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初识java

JDK安装​

JDK8官网
https://www.oracle.com/java/technologies/downloads/#java8-windows
JDK历史版本列表
https://www.oracle.com/java/technologies/downloads/archive/
JDK8202及之前历史版本
https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html
华为jdk8镜像
https://repo.huaweicloud.com/java/jdk/8u202-b08/

下载jdk-8u202-windows-x64.exe

环境变量配置

JAVA_HOME=C:\Program Files\Java\jdk1.8.0_202

PATH添加 %JAVA_HOME%\bin

环境变量验证

java -version

javac -version

其他版本jdk下载(按需下载)​

8u422 adoptium 版 https://github.com/adoptium/temurin8-binaries/releases/download/jdk8u422-b05/OpenJDK8U-jdk_x64_windows_hotspot_8u422b05.msi
17.0.12 adoptium 版 https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.12%2B7/OpenJDK17U-jdk_x64_windows_hotspot_17.0.12_7.msi

IDEA安装​

下载IDEA
下载地址：https://www.jetbrains.com/idea/download/

IDEA历史版本
https://www.jetbrains.com/idea/download/other.html
建议下载2023.2.5保持环境一致

安装后需要激活

解压 激活码-Win系统.zip 到某个盘根目录

双击IDEA激活.vbs 激活

第一个程序helloword​

按照博客https://blog.csdn.net/gsls200808/article/details/128915090

创建第一个项目

目前2024版创建的demo项目源码如下 

public class Main {
    public static void main(String[] args) {
        System.out.printf("Hello and welcome!");

        for (int i = 1; i <= 5; i++) {
            System.out.println("i = " + i);
        }
    }
}

页面输出为

Hello and welcome!i = 1
i = 2
i = 3
i = 4
i = 5