Programmer Think

1. Introduction In real life, there are often complex interaction relationships between many objects. This interaction relationship is often a "mesh structure", which requires each object to know the object it needs to interact with. For example, everyone must remember the phone numbers of all his or her friends; Moreover, if someone ...

summary As shown in the figure above, a software is designed for addition and subtraction calculation. Our first idea is to use tool classes to provide corresponding addition and subtraction tools and methods. //Used to add two integers public static int add(int a,int b){ return a + b; } //Used to add two integers public static int add ...

Implementation of three-point menu list in the experiment of fundamentals of mobile application design Experiment Name: Implementation of point menu list Tools, software and environment used: JDK1.8，Android Studio 1, Purpose of the experiment: Further understand the use of various Android controls, deepen the use of control propert ...

Foreword Azexplosion, a particle crushing effect component based on Android platform( https://github.com/Xieyupeng520/AZExplosion ), the functional migration and reconstruction of Hongmeng are realized. The code has been open source to( https://gitee.com/isrc_ohos/azexplosion_ohos ), welcome all developers to download and use and put forward v ...

1. Analyze the disadvantages of traditional methods Let's first look at the problem of cloned sheep: Now there is a sheep tom, whose name is tom, age is 1, and color is white. Please write a program to create 10 sheep with exactly the same attributes as tom sheep. Using traditional methods: 1. Create entity class package com.xzz; public ...

Singleton design pattern Introduction to single example design mode The so-called class singleton design pattern is to take certain methods to ensure that there can only be one object instance for a class in the whole software system, and the class only provides a method to obtain its object instance (static method). For example, Hibernat ...

Before right meta The understanding of the label is only <meta charset="UTF-8"> And mobile end palatability <meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/> form The meta tag has two attributes: http equiv attribute and name attribute 1. name att ...

Prepare the duck project, and the specific requirements are as follows: There are all kinds of ducks (such as wild duck, Peking duck, water duck, etc. ducks have all kinds of behaviors, such as barking, flying, etc.) Display duck information 1. Analysis and code implementation of traditional solutions to duck problems Traditional desi ...

1. Introduction Everyone makes mistakes and hopes to have a "regret medicine" to make up for their mistakes and start over, but the reality is cruel. In computer applications, customers also often make mistakes. Can we provide them with "regret medicine"? Of course, it is possible and necessary. This function is realized by ...

The lightweight preference database in Hongmeng system is mainly used to save some common configurations of applications. The data is stored in local files and loaded in memory, so the access speed is faster and more efficient. Let's look at the demo video of this article first: Preference The first is to realize the basic function. pu ...