在Jenkins中，如果要设置环境变量并在Java代码中访问它，可以使用以下步骤:

In Jenkins if you want to set an environment variable and access it in your java code you can use below steps :

1. 在管理Jenkins"页面的配置系统"菜单中的Jenkins中创建环境变量.例如，您添加了一个名为浏览器"的环境变量.

2. 您可以使用以下代码在java程序中访问相同的环境变量.

1. Create an environment variable in Jenkins in Configure system menu in Manage Jenkins page. For example, you have added an environment variable named 'Browser'.

2. You can access the same environment variable in java program using below code.

System.out.println(System.getenv("Browser"));