java操作系统属性

Properties ps =System.getProperties();
  Enumeration pn = ps.propertyNames();
    
     while(pn.hasMoreElements()){
      String name = (String)pn.nextElement();
      String value =(String)ps.getProperty(name);
     
      System.out.println (name+"="+value);
     }
  
        System.setProperty("jmagick.systemclassloader","no");