// 自带的
System.out.println("java版本号:" + System.getProperty("java.version"));
System.out.println("Java提供商名称:" + System.getProperty("java.vendor"));
System.out.println("Java提供商网站:" + System.getProperty("java.vendor.url"));
System.out.println("jre目录:" + System.getProperty("java.home"));
System.out.println("Java虚拟机规范版本号:" + System.getProperty("java.vm.specification.version"));
System.out.println("Java虚拟机规范提供商:" + System.getProperty("java.vm.specification.vendor"));
System.out.println("Java虚拟机规范名称:" + System.getProperty("java.vm.specification.name"));
System.out.println("Java虚拟机版本号:" + System.getProperty("java.vm.version"));
System.out.println("Java虚拟机提供商:" + System.getProperty("java.vm.vendor"));
System.out.println("Java虚拟机名称:" + System.getProperty("java.vm.name"));
System.out.println("Java规范版本号:" + System.getProperty("java.specification.version"));
System.out.println("Java规范提供商:" + System.getProperty("java.specification.vendor"));
System.out.println("Java规范名称:" + System.getProperty("java.specification.name"));
System.out.println("Java类版本号:" + System.getProperty("java.class.version"));
System.out.println("Java类路径:" + System.getProperty("java.class.path"));
System.out.println("Java lib路径:" + System.getProperty("java.library.path"));
System.out.println("Java输入输出临时路径:" + System.getProperty("java.io.tmpdir"));
System.out.println("Java编译器:" + System.getProperty("java.compiler"));
System.out.println("Java执行路径:" + System.getProperty("java.ext.dirs"));
System.out.println("操作系统名称:" + System.getProperty("os.name"));
System.out.println("操作系统的架构:" + System.getProperty("os.arch"));
System.out.println("操作系统版本号:" + System.getProperty("os.version"));
System.out.println("文件分隔符:" + System.getProperty("file.separator"));
System.out.println("路径分隔符:" + System.getProperty("path.separator"));
System.out.println("直线分隔符:" + System.getProperty("line.separator"));
System.out.println("操作系统用户名:" + System.getProperty("user.name"));
System.out.println("操作系统用户的主目录:" + System.getProperty("user.home"));
System.out.println("当前程序所在目录:" + System.getProperty("user.dir"));
// 自定义:setProperty(String key, String value)
System.setProperty("myDataKey", "myDataValue");
String value = System.getProperty("myDataKey");