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));
        }
    }
}