好的，以下是为您整理的详细教程：
Java JDK 安装与环境配置教程（2025年最新版）
1. 下载 JDK
2. 安装 JDK
3. 配置环境变量
Windows 系统
- 右键点击 此电脑 → 属性 → 高级系统设置 → 环境变量。
- 点击 系统变量 下的 新建。
- 变量名：JAVA_HOME
- 变量值：JDK 安装路径（例如 C:\\Program Files\\Java\\jdk-21\\）。
- 选中 Path → 编辑 → 新建，添加两条路径：
- %JAVA_HOME%\\bin
- %JAVA_HOME%\\jre\\bin
Mac/Linux 系统
export PATH=$JAVA_HOME/bin:$PATH
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4. 验证安装
javac -version
Java(TM) SE Runtime Environment (build 21.0.3+15-LTS-…)
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常见问题解决
- 报错“不是内部命令”：检查 Path 是否包含 %JAVA_HOME%\\bin。
- 版本不一致：确保环境变量指向的路径与实际安装路径一致。
- 权限问题（Mac/Linux）：使用 sudo 编辑配置文件。
