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exploits optimistic concurrency strategies based on conflict detection. As you can imagine, the probability of failure increases exponentially when the number of optimistic threads is very large.Iv. Understanding the volatile modifierIn the Java memory model, there are main memories, and each thread has its own memory (for example, a register). For performance, a thread keeps a copy of the variable to be a
OriginalIn the previous article, the use of such a method:List.foreach (new consumer() { @Override publicvoid Accept (Integer t) { System.out.println (t); } });here 's the point. The foreach method of the List ;/* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. * ORACLE proprietary/confidential. Use are subject to license terms. */package java.lang;import java.util.iterator;import Java.util.objects;import j
Direct Insert SortInsert sort directly int[] Insertsort (int[] a) {for (int i = 1; i Hill SortHill sort public int[] Shellsort (int[] a) { int n = a.length; int gap = n;//array number while (Gap > 0) { gap = gap/2;//reduces the array by half for (int x = 0; x Simple Selection SortingSimple Select Sort public int[] Simplesort (int[] a) { int n = a.length; for (int i = 0, i Heap Sort Heap sort public void heapsort (int[] a) {
(MSG. getcandidate ()). append (delimstr); // total number of votes votebuilder. append (MSG. getvotecount ()). append (delimstr); Return votebuilder. tostring (). getbytes (charsetname );}}
3.5.2 binary representation
The following shows another method to encode the voting protocol message. Unlike text-based messages, the binary format uses messages of a fixed size. Each message starts from a special byte. the maximum value of the byte is 010101. Th
} private String name; private LocalDate birthday; private Sex gender; private String emailAddress; public int getAge() { // ... } public void printPerson() { // ... }}Assume that all users of a social network application are saved in one List instance.We first use a simple method to implement this use case, and then by using the local class, Anonymous inner class implementation, finally through the lambda expression to do an efficient and concise implem
use it? Because it does not work well when multiple threads update properties at the same time. Since A + = B is not an atomic operation, this poses a risk of overwriting other write operations. Before Java8, you need to use Atomicinteger to deal with this situation.Atomicinteger – This set of classes uses CAS (compare and Exchange) processor directives to update the value of the counter. Sounds good, is that really the case? No, it's not. The good side is that it can minimize the execution of
separate implementation class of the ActionListener interface for each event. This code is not elegant, because a lot of code needs to be appended to define a method. Generally, you can create an anonymous internal class wherever necessary, which makes the code more readable.Functional Interfaces Functional interface
First, let's take a look at the definition of the ActionListener interface mentioned above, as follows:
package java.awt.event;import j
how the above list interface Add method in JDK8 is resolved
defaultvoidsort(Comparator
Flip through the list interface's source code, which adds a default method of the defaults void sort (comparator
List
Comparator.naturalorder () is an implementation of a natural sort, where you can customize the sorting scheme. You often see the reason that you can directly forEach using the JAVA8 operation set is also a new de
Java 8 brings a lot of features that can make coding more concise. For example, like the following code:
Collections.sort (Transactions, new comparator
Can be replaced with the following more compact code, the same functionality, but read up with the problem statement itself closer:
Transactions.sort (Comparing (Transaction::getvalue));
The main features introduced in
Reprint: http://blog.csdn.net/u012961566/article/details/78281654To support functional programming, Java 8 introduces lambda expressions, so how do you implement lambda expressions in Java 8?After the lambda expression has been compiled, what exactly does it generate? Before we go into the analysis, let's consider that
1, the computer's memory unit
The data in the computer is represented by 0 and one, and one of the 0 or 1 is called a bit.
8 bits are called a byte (byte), two bytes are called a word (word), and four bytes are called two-word (Dword).
1byte=8bit, 1kb= 1024 Byte, 1m=1024 KB.
2, Java has four categories of 8 basic types
A, 4 kinds of integral type
BYTE 1 byte
Shor
What is the fastest Garbage Collector in Java 8?
OpenJDK 8 has multiple GCGarbage Collector) algorithms, such as Parallel GC, CMS, and G1. Which one is the fastest? What if I change the default GC of Java 8 from Parallel GC to G1 in Jav
is a fast way to pass elements, which means that in this case the element is always in the quickest way from the inserted (producer) to the removed (consumer), which in the multitasking queue is the quickest way to process the task. This feature is also mentioned more in the related chapters of the online pool.In fact, there is also a blockingqueue implementation delayqueue described in "Introduction to concurrent queues and queue", which describes a delay queue. The characteristic of this queu
The use of break in Java, like in C, is used to end the loop, however, what surprised me is the use of return-the end of the current Method!!! Seeing is believing, let's take a look at the code:int i; for (i = 0;i The results are as follows:for (i = 0;i The results are as follows:Compare to discover:There is no output ending***** when using return, why is this?Break is the end of the current
, each of which is processed in a different thread, and the results are then output together.Second,stream in Java 8 Stream, as a highlight of Java 8, is a completely different concept from the InputStream and OutputStream in the java.io package. It is also different from St
Article 2: JAVA character encoding Series II: Unicode, ISO-8859-1, GBK, UTF-8 encoding and mutual conversion
1. Function IntroductionIn Java, a string is encoded in Unicode. Each character occupies two bytes. The two major functions related to encoding are: 1) parse the string into a byte array using the specified enco
Next article: the programmer must know the 8 largest sorting (1) ------- Insert the sorting directly, and the hill sorting (implemented in Java ).
3. Simple selection and sorting
(1) Basic Idea: In the number of groups to be sorted, select the minimum number and the number at the first position;
Then find the smallest number in the remaining number and exchange it with the number in the second position, so
Soon Blue Bridge Cup match, I these algorithms still not, indeed a bit of panic, today morning to sleep late not to get up, then began to study the 8 queen question. This is also a typical backtracking and recursion problem. In fact, and horse tread board problem very similar, eight Queen question, is to judge the main diagonal, diagonal, horizontal and vertical row can not have queen. This is the focus of the problem. Let's take a look at the eight Q
Java 8 new features
Content:1. lambda expressions2. streamAPI3. built-in function Interfaces4. default Interface Implementation Method5. Use lambda/streamAPI in android
========
1. lambda expressions:Several forms:
()->statement()->(statement)()->{statement}
Take Thread as an example:
new Thread(new Runnable(){ public void run(){ }}).start();new Thread(()->{ System.out.println(Thread.currentThread(
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