data structures and abstractions with java

DATA_FILE_NAMEBy observing its folder structure, we can see that mapfile consists of two parts, each of which is data and index.Index, which is a data-indexed file, mainly records the key value of each record and the offset of the record in the file.When Mapfile is interviewed, the index file is loaded into memory, and the index mapping relationship can quickly navigate to the file location where the recor

iterator is currently pointing. //Safe iterator is safe, when it is 1, he is safe, otherwise unsafe int table, index, safe; Entry: pointer//NextEntry to the node currently iterated : The next node of the current iteration node, because when the security iterator is operating, the node that the entry only has is likely to be modified, so an extra pointer is needed to hold the position of the next node, thus preventing the pointer from being lost dictentry *entry, *nextentry; Lo

Knowledge Points: 1, using internal class construction node http://www.cnblogs.com/dolphin0520/p/3811445.html;2, node = data field + Pointer field in Java is a reference to replace the pointer;3, the head node is only the first reference variable, no object;4, insertions and deletions are required to traverse. Current=current.nextPackage database;Three elements: Head node node class (

), PC counters (registers, hardware-related)Stack MemoryFor storing variables, the variables are removed from the stack memory immediately after they are used in the stack memory, with a xiemoshalv look. Whenever new is encountered, a space is created in the heap (from 0-n) with an address. For the data in the first default value (0), when assigned to change the value.Heap MemoryUsed to store objects (arrays are a special kind of object). The element

also, but later there is a problem, that the population table has date data, the original input when the wrong, the format is not, resulting in can not insert, the hundreds of thousands of data I can not see a bar, I just put the data into the use, the method is simple, the asterisk for the specific field column name.I pass the street number exists to determine

One of the major drawbacks of the array is that the length definition can no longer be changed, this program implements a dynamic array, similar to the structure of ArrayList in Java, has the function of increment, delete, sort, traverse, enlarge and append.Implementation of dynamic arrays:/*2013 February 16 19:18:35 This program appends, deletes, sorts, and iterates through the elements in the array. The method in

compiler automatically nameThe bytecode file Simple_java.class and stores it in the same directory as the source file. Finally, launch the program by issuing the following command:Java firstsampleTo run a compiled program, the Java Vsan always starts execution and the code in the main method in the class you indicate.2. Comments3. Data TypesIn Java, your use of

Advantages and disadvantages of the 1.XML and JSON two data structures1> XMLAdvantages:? uniform format , standards-compliant? Easy to interact with other systems remotely , data sharing is more convenient ? Disadvantages: XML file format file is large , complex format , transmission consumption bandwidth ? Both the server side and the client need to spend a lot of code parsin

; -ll fat =Getfather (Pre[cur]); +Dis[cur] + =Dis[pre[cur]]; -Pre[cur] =fat; + returnfat; A } at - Chartemp[150000]; - - intMainintargcChar*argv[]) - { - ll N; inscanf"%lld",n); -memset (DIS,0,sizeof(DIS)); to for(inti =1; I i) +Pre[i] =(ll) I; - while(1) the { *scanf"%s", temp); $ if(temp[0] =='O')Panax Notoginseng Break; - if(temp[0] =='I') the { + ll x, y; Ascanf"%lld%lld",x,y); the if(Getfather (y)! =x) + {

of the stack, thread is unsafe.Queue:Specifies the direction in which data is entered and the direction to go, and the data in the queue is always first entered first.The queue only allows elements to be deleted at the front end, and elements inserted on the backend.Loop queue:A queue that is connected to the end, the last element next to the first element.The chained storage structure and implementation o

Dictionary is often called a data dictionary, is a data structure used to hold key-value pairs, such as our daily phone book, is a dictionary. We can access the corresponding value (phone number) by the key (name). In C + + and Java We all use map to build such a dictionary, but the name is different. In JavaScript, an object is like a dictionary, because an obje

In this paper, we summarize the common data structure of Python, and attach examples to illustrate, I believe that readers have some reference value. In general , the data structures common in Python can be collectively referred to as Containers (container). sequences (such as lists and tuples), mappings (such as dictionaries) , and collections (set) are the th

Android development, in JAVA2EE or Android common data structure has map,list,set, but Android as a mobile platform, some API (many are efficiency issues) is obviously not ideal, in the spirit of making better wheels, The Android team has written its own API to replace the Java API Simplearraymap Essentially Arraymap inherited from Simplearraymap, mainly in order to implement a HashMap-like AP

1. The main reference documents: Introduction to AlgorithmsThe foundation of algorithmic design Shen Xiaojun"C + + data Structures""Algorithmic Python"Timus All algorithmic code implementations for this series of posts are python. On the basis of this, some topics will add additional C + +, java. 2. Already finished meat (real-time update) Advanced algorithm Di

1.if can not be added after {}, but not recommended, prone to misunderstanding2. Write the program first anti-stud test, and then write logic, otherwise it will be wrong3.if: A branchif else: two branchesif...else If ...: multiple branches (end without else)4. Note the curly braces5.switch-case (compared to else if):(1). Only integer data types can be judged(2). can only do equivalent comparison, can not do more than less than the comparison(3). Domin

Detailed introduction to the data structure in java and the java Data Structure Maybe you are familiar with it.JavaVarious data structures in the. util packageJavaThe data structure and

mappings? In fact, it is very simple. The answer is Pointer conversion. As mentioned above, Java-layer objects have certain data structures in JVM, that is, object pointers are represented by oop, jobject can be converted as follows. handle is of the jobject type. oop result = *reinterpret_cast It is very convenient to convert it into oop. For example, you can u

Java Core Data Structure summary, java Core Data Structure JDK provides a Set of major data structures, such as List, Set, and Map. These structures are inherited from the

Java runtime data storage mechanism and java Data Storage Mechanism Address: http://yanwushu.sinaapp.com/java_data_storage/ When a Java program is running, it needs to allocate memory for a series of values or objects. Where are these values? What kind of

View the simple table structure and JAVA data structure from the perspective of java Data Structure1. Preface: When we talk about collections in programs, we often come to our minds, such as ArrayList and aggregate list and HashMap. Of course, when talking about ArrayList and rule list, most of us know that ArrayList q