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Use java to input a Yang Hui triangle with a specified number of rows

Yang Hui's triangle is arranged by numbers. It can be regarded as a number table. Its basic characteristic is that the values on both sides are 1, and the values in other positions are the sum of the values in the upper left corner and the upper right corner. When printing Yang Hui's triangle, you need to use a for loop statement.

Aug 29, 2020 pm 03:56 PM

java 杨辉三角

Introduction to the construction method and common functions of the File class

The construction method of File class: [File(String pathname)] gets the File object based on a path. [File(String parent, String child)] Get a File object based on a directory and a subfile/directory.

Aug 28, 2020 pm 03:36 PM

File 构造方法常用功能

Using java to implement a tool to convert images to PDF files

Java introductory tutorial: This article shares the code for converting images to PDF files. It has certain reference value and I hope it can help everyone.

Aug 27, 2020 pm 04:05 PM

java 图片 PDF

What is the usage of super keyword in java

The super keyword has three uses: 1. Access the overridden method in the parent class method; 2. Call the parent class constructor method; 3. Access the hidden member variables in the parent class.

Aug 26, 2020 pm 03:26 PM

java super

Java implements Chinese Valentine's Day confession artifact

This article shares with you a Chinese Valentine's Day confession tool, hoping it can help students in need.

Aug 25, 2020 pm 04:20 PM

java 七夕表白

Detailed example of contains method in ArrayList

The contains method in ArrayList is used to determine whether the target element is included in the ArrayList. Its principle is to call the indexOf(Object o) method.

Aug 24, 2020 pm 03:57 PM

ArrayList contains

What is the difference between next() and nextLine() in java?

The next() method will not obtain the spaces and tabs before and after the characters, but only obtains the characters until the space, tab key or enter key is encountered; the nextLine() method will obtain the spaces and tab keys before and after the characters until the return key is encountered. The car key ends.

Aug 21, 2020 pm 04:28 PM

java next() nextLine() 区别

What is the difference between collections and arrays in java

Java introductory tutorial: Arrays are of fixed length, and collections are of variable length; the elements stored in arrays must be of the same data type, and the objects stored in collections can be of different data types.

Aug 20, 2020 pm 05:08 PM

java 集合数组

Do you know what Spring is?

Spring is an open source lightweight Java development framework with two cores: Inversion of Control (IoC) and Aspect Orientation (AOP). The Java Spring framework flexibly manages transactions in a declarative manner, improving development efficiency and quality.

Aug 20, 2020 pm 04:19 PM

Spring

Three major functions of the static keyword

The three major functions of the static keyword: 1. static static member variables; 2. static static member methods; 3. static static code blocks.

Aug 19, 2020 pm 05:07 PM

static 关键字

Implementation of Hill sorting algorithm

Hill sorting is an improved version of direct insertion sorting. The improvement is to set a step size for each traversal and then perform direct insertion sorting. After completing a traversal, the step size is halved until the step size is less than or equal to 1.

Aug 17, 2020 pm 04:31 PM

希尔排序

A brief overview of java multithreading

Java introductory tutorial: This article briefly introduces the relevant knowledge of Java multi-threading. It has certain reference value and I hope it can help everyone. A process is an independent unit of the system that allocates and calls resources. Each process has its own memory space and system resources.

Aug 15, 2020 pm 04:26 PM

java 多线程

Overview of Collection interface and Map interface

Java collections are mainly composed of two major systems: Collection system and Map system. Among them, the Collection system and the Map system are the top-level interfaces in the two systems respectively. Collection mainly has three sub-interfaces: List, Set, and Queue.

Aug 14, 2020 pm 04:54 PM

Collection Map 接口

What are the similarities and differences between abstract classes and interfaces?

Abstract classes can contain both abstract methods and non-abstract ordinary methods, while methods in interfaces must be abstract methods; abstract classes can have constructors, but interfaces cannot have constructors.

Aug 13, 2020 pm 04:51 PM

抽象类接口