1. System properties System properties are key-value pairs with special meanings in the system. We sometimes need to use system properties during the development process, such as getting the system software version, getting the device name, etc. Sometimes we also need to set custom properties. System properties are global and easy to access. 2. Get […]
Tag: properties
Android–Gradle plug-in gradle-wrapper.properties
1. Android Studio version, Android Gradle plug-in version, Gradle version Android Studio uses Gradle to build code through the Android Gradle plug-in; After each upgrade of Android Studio, the Android Gradle plug-in is automatically updated, and the corresponding Gradle version will also change; Therefore, the following correspondence will be generated: (1) Correspondence between Android Studio […]
Solving errors in web projects, java.io.FileNotFoundException: druid.properties (the system cannot find the specified file); [spring factory decoupling development]
When using Tomcat9.0, spring5.0 framework original factory class decoupling, druid-1.0.9jar version, JDK9, MSQL8 version database to simulate web page login case, an error message that the druid.properties file cannot be found appears, the details are as follows [Case code posted at the end]; Normally speaking, the configuration file is placed under the src directory, and […]
3. Watch listeners, filters and computed properties in vue
watch, computed properties and filters 1. watch (listener) ==1, 1 shallow monitoring== 1.2 Deep monitoring 1.3 Summary 2. filter (filter) 2.1 Local filter 2.2 Global filter ==3. computed(computed attribute)== 3.1 Basic use of computed 3.2 Summary 3. 3 Shopping cart case 1. watch(listener) 1, 1 shallow monitoring Function: Monitor changes in data data grammar: new […]
Vue2 (2): calculated properties, monitoring properties
Article directory 1. Computed properties 1.1 Use interpolation syntax and methods to splice names 1.2 Use computed properties to splice names 1.3 Abbreviation of computed properties 1.4 Summary of computed properties 2. Monitoring attributes-watch 2.1 Weather case foreshadowing 2.2 Lead to monitoring attributes (1). Pass in the watch configuration when new Vue (2). Monitor through […]
Error: ERROR Cannot read properties of null (reading type)
ERROR Cannot read properties of null (reading type’) TypeError: Cannot read properties of null (reading type’) <template> <el-card> <el-row :gutter=”20″ class=”header”> <el-col :span=”7″> <el-input placeholder=”Please enter the product category name…” v-model=”queryForm.query” clearable></el-input> </el-col> <el-button type=”primary” :icon=”Search” @click=”initBigTypeList”>Search</el-button> <el-button type=”primary” :icon=”DocumentAdd” @click=”handleDialogValue()”>Add product category</el-button> </el-row> <el-table :data=”tableData” stripe style=”width: 100%”> <el-table-column prop=”id” label=”#ID” width=”80″ /> <el-table-column […]
Java programming – multi-threading/multi-threading construction/multi-threading properties/thread interruption/thread status/thread waiting
Foreword Sail against the current, if you don’t advance, you will retreat! ! ! Processes and threads What is a process? Answer: A process is the smallest unit for the operating system to allocate resources. It is an instance of a running program, or a dynamic execution of an application. For example, when you open […]
CSS selector, CSS properties related
CSS selector CSS attribute selector Find tags by their attributes. Tags all have attributes. <div class=”c1″ id=”d1″></div> The id value and class value are attributes that come with each tag. There is another type: custom attributes. <div class=”c1″ id=”d1″ username=’kevin’ password=’123′></div> For username=’kevin’ password=’123′ attribute is the custom attribute of div tag Grouping and nesting […]
In-depth analysis of the Properties collection in Java
Hello, friends, hello, I am Meow Shou. Today I want to share with you some knowledge points that I have learned daily, and communicate with you in the form of words to learn from each other. Although one person can go faster, a group of people can go further. I am a back-end development enthusiast, […]
Spring annotation magic: the perfect solution for uniqueness verification of object properties in collections
Spring Boot provides a powerful validation framework, but sometimes we need to create custom validation rules according to our own business needs. This article will introduce how to use Spring Boot custom annotations, validators, and reflection to check whether the value of a certain attribute of each object in the collection is unique. 1. Custom […]