dreaife的休憩小栈

This article mainly discusses core Java topics including the basic concepts of object-oriented programming, class definition and usage, operations on predefined classes such as LocalDate, construction and encapsulation of custom classes, static methods and fields, package management, creation and use of JAR files, and techniques for writing documentation comments. It emphasizes important design practices such as data encapsulation, initialization, and class design principles.

High-precision arithmetic includes addition, subtraction, multiplication, and division for large numbers that exceed the range of ordinary data types. Addition and subtraction are implemented by simulating manual calculation, while multiplication and division process digits step by step and pay attention to removing leading zeros. Related examples and reference code are provided to help understand and implement these operations.

This article mainly introduces core Java topics including an overview of Java, environment setup, basic program structure, data types, variables, operators, string processing, input and output, flow control, and array usage. It emphasizes Java simplicity, object-oriented features, and cross-platform capabilities, and also lists key terms such as JDK and JRE with detailed explanations.

This article introduces the principles and implementations of quicksort and merge sort, including time complexity and related problems. Quicksort partitions the sequence into two parts around a midpoint, while merge sort merges sorted subarrays. It also discusses binary search algorithms for integers and floating-point numbers and their implementations.

To upload large files to GitHub, you need to install Git Large File Storage (LFS) and configure it in the local Git repository. The process includes installing LFS, setting up pointers to track large files, and uploading the files with the corresponding commands. After completing these steps, large files can be uploaded to GitHub successfully.

Set up an online compiler by installing Docker and code-server. The process includes installing Docker, configuring an Alibaba Cloud mirror, running Nginx, installing and configuring code-server, and setting up a C/C++ build environment, then successfully running test code.

This experiment aims to understand the DNS protocol and its basic concepts, including domain name structure, DNS servers, and the principles of domain name resolution. It covers DNS system configuration, DNS information measurement with the dig tool, and DNS query packet analysis using tcpdump and Wireshark. The results show the fields in DNS queries and their meanings, and the experiment concludes with issues encountered and solutions, improving understanding of DNS and programming skills.

This experiment aims to understand the basic structure of email systems and communication protocols including SMTP and POP3. By sending and receiving emails using mail agents, clients, webmail, and telnet commands, the communication process and protocols are analyzed. The results show a clearer understanding of the detailed mail sending workflow and SMTP protocol analysis, improving programming ability and protocol understanding.