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  The installation method provided in this article is applicable to jdk1 Users of version 8 (with the method and configuration of installing jdk1.8)   First of all, I need to explain Because jdk1 8 has javafx, so we don't need to download the plug-ins related to javafx, just install jdk1 8 is enough   1.jdk1.8 Download and configuration ...

New features of Java 8 -- lambda expression and Stream class 1, lambda expression Lambda expression itself is the implementation of an interface. Lambda expression is a new feature of JDK8. It can replace the anonymous inner class of the interface and write more elegant Java code (equivalent to syntax sugar). If you want to use lambda to simp ...

catalogue 2.2 variables and constants Example 2.1 declare a double constant, assign a value to the constant, and use the constant for calculation. 2.3 basic data type Example 2.2 assign values to int variables according to decimal, octal and hexadecimal Example 2.3 shows the error result of 4.35 * 100 and gives the solution. Example 2.4 c ...

catalogue 1, Concept of array (including some shortcut key usage) 2, Two dimensional array III. Arrays tools 4, Array exception 1, Concept of array (including some shortcut key usage) A collection of multiple data of the same type arranged in a certain order 1. Characteristics of array: 1) orderly arrangement 2) the array is a varia ...

Bitmap addition and subtraction multiplication and division Let's briefly explain what our bitmap is First of all, we can't avoid storing data in many cases during data processing. At this time, we will open up memory to create arrays to store our data But let's take shaping as an example. int takes up 4 bytes of space, Suppose I want t ...

preface This article is a reference from https://www.w3cschool.cn/struts_2/struts_tiles.html Make a practice log. jar package download address Please go to the website to download the relevant jar package and download an all version https://struts.apache.org/download.cgi Initialization project and jar package pull Here you need to unzi ...

catalogue 1. Seal  2. Take gold coins  3. Digital game 1. Seal Problem description There are n kinds of seals with the same probability of occurrence. Xiao A bought m seals and asked for the probability of collecting n seals. Input format Two positive integers n and m in a row Output format A real number P represent ...

Case description: Random Name Caller, that is, a classmate's name is printed out randomly in the whole class. To make a random roll caller, it has the following three contents: Store names of all students Print the name of the whole class Randomly name one of them and print to the console Case Study: Print out a student's name randomly in th ...

preface There is a lot of writing ahead, and there is no CTRL+Z Less nonsense, or put this "Hello World!" Finish it. Java's "Hello World!" As follows: class HelloWorldApp { public static void main(String[] args) { System.out.println("Hello World!"); // Display the string. } } This code is copied fr ...

10.1 File class java. io. An object of the file class that represents a file or file directory Constructor creates a File instance: File(String filePath)File(String parent, File child)File(File parent, String child) Path separator: windows and DOS systems use "\" by default UNIX and URL s are represented by "/&quo ...