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This article introduces the knowledge points related to object-oriented programming (encapsulation, polymorphism), learning together and making progress together For a Python column, see: Life is short - I learn python Article Directory 1. Packaging 2. Polymorphism Class and instance attributes 4. Static an ...

Preface Huang Hansan has returned and has not updated his blog for nearly half a year. This half year's experience is really not easy. At the moment of the epidemic, the company I interned with did not share difficulties with the employees and directly dismissed many people. As an intern, I was also relentlessly dismissed.So I have to get read ...

Value of border style: none no dotted dot dashed dotted line Solid solid line Double double solid line margin: If two adjacent elements have outer margins set in the vertical direction, the outer margins will be merged Merge height = the larger of the two outer margins that merge Actual height of element = top border + top inner margin + co ...

Use sendEmptyMessage(int what) in Handler to send message Click the button to send the message and process the message in the Handler. Only one message with the what attribute is sent. case R.id.button1: new Thread(new Runnable() { // Check the Handler's api, which has several ways of sendMessage() ...

After decades of busy, today finally have time to write blog. The previous chapter introduces the content related to the working mode of the template, as well as the templates of all the controls under the FrameWorkElement. Next, I'll show you how to build a simple custom button and learn some details about the control template in the process. ...

I have a collection of back-end servlet s, which is not a specific object, but also a double loop. <% List list = (List) request.getParameter("list"); So we can't do this again in JSP pages for(int i=0;i<list.size()；i++) Because. size() is not available. Tag with JSTL c: The items property of the fo ...

Instruction is to drive DOM behavior with data and simplify DOM operation. Common instructions are as follows v-text innertext, cannot parse html tags in text v-html innerhtml, which can parse HTML tags in text v-show controls the display and hiding of elements v-if, v-else-if, v-else meet the conditions to display the corresponding eleme ...

1 Introduction to reflection mechanism The reflection mechanism of Java refers to that in the running state of a program, you can construct an object of any class, understand the class to which any object belongs, understand the member variables and methods of any class, and call the properties and methods of any object. This dynamic access to ...

This is the rendering. It seems very simple. Have you been writing Jquery code for a long time, always thinking about DOM operation? I haven't switched over for a long time. Finally, Vue's attributes are used for control, and the function of multiple attribute selection is realized Directly on the source code! index.html <!DOCTYPE htm ...

vue custom panel instruction In the development of the project, many panels with mask layer are used. These panels are rigid, fixed in size, fixed in position, unable to minimize and so on. I would like to use a vue custom instruction to solve these problems. For any panel, just add a v-panel instruction to the panel e ...