黑马程序员-JAVA高级视频_IO输入与输出-18天-1(System)

package itcast.java16; import java.util.Properties; /* * 获取系统一些特有信息 */ public class SystemDemo1 { public static void main(String[] args) { Properties properties = System.getProperties(); for (Object o : properties.keySet()) { System.out.println("key:" + o + ",value:" + properties.get(o)); } } }