Java

1, judge the same slope not, y2-y1/x2-x1,y4-y3/x4-x3, the same no intersection, not the same as the intersection of the line to perform the second step;2, set y=ax+b, through the slope can find the value of a, through the coordinates can find the

The title is here: https://leetcode.com/problems/merge-two-sorted-lists/"Tags" Linked ListThe topic "Problem analysis" is the transformation of the merge sort in the Linked list. Not much, directly on the code.1 　　 PublicListNode mergetwolists

Maven Dependency com.alibaba fastjson 1.2.5 Read JSONclassreadjson{ Public Static voidMain (string[] args) {String jsonstr= "{\" one\ ": \" one\ ", \" two\ ": [{\" two_1_1\ ": 2.11, \" two_1_2\ ": 2.12}, {\" two_2_1\ ": \" 2.21\ "

Basic type Size (bytes) Range of values Default value Wrapper type Boolean - True or False False Boolean Char 2 0-216-1 ' \u0000 ' (null) Character

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　A + b　(Sigma (ai^x))% mod1 ImportJava.util.*;2 Importjava.math.*;3 ImportJava.io.*;4 Public classMain5 {6 StaticBigInteger mod=NewBigInteger ("10000000007");7 Public Static voidMain (string[] args)8 {9

The difference between forwarding and redirectionForwarding is server behavior, redirection is client behavior1. Forwarding is done on the server side; Redirects are done on the client2. Fast forwarding speed, slow redirection3. Forward the same

The title is here: https://leetcode.com/problems/valid-parentheses/"Tag" Stack; StringThe topic "Personal analysis" should be considered a classic application of stack. Advanced post-exit (FILO) Structure: The first left parenthesis matches the

1. Write out your familiar open source framework and their respective roles (why SSH is used in the project)Answer: Frame: hibernate,spring,struts1/struts2. Hibernate is primarily used for data persistence, encapsulates JDBC operations, and provides

Package com.util;Import Java.io.File;Import Java.io.FileInputStream;Import Java.io.FileOutputStream;Import Java.io.InputStream;public class Testhtml {/*** Copy individual files* @param oldpath String original file path such as: C:/fqf.txt* @param

Recently learning Java multithreading a little confused, after a day of finishing, know what is the producer, what is the consumer, as well as the relationship between consumers and producers:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00

First, the Environment configuration1. Open the environment variable, advanced system settings, properties, computer, start2, set the environment variables (currently the latest is 1.8.0_25), as follows:To create a new user variable:Java_home

1.About Java coercion Type conversionsint x = 1;Byte y = 2;byte z = 0;1). z = (byte) (x+y);//forced type conversion succeeded2). z = (byte) x+y;//forced type conversion error, loss accuracyThe second way to convert X to byte is to give an

the difference between redirection and forwarding:Redirection and forwarding have an important difference:When forwarding is used, JSPThe container will use an internal method to invoke the target page,New page continues to process the same

This topic leetcode with dynamic planning, but that's O (n^2). I myself came up with an O (n) algorithm and submitted it through.TopicGiven A string containing just the characters ' (' and ') ', find the length of the longest valid (well-formed)

try {Randomaccessfile = new Randomaccessfile (file, "RW");Lock = Randomaccessfile.getchannel (). Trylock ();} catch (IOException e) {E.printstacktrace ();}The following exception occurred:caused By:java.io.IOException:No locks availableAt Sun.nio.ch.

The data types in Java are divided into basic data types and reference data types, basically branching structure as follows:Java Data type:Basic data type:Numeric type:Integer type: Byte:8 bit, data range -128~127, wrapper class: Java.lang.ByteShort:

The attitude of this article: Simple & StupidvolatileUsage:privatevolatile Service.STATE state;Advantages: is simpler than other locking mechanisms (synchronized, lock); Do not block; Variables that are modified for volatile allow

The attitude of this article: Simple & StupidWeak reference Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed. Weak references is most often used to implement

1. Define the interfaceUse interface to define an interface. Interface definition similar to the definition of the same, is also divided into the interface of the Declaration and interface body, which consists of a constant definition and method

I. Overview The Web container is primarily guided by the life cycle of three container objects, namely: Listener/filter/servlet. The general overview is as follows:At the same time, there is a configuration node: Context-param, which is