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Thinking logic of computer programs (91) and thinking 91
In the previous sections, we have discussed Java 7. From this section, we will discuss some features of Java 8, including:
Passing behavior code-Lambda expressions
Function-based data processing-stream
Combined asynchronous programming-CompletableFuture
New Date and Time API
In this section, we will first discuss Lambda expressions. What is it?
Thinking logic of computer programs (36) and thinking 36
In the previous section, we introduced the basic concepts and principles of generics. In this section, we will continue to discuss generics and the wildcard concepts in generics. Wildcards have confusing and confusing syntaxes, but they are widely used in Java container classes. What is it? In this section, let's analyze it gradually.
More concise par
Thinking logic of computer programs (68) and thinking 68
This section continues with the content of the previous section and discusses how to use wait/notify to implement more collaboration scenarios.
Start at the same time
At the same time, it is similar to an athlete's competition. When we hear the game start with a gun, we start at the same time. Below, we simulate this process. Here there is a main thre
Thinking logic of computer programs (1), thinking LogicWhat is the program?
A computer is a machine that consists of CPU, memory, hard disk, and input/output devices. Operating systems run on the computer, such as Windows or Linux, and various applications, such as Word and QQ, run on the operating system.
The operatin
file.Continuous read-only code snippets and read-write data segments, which makes it easy for the loader to page and initialize contiguous areas.At load time, the read-only code snippet and the writable data segment corresponding to the page table are initialized to a page that is not cached (involving the operating system and the principle of composition), pointing to somewhere in the destination file on disk. So, during the program loading process, there is no real load of code and data from
Looking for prime factorsRequires the Smallest-divisor process in the book to find the minimum factor of 199, 1999, 19999.Scheme Code:Main process:Define the process of finding prime numbers 4 , greater than the test value, then it must be a prime number can and 2 Divisible, then not prime, the minimum factor is 2 If not, go back to the process Find-div, and then try to divide it with 2+1, loop #lang Racket (define (square x) (* x x)); Definition filter (define (smallest-div
This section
1. Some traditional methods2. Generate a QR code image from the program code.3. Scan the generated QR code on your mobile phone and convert it to a py script.Preface
Writing scripts on the most mobile phone is a hard task. Although SL4A provides us with the API Quick insertion function, in addition, the elegant Python saves us the trouble of entering semicolons and parentheses, but it does not have intelligent awareness, no keyword completion, narrow buttons, and difficult to enter
The function of an ordered pair is to store two values and then provide again as neededPAIR = x {-y {-f {f[x][y]}}}left = p {p[-x{, y {x}}]}right = p {p[-x{y {y}}]}When I read the first time, I did not understand these lines of Ruby code, and I wrote a JavaScriptPAIR = function (x) {return function (Y) {return function (f) {return F (x) (Y)}}}left = function (p) {return P (function (x) {return function (y) {return x}})}right = function (p) {return P (function (x) {return function (y) {return y}}
Efficient Desktop Connection: [automatically restore folders and programs before the computer is closed]
For many friends, daily boot work is only a continuation of the previous day, so the first thing every day is to restore the computer to the state when it was shut down the previous day. Is there any good way?Day-to-day manual recovery can be said to be time-
Part 8: bios and CMOS FAQs When it comes to bios, most cainiao don't know much about it and dare not try it easily, as if they are naturally afraid of the blue screen, even many old birds cannot distinguish BIOS settings from CMOS settings. Therefore, before writing a Q A question, I think it is necessary to clarify these two concepts to get twice the result with half the effort.BIOS is short for Basic Input/Output System. It is originally intended to be "Basic Input/Output System ". What we u
Thinking logic of computer programs (64) and thinking 64
For file processing, we introduced the stream method, section 57 introduced the byte stream, section 58 introduced the ghost stream, and also introduced the underlying file operation method, section 60 describes random read/write files, Section 61 Describes memory ing files, Object serialization/deserialization mechanisms, and section 62 describes Jav
Thinking logic of computer programs (14), thinking Logic
It is said that Tao shengyi has a second, second, and third life. If binary representation and operation are regarded as one, the basic data type is regarded as two, and the basic data type is regarded as three, then, the combination of classes and the inheritance introduced in the next section make the three born things.
In the previous section, we i
Thinking logic of computer programs (73) and thinking 73
In this section and the following sections, we will discuss the container classes in Java and package. This section describes two simple classes, CopyOnWriteArrayList and CopyOnWriteArraySet, and discusses their usage and implementation principles. Their usage is relatively simple. What we need to understand is their implementation mechanism: Copy-On-
Thinking logic of computer programs (13), thinking Logic
Class
In the previous section, we introduced the basic principles of function calling. In this section and the next sections, we will explore the world of classes.
Programs mainly involve data and operations on data. To facilitate understanding and operation, advanced languages use the data type concept. Di
control the memory, hard disk, and the like. These commands cannot be directly executed by the program to prevent malicious programs from damaging the system, this is a kind of protection for the CPU, and the loop 3 command can be directly called by anyone, and can be used as a user interface.
Programming:
Computer languages include interpreted and compiled languages.
Interpreted language: the source code
Unnecessary programs in Windows How to prohibit the operation, the computer after a period of time will appear some unnecessary procedures, will affect the speed of our computer, if you do not need to prohibit these programs to start on it. But how to forbid it? The following three networks tell you the specific steps.
Thinking logic of computer programs (51) and thinking 51
The previous section describes EnumMap. This section also describes the implementation class EnumSet for the Set interface of the enumeration type. Similar to EnumMap, there is a special implementation class for enumeration types, mainly because it can implement the Set interface very efficiently.
The implementation class HashSet/TreeSet of the Set in
Many friends may think that after the Win7 32-bit system is turned on, only we open the program is the start of the program, in fact, you may wish to try to open the computer's Task Manager window, in the process of this column is not to see a lot of content, actually these are currently starting in the program, that is to say, Many programs are open when we open the computer, then in many
Thinking logic of computer programs (5), thinking Logic
Intuitive fact violations
The reason why a computer is called a "computing" machine is because it was invented mainly for computing. "computing" is of course its specialty. In everyone's impression, computing must be very accurate. But in fact, even in some basic decimal operations, the calculation results a
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