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Java应用程序通常被编译成字节码，可以在任何Java虚拟机（JVM）上运行，而不考虑底层计算机架构。Java的语法与C和C++相似，但比它们的低级设施少。Java运行时提供动态功能（如反射和运行时代码修改），这些功能通常在传统的编译语言中是不存在的。截至2019年，根据GitHub的数据，Java是最受欢迎的编程语言之一，特别是在客户端-服务器网络应用方面，据说有900万开发人员。。

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There are two distinct types of multitasking: process-based and thread-based. It is important to understand the difference between the two. A process is, in essence, a program that is executing. Thus, process-based multitasking is the feature that allows your computer to run two or more programs concurrently. For example, it is process-based multitasking that allows you to run the Java compiler at the same time you are using a text editor or browsing the Internet. In processbased multitasking, a program is the smallest unit of code that can be dispatched by the scheduler.
In a thread-based multitasking environment, the thread is the smallest unit of dispatchable code. This means that a single program can perform two or more tasks at once. For instance, a text editor can be formatting text at the same time that it is printing, as long as these two actions are being performed by two separate threads. Although Java programs make use of process-based multitasking environments, process-based multitasking is not under the control of Java. Multithreaded multitasking is.

A principal advantage of multithreading is that it enables you to write very efficient programs because it lets you utilize the idle time that is present in most programs. As you probably know,most $\mathrm{I} / \mathrm{O}$ devices, whether they be network ports, disk drives, or the keyboard, are much slower than the CPU. Thus, a program will often spend a majority of its execution time waiting to send or receive information to or from a device. By using multithreading, your program can execute another task during this idle time. For example, while one part of your program is sending a file over the Internet, another part can be reading keyboard input, and still another can be buffering the next block of data to send.

You create a thread by instantiating an object of type Thread. The Thread class encapsulates an object that is runnable. As mentioned, Java defines two ways in which you can create a runnable object:
You can implement the Runnable interface.
You can extend the Thread class.
Most of the examples in this chapter will use the approach that implements Runnable. However, Try This 11-1 shows how to implement a thread by extending Thread. Remember: Both approaches still use the Thread class to instantiate, access, and control the thread. The only difference is how a thread-enabled class is created.

The Runnable interface abstracts a unit of executable code. You can construct a thread on any object that implements the Runnable interface. Runnable defines only one method called $\operatorname{run}()$, which is declared like this:
public void run( )
Inside run( ), you will define the code that constitutes the new thread. It is important to understand that run( ) can call other methods, use other classes, and declare variables just like the main thread. The only difference is that run( ) establishes the entry point for another, concurrent thread of execution within your program. This thread will end when run( ) returns.

计算机代写|Java代写|Determining When a Thread Ends

It is often useful to know when a thread has ended. For example, in the preceding examples, for the sake of illustration it was helpful to keep the main thread alive until the other threads ended. In those examples, this was accomplished by having the main thread sleep longer than the child threads that it spawned. This is, of course, hardly a satisfactory or generalizable solution!

Java代写

Runnable 接口抽象了一个可执行代码单元。您可以在任何实现 Runnable 接口的对象上构造线程。Runnable 只定义了一种方法，称为跑⁡()，声明如下：
public void run

Matlab代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。