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1, Basic use of arithmetic operators 1.+,-,*,/,%,++,– int num1 = 10; int num2 = 5; int result = num1 + num2; System.out.println(result);//15 System.out.println(num1 - num2);//5 System.out.println(10 * 5);//50 System.out.println(10 / 5);//2 System.out.println(10 % 3);//1 //++: self increment 1 //++a: Increase ...

The requirement is to add a picture verification code when sending SMS verification code. 1. Code implementation Tool class for generating verification code pictures -- verifyutils java package com.lmc.utils; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.LinearGradientPaint; import java.awt.P ...

1. Scene restore In the actual project, there are many needs to search or filter the required data by setting a specific time period. Today, the author gives a detailed explanation on the application method of greater than and less than signs involved in time comparison in mybatis. 2. Implementation plan Here are two possible methods: ① Esc ...

super keyword Basic introduction super represents the reference of the parent class and is used to access the properties, methods and constructors of the parent class. Basic grammar 1. Access the property of the parent class, but cannot access the private property of the parent class: super Attribute name; 2. Access the method of the paren ...

One of the technologies that some people haven't understood throughout their Python career: object orientation.Python object oriented programmingTo be exact, Python is also an object-oriented programming language, referred to as OOP. We already know that all data types in Python are objects. Except those set by python, python allows program dev ...

After the interactive interface design is completed, it will be followed by the writing of control functions and other functions, The first thing to do is to write the functions of each control of the calculator. These functions can be generated automatically by double clicking the control directly in Visual Studio. This is very convenient and ...

In order to enable developers to write SQL flexibly, Mybatis also spent a lot of effort, defining a lot of tags and syntax, which will be introduced one by one below. if Although the English is not very good, I don't know if it means in such a simple way. It also exists in Java syntax. Only when the judgment condition is true will the SQL s ...

Binary tree refers to an ordered tree in which the degree of nodes in the tree is no more than 2. It is the simplest and most important tree. The recursive definition of binary tree is: a binary tree is an empty tree, or a non empty tree composed of a root node and two disjoint left and right subtrees called roots respectively; the left and r ...

Data type explanation - List A list is a group of ordered data combinations, and the data in the list can be modified Definition of list You can define []You can also use the list function to defineWhen defining the elements in the list, you need to use commas to separate each element. [1,2,3,4]The elements in the list can be of any ...

Overview of Java Reflection Mechanism What is reflection: (1) The core of Java reflection mechanism is to dynamically load classes and obtain detailed information about them while the program is running, thereby manipulating the properties and methods of classes or objects. Essentially, after the JVM gets the class object, it decompiles it to ...