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Tip: the following is the main content of this article. The following cases can be used for reference 1, Date class (time date class) 1. General Date represents a specific time, accurate to milliseconds 2. Construction method Method nameexplainpublic Date()Allocate a Date object and initialize it so that it represents the time it is ...

1. First, basic knowledge: Original link: https://blog.csdn.net/baidu_39298625/article/details/105842725 1: Introduction Excel processing is often designed in development, such as exporting excel and importing excel into database. At present, there are two frameworks for operating excel, one is apache poi and the other is Java Excel Introducti ...

1. Three ways to define arrays Array: a collection that stores a set of data of the same data type public class TestDemo { public static void main(String[] args) { int[] array = {1,2,3,4,5,6,7}; // Array defined and initialization [] cannot put any numbers // matters needing attention: // 1. When defining ...

The gateway is used to control the execution process (or the execution token described in BPMN 2.0). The gateway can consume or generate tokens. A gateway is graphically displayed as a diamond with an icon inside. This icon displays the type of gateway. 1. Exclusive gateway describe Exclusive gateways (also known as XOR gateways or more sp ...

Non intrusive: many classes have been written in the system, and now a new technical framework can be used. While using the new framework, the original class does not need to be changed (there is no need to inherit and implement the interface in the new framework). Framework: Spring, Hibernate, Mybatis Intrusive: many classes have been wri ...

home pagespecial columnjavaArticle details0[data structure and algorithm] - linked listbenntty74 Published 13 minutes ago1. What is a linked listLinked list is a kind of linear list. Linear table means literally that the relationship between data is connected by a line.Linear tables are divided into address space continuous and address space di ...

JDBC and DBUtils tools What is JDBC? In Web development, it is inevitable to use database to store and manage data. In order to provide support for database access in Java language, SUN company provided a set of standard Java class library for database access, namely JDBC, in 1996 The full name of JDBC is Java Database Connectivity, which is ...

preface         hello everyone! Today is Day03. Nice to meet you again I wonder if you have ever encountered such a situation. When we need to calculate a large amount of data, it will always be very troublesome and cumbersome, especially the calculation of data related addition, subtraction, multiplication and divisi ...

The previous BlockingQueue is a one-way FIFO queue, while LinkedBlockingDeque is a two-way blocking queue composed of linked lists. A two-way queue means that elements can be inserted and removed from both ends of the header and tail. It also means that LinkedBlockingDeque supports FIFO and FILO operations. LinkedBlockingDeque is an optional c ...

1. Basic concepts: program, process and thread A program is a set of instructions written in a certain language to complete a specific task. It refers to a piece of static code, static object. A process is an execution process of a program, or a running program. It is a dynamic process: it has its own process of emergence, existence and extin ...