Abstraction occupies a very important position in object-oriented programming, we often talk about in the abstract, but what is in the abstract object-oriented sense? How can we use a simple way to understand abstract skills? This is what I want to try to do things in this article.
Abstraction occupies a very important position in object-oriented programming, we often talk about in the abstract, but what is in the abstract object-oriented sense? How can we use a simple way to understand abstract skills? This is what I want to try to do things in this article.
Probably would be so written in the textbooks: 'the object is to simulate real-world things and make abstraction. 'Or' abstract is to identify the key characteristics used to describe the real world '; Well, for starters an object-oriented programming terms, these two words is probably not so easy to understand, so I would like to cite some real examples of analogy, we want to help.
Abstract fact, not so terrible, basically the human brain has a way to run part is abstract, for example, you see a dog, whether it is a long-haired shepherd or Pekinese snub-nosed head long nose, leg length is comparable to Chen Sixuan Afghan hound or will short legs such as sausage, black and white or yellow Dalmatians, you can tell that it is a dog, if your mental and intellectual state to fall within the normal range, usually less likely to put the Persian mistake think dogs; there are some fixed image classification in normal adult brains of dogs, in fact, that is the definition of our minds there is a dog abstract patterns, they meet this type will be determined as a dog, of course, because of this abstraction is not so accurate, it may occasionally be mistaken for coyotes will puppy.
Map is another example of abstraction, here this is my snapshot from Google Map down the map, part of this red box shows the location of Chinese Taipei World Trade Center is located, so the key features of the map to be described is Chinese Taipei position in the World Trade Center which side, and therefore it does not need to grow a real world out exactly the same World Trade Center, just a way to express to the plane next to the World Trade Center neighboring the way there Evergreen Terrace, Springfield Lutheran, Jhuangjing Road and Keelung Road section, the Grand Hyatt Hotel is just next to it.
Western art from abstract to talk about is another example of what I like, though in fact I am not so understand art, but this example is very interesting, abstract talk about abstract take it.
The above image is a work -Portrait Cubist master Pablo Picasso of Dora Maar, your eyes see what the key features?
Cubist painter good at drawing things with a multi-angle, you can look at this picture of a woman's face image is actually a combination of the two angles - one positive, the other is the side I see is Picasso's use of such tactics declaration that the world is a three-dimensional world, which compared 2.5D perspective of the Renaissance used for three-dimensional emphasis on the more obvious, so the key feature of this painting is his I want to say: this is actually a three-dimensional world, and you have many different angles to look at one entity.
This is followed by painting works -Nude surrealist master Duchamp Descending a staircase No.2 (Chinese translated Nude Descending a Staircase No. 2).
Duchamp tried to explain what? That is a key feature of this work is it? Certainly not nude, because fundamentally I do not see the characters in the paintings without clothes; Du Xiangli with multiple images (with a similar negative effect of repeated exposure) depicts a naked woman down the stairs of each specific time (?) image point, he wanted to express the key feature is the concept of time, the time when he spread flat on the canvas a second time space as Einstein said: 'in the past, the present and the future but lingering distinction illusion. 'Means the past, present and future co-exist, there is a three-dimensional world and once the time.
So 'key feature' in a nutshell is what you want to express, lists key features of abstraction is doing, which is the basis of design skills class.
Original: Large columns on abstract thing this file