Java

One: OSI modelOpen System Interconnection interconnectTwo: TCP/IP layered modelTCP on behalf of Transmission Control Protocol: Transfer Protocol allows reliable communication before two programsUDP on behalf of Subscriber message Protocol: User

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.Problem solving idea One:Before we had mergetwolists (ListNode L1, ListNode L2) method, the direct call, need k-1 the call, each call needs to produce

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set is:"((()))", "(()())", "(())()", "()(())", "()()()"Problem solving idea One:By observing the situation of

1, when the elements are arranged, the elements need to be compared, so the comparable interface needs to be implemented. That is, >. Further, if the type to be compared can be compared with its parent type, it needs to be written as: , wherein

summary:synchronized and unsynchronized collections, Properties-in Many applications, there is no need for synchronization, so the collections API doesnot provide it by default. Instead, you can create a synchronized version of any collectionUsing

Question: the equation of GuessLook at the following equation:--x--=--x---It means: two double-digit multiplication equals a two-digit number multiplied by a three-digit number.If there are no qualifying conditions, there are many examples.However,

Given a list of non negative integers, arrange them such that they form the largest number.For example, given [3, 30, 34, 5, 9] , the largest formed number is 9534330 .Note:the result May is very large, so you need to return a string instead of an

Merge sorted linked lists and return it as a new list. The new list should is made by splicing together the nodes of the first of the lists. Thinking: Create a new ListNode for storage, Java implementation is as follows:static public ListNode

Today reviewed the Java Network programming this aspect (actually did not learn before), before Linux under the C to do some examples, but not for a long time no use also forget all. I don't know what C + + is not very good to remember, or did not

The title is here: https://leetcode.com/problems/3sum/"Label" Array; Pointers"Personal Analysis"Frankly, this problem card half-day, the first time do not, copy others. After a long time, the second time, or not ... Several times are time Limited

There are no iterators in the map, so how do the elements in the map get out?There are two ways of doing this:One is through set KeySet ()One is through Set > EntrySet ()KeySet:: All the keys in the map are stored in the set collection. Value can

Using enumeration classes to describe traffic lights1, traffic lights include: red, yellow, green light2, the next lamp: green, red, yellow light3. Each kind of traffic light has a certain time respectively.You can also use an enumeration class to

Client:1. Using the Socket classif (socket = = NULL) Socket = new Socket (address, 2333);Do not use ports prior to 10242.socket communicates through OutputStream and InputStream operations if NULL ) new PrintWriter

Import Java.util.*;import java.text.*;class chinesedate{private Calendar aday; public chinesedate (int, Int. Month,int day) throws mydateexception{//this.aday= new Calendar ();//No, because Calendar is abstract class/ /this (); This.aday = Calendar.

Questions:Declaring a color classColor. A color consists of (red, green, blue) ternary color values, calledRGBvalues. Aintintegers can represent a color, with the structure: the highest byte full1, followed by3bytes are stored in "red, green, blue"

5.1 (encapsulation, test), 5.1 encapsulation Test Program source code (simple Java version ):   Package arrays. myArray; import java. util. required; public class SortObject {private static int intercePosition = 0; // record the length of a single

Java-ThreadLocal mode and OSIV mode (53), threadlocalosiv ThreadLocal: maintain local variables of the thread. ThreadLocal is not a thread. It is a Map. Objects can be saved. The object it saves is only related to the current thread. If you do not

Each programmer must have 20 Codes and 20 codes. Naming is required everywhere in the code. As a programmer, We have to name classes, variables, functions, parameters, namespaces, and so on. Below are 20 tips to help you improve your naming skills.1.

Concurrency model-shared memory model (thread and lock) Theory and Model Theory Here we use Java threads and locks for parsingShared Memory ModelI have worked in java Development and understand thread security issues. To ensure that a piece of code

High concurrency connection to redis in jedispool When the java end uses the jedispool to connect to redis, it often gets stuck in high concurrency, or reports connection exceptions, JedisConnectionException, or getResource exceptions. Pay attention