello"); -Ms.add ("World"); -Ms.add ("

and class have the same name. A class can have multiple Constructors The constructor does not return values. The constructor is always used with the new operator. 8. Overload: when multiple methods have the same name and contain different parameters, the overload occurs. The compiler must select the method to call. 9. package Java allows one or more classes to b

manifestations of Java polymorphism. Overriding is a manifestation of the polymorphism between the parent class and the Child class, and overloading is a manifestation of the polymorphism in a class. If a subclass defines a method with the same name and parameter as its parent class, we say this method is overwritten ). When a subclass object uses this method, the definition in the subclass is called. For it, the definition in the parent class is "bl

Java Algorithm interview questions: Write a Singleton, javasingleton Package com. swift; public class Singleton {public static void main (String [] args) {/** write a Singleton */ORC_Hungry.getOrc (). fun (); ORC_Lazy.getOrc (). fun () ;}} class ORC_Hungry {// hungry Chinese private static ORC_Hungry orc = new ORC_Hungry (); private ORC_Hungry () {} public stati

longer executed.(2) But in the case of a hash collision, the first two conditions are established, and then the last equals must be used to determine the equality of the objects.A 3.hash collision scene?(1) Generally appears in large data situations(2) The generation method of Hashcode is weak (such as the artificial production hashcode above)Summary: This chapter mainly through the introduction of hash collision once again in-depth understanding of hashmap work principle.This chapter is here,

many occurrences in the array are greater than half @Test public void Test () {int[] num = {1,2,2,2,2,2,2,4,2,4,6,4,2,6,8,2,7,7}; SYSTEM.OUT.PRINTLN (Morethanhaft (num)); } public int morethanhaft (int[] num) {int result =-1; int times = 0, for (int i=0;iTopic Eight:Determines whether an array is the stacking order of another stack @Test public void Test () {int[] num = {1,2,3,4,5};//int[] num1={1,2,3,5,4}; int[] num2={2,1,5,3 , 4}; stackTopic Nine:Draw 5 cards from poker, 0

Today, I found the java interview programming questions in the Forum and thought about it. I found that I forgot my original programming basics. Question: How many equals 2x8 in the most efficient way? Along with the targeted thinking, I thought of 2x8. Later I thought that this efficiency was definitely not the best. think of the concept of a computer system,

1. String S1 = ' 123 ';String s2 = new string ();2. The difference between two ways of implementing multithreadingInheriting the thread and implementing the Runnable interface3. Single-column design mode What's the difference between lazy and a hungry man? * * *Lazy style Features: lazy loading. Delayed loading in multi-threaded security problems, through the addition of synchronization to solve, plus synchronization efficiency is low, with a double-judge method to solve the low efficiency. The

You can only manipulate a type to invert without a generic typeThe code is as follows: Packagecom.swift.fanxing;Importorg.junit.Test; Public classRenyireverse {@Test Public voidTest () {intarr[]=New int[] {1,10,6,9,2}; Reverse (arr); } Public voidReverseint[] arr) { for(inti=0;i) { inttemp=Arr[i]; Arr[i]=arr[arr.length-1-i]; Arr[arr.length-1-i]=temp; } for(intX:arr) {System.out.println (x); } }}Generic functionality can

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

the original data type of Java, and integer is the encapsulation class provided by Java for int. Java provides encapsulation classes for each original type. Original Type encapsulation class Boolean Char character Byte byte Short short Int integer Long long Float float Double double The behavior of the reference type and the original type is completely different

the original data type of Java, and integer is the encapsulation class provided by Java for int. Java provides encapsulation classes for each original type. Original Type encapsulation class Booleanboolean Charcharacter Bytebyte Shortshort Intinteger Longlong Floatfloat Doubledouble The behavior of the reference type and the original type is completely different

I was also reading the interview book while learning the video. The record is as follows: 1. LostAfter learning the 2010java high-tech video from Teacher Zhang Xiaoxiang for so many days, he looked at generics, reflection and other things and turned his mind away. He just learned that none of the Main Lines dragged me. That is to say, I am eager to know what major technologies will be required for future development and what is the core of

11. Is a bitwise operator. Is a Boolean logical operator. For example: 1 0 = 1; I> 0 I! = 3; 12. Differences between hashmap and hashtable.All belong to the map interface class, which maps the unique key to a specific value.The hashmap class is not classified or sorted. It allows a null key and multiple null values.Hashtable is similar to hashmap, but does not allow null keys and null values. It is also slower than hashmap because it is synchroni

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

each original type. Boolean booleanchar characterbyte byteshort primitive int integerlong longfloat floatdouble reference type and original type behavior are completely different, and they have different semantics. The reference type and the original type have different features and usage, they include: size and speed problems, which type of data structure is stored, the default value specified when the reference type and original type are used as instance data of a class. The default value of

two bytes, so a char variable is also occupied by two bytes. Two Java Basics 1. Talk about polymorphic forms of expression. (1) Overloading, overriding, overloaded overload means that there can be multiple methods with the same name in the same class, but the argument lists for these methods are different (2) overriding override means that a method in a subclass can be exactly the same as the name and para

Class fuck {static {system. out. println ("this is static");} public fuck () {system. out. println ("this is gozao");} public void S () {system. out. println ("this is parent") ;}} public class test08 extends fuck {public static void main (string [] ARGs) {fuck d = new fuck (); D. S (); Fuck SV = new test08 (); Sv. S ();} public void S () {system. out. println ("this is Son ");}} The above is a typical interview instance, also as a JavaProgramYou mus