loading

类加载(Class Loading)过程

拥有回忆 提交于 2020-03-05 21:11:44
概述 虚拟机把描述类的数据从Class文件加载到内存、并对数据进行校验、转换解析和初始化,最终形成可以被虚拟机直接使用的Java类型。 在Java语言里,类型的加载、连接和初始化过程都是在程序运行期间完成的。 每个Class文件都有可能代表着Java语言中的一个类或接口 Class文件 是一串二进制的字节流,无论以何种形式存在 类加载的时机 加载、验证、准备、初始化和卸载这5个阶段的顺序是确定的 对于初始化阶段: 虚拟机规定了有且只有5种情况必须对类进行初始化(而加载、验证、准备自然需要在此之前开始): 1,遇到new 、gestatic、putstatic或invokestatic这4个字节码指令时,如果类没有进行过初始化,则需要先出发其初始化。 如:使用new关键字进行实例化对象时、读取或设置一个类的静态属性 (被final修饰、已在编译期把结果放入常量池的静态字段除外),以及调用一个类的静态方法时。 2,使用java.lang.reflect包的方法对类进行发射调用时,如果类没有进行过初始化,则需要先出发其初始化 3,当初始化一个类时。如果其父类还没有进行过初始化,则需要先触发其父类的初始化 4,当虚拟机启动时,用户需要指定一个要执行的主类(包含main方法),虚拟机会先初始化那个主类 5,。。。 数组类本身不通过类加载器创建,它是由Java虚拟机直接创建的。 类加载

css实现酷炫的加载loading效果

牧云@^-^@ 提交于 2020-02-26 22:21:17
常用的页面加载css效果; 结合以下css效果 可以在页面中通过setTimeout来控制加载时间,时间到了之后然后把加载效果隐藏掉即可 示例如下: .unshow{ display:none; } <!--动态加载效果--> <div class="spinner"> <div class="rect1"></div> <div class="rect2"></div> <div class="rect3"></div> <div class="rect4"></div> <div class="rect5"></div> </div> //正在加载中... setTimeout(function(){ $('.spinner').addClass('unshow'); },1000*5) 原文如下: https://blog.csdn.net/weixin_42532454/article/details/87191438 效果贴图; 1、 2、 3、 4、 5、 6、 7、 8、 来源: oschina 链接: https://my.oschina.net/u/2847877/blog/3157863

Best way to display a loading spinner in Django?

不羁的心 提交于 2020-02-23 08:32:17
问题 What is the best way to display a loading spinner in Django during a relatively lengthy server-side processing task? Is this something that JS/jQuery should handle? If so, how do I get the button click that starts the server-side processing to initiate the spinner? Django novice here, so I appreciate any input. Thanks! 回答1: There are many ways of doing this, I'm going to suggest the simplest: Use an animated gif yes. I know, you're probably thinking, "animated gifs are tacky!" to which I

android loading界面 及 处理

∥☆過路亽.° 提交于 2020-02-10 03:30:49
主要实现效果: -------------- 程序启动,进入loading界面, loading界面显示背景图 及 进度条动画, 后台启动线程进行相应的初始化操作, loading界面更新相应的初始化提示信息, 初始化完成,打开并进入主界面,关闭loading界面, 如果初始化超时,则弹出提示,退出程序。 loading.java ------------ package com.hello; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.Window; import android.widget.TextView; import android.widget.Toast; public class loading extends Activity { int MSG_INIT_OK = 1; int MSG_INIT_INFO = 2; int MSG_INIT_TIMEOUT = 9; boolean isTimeout = false ; TextView tvInfo ; public void

ant table中通过赋值取消选中值

和自甴很熟 提交于 2020-02-07 10:22:57
vue中table <a-table ref="table" size="middle" bordered rowKey="id" :columns="columns" :dataSource="dataSources" :pagination="ipagination" :loading="loading" :rowSelection="{selectedRowKeys: selectedRowKeys, onChange: onSelectChange, fixed: true}" @change="handleTableChange"> </a-table> js部分 methods: { transfer(values){ console.log("清除选中") //values为空数组 this.selectedRowKeys=values; }, } 将selectedRowKeys重新赋值即可改变选中状态 来源: https://www.cnblogs.com/eternityz/p/12271904.html

Which strategy to employ for long to load pages?

女生的网名这么多〃 提交于 2020-02-05 03:24:46
问题 Trying to address the following issue : To provide a progress indicator that will be shown until the navigation target finishes loading. The target being navigated to can take up to 30 seconds for loading as there are images being fetched from different sources on the Internet. Problem lies on handling such task using events of NavigationService or Page as they are always raised before the Page has loaded its content which is done inside the Loaded event. The loading process is asynchronous

fft_w安装-使用遇到的问题

醉酒当歌 提交于 2020-02-04 03:20:38
提示 error while loading shared libraries: libfftw3.so.3.5.7 cannot open shared object file: No such file or directory 解决办法 共享库文件安装到了/lib或/usr/lib目录下, 执行一下ldconfig命令即可 参考: "error while loading shared libraries: xxx.so.x" 错误的原因和解决办法 来源: CSDN 作者: 不知名的小咸鱼 链接: https://blog.csdn.net/qq_42263796/article/details/104157105

php: efficiently running functions with one-time loaded classes multiple times in optional files

爱⌒轻易说出口 提交于 2020-01-25 13:56:13
问题 after reading the responses I have rewritten my question. Let's say I have a theoretical php application that uses objects that do different things. For every page that gets loaded by the application, different scripts will be run. now I made a simple php script that creates a simple object. (this is all made up, I'm just trying to understand this before I code it) $user = new userClass($db); $user->login($credentials); all is fine, and I can even repeat the procedure several times after

php: efficiently running functions with one-time loaded classes multiple times in optional files

浪尽此生 提交于 2020-01-25 13:51:33
问题 after reading the responses I have rewritten my question. Let's say I have a theoretical php application that uses objects that do different things. For every page that gets loaded by the application, different scripts will be run. now I made a simple php script that creates a simple object. (this is all made up, I'm just trying to understand this before I code it) $user = new userClass($db); $user->login($credentials); all is fine, and I can even repeat the procedure several times after

Loading a large number of images from a spritesheet

我与影子孤独终老i 提交于 2020-01-23 17:17:46
问题 I'm attempting to make a simple game of Pairs for Android. Program Structure: Menu.java (Menu activity initially loaded) Game.java (Game activity, started by Menu) GameThread.java (Handles gameloop, calls render process in GameView) GameView.java (Handles all drawing to the screen) Graphics.java (Stores loaded images) The Problem: The game features 15 different types of card, each of which requires around 14 frames for animation (flipping, destroying, etc). I'm currently reading these off a