java 11.3 Applet Applet 也称 Java 小程序，在支持 Java 的浏览器环境中运行，通常用于在网页中实 现嵌入图片、播放声音等多媒体功能，或添加其他的客户端处理逻辑（如网络计算器）。 严格的说，Applet 是能够嵌入到 HTML 页面中，且可以通过 Web 浏览器下载并执 行的一种 Java 程序。 目前，该项技术在新项目中已经很少使用。 11.3.1 Applet 合和进程控制块三 部分组成。程序用于描述进程要完成的功能，是控制进程执行的指令集；数据集合是 程序在执行时所需要的数据和工作区；进程控制块 (Program Control Block，简称 PCB)， 包含进程的描述信息和控制信息，是进程存在的唯一标志。 进程具有的特征： 动态性 进程是程序的一次执行过程，是临时的，有生命期的，是动态产生，动态消亡 的； 并发性 任何进程都可以同其他进程一起并发执行；

⽜顿迭代法 11 微分 微分被应⽤于机器学习领域 利⽤梯度下降求局部极值 ⽜顿迭代法求函数解： 我们今天研究简单的函数组合 例： 12 微分 函数微分的⼏种⽅式 ⼿动微分：纯天然计算器 缺点：对于复杂表达式容易出错 数值微分： 缺点：计算机⽆法精准表达⼩数，且绝对值越⼤，越不精准 符号微分： Mul(Const(2), Var(1)) -> Const(2) 缺点：计算 : N, y : N) -> N { 3. if x.value() < y.value() { x } else { y } 4. } 13 微分 函数微分的⼏种⽅式 ⼿动微分：纯天然计算器 缺点：对于复杂表达式容易出错 数值微分： 缺点：计算机⽆法精准表达⼩数，且绝对值越⼤，越不精准 符号微分： Mul(Const(2), Var(1)) -> Const(2) 缺点：计算

000,000KB DDR3 呜呜 App内存不足 外卖下不了单 计算机的演化历史 • 一部偷懒的历史 • 硬件“计算机”时代 • 不擅长计算和记忆的人使用工具帮助计算：算盘，计算尺，手摇计算器 • 硬件计算机改进支持的算法，需要变更或重新发明整个硬件，比如让算 盘支持对数 计算机的演化历史 • 改硬件太麻烦了，还慢 • 继电器计算机 • 1937年贝尔实验室：model k •

Applet，昔日的互联网野心！ Applet 也称 Java 小程序，在支持 Java 的浏览器环境中运行， 通常用于在网页中实现嵌入图片、播放声音等多媒体功能，或添 加其他的客户端处理逻辑（如网络计算器）。 严格的说，Applet 是能够嵌入到 HTML 页面中，且可以通过 Web 浏览器下载并执行的一种 Java 程序。 目前，该项技术在新项目中已经很少使用。 大纲 GUI 组件及布局 GUI

(Computer-Aided Design) program has a PCB (Printed Circuit Board) mode, in which the user can create new PCB pads by entering the pad data in a text entry widget. A PCB pad is a rectangular-shaped copper all sorts of connection problems, e.g., connecting electrical signals on a printed circuit board (PCB) or a schematic, or connecting the electric power supply, water supply, or Internet cable between other point, like points drawn on a sheet of paper or the electric signal and power supply paths on a PCB. The latter case is in principle O(n^2) because for a set of n points, there are (n-1) other points

(Computer-Aided Design) program has a PCB (Printed Circuit Board) mode, in which the user can create new PCB pads by entering the pad data in a text entry widget. A PCB pad is a rectangular-shaped copper all sorts of connection problems, e.g., connecting electrical signals on a printed circuit board (PCB) or a schematic, or connecting the electric power supply, water supply, or Internet cable between other point, like points drawn on a sheet of paper or the electric signal and power supply paths on a PCB. The latter case is in principle O(n^2) because for a set of n points, there are (n-1) other points

(Computer-Aided Design) program has a PCB (Printed Circuit Board) mode, in which the user can create new PCB pads by entering the pad data in a text entry widget. A PCB pad is a rectangu­ lar-shaped copper all sorts of connection prob­ lems, e.g., connecting electrical signals on a printed circuit board (PCB) or a schematic, or connect­ ing the electric power supply, water supply, or Internet cable between other point, like points drawn on a sheet of paper or the electric signal and power supply paths on a PCB. The latter case is in principle O(n^2) because for a set of n points, there are (n-1) other points

(Computer-Aided Design) program has a PCB (Printed Circuit Board) mode, in which the user can cre­ ate new PCB pads by entering the pad data in a text entry widget. A PCB pad is a rectangular-shaped copper all sorts of connection problems, e.g., connecting electrical signals on a printed circuit board (PCB) or a schematic, or connecting the electric power supply, water supply, or Internet cable between point, like points drawn on a sheet of paper or the electric signal and power sup­ ply paths on a PCB. The latter case is in principle O(n^2) because for a set of n points, there are (n-1) other points

(Computer-Aided Design) program has a PCB (Printed Circuit Board) mode, in which the user can create new PCB pads by entering the pad data in a text entry widget. A PCB pad is a rectangu­ lar-shaped copper all sorts of connection prob­ lems, e.g., connecting electrical signals on a printed circuit board (PCB) or a schematic, or connect­ ing the electric power supply, water supply, or Internet cable between other point, like points drawn on a sheet of paper or the electric signal and power supply paths on a PCB. The latter case is in principle O(n^2) because for a set of n points, there are (n-1) other points

(Computer-Aided Design) program has a PCB (Printed Circuit Board) mode, in which the user can cre­ ate new PCB pads by entering the pad data in a text entry widget. A PCB pad is a rectangular-shaped copper all sorts of connection problems, e.g., connecting electrical signals on a printed circuit board (PCB) or a schematic, or connecting the electric power supply, water supply, or Internet cable between point, like points drawn on a sheet of paper or the electric signal and power sup­ ply paths on a PCB. The latter case is in principle O(n^2) because for a set of n points, there are (n-1) other points