Person p=new Person("xiao ming ",18);
Class cla=p.getClass();
for(Field f:cla.getDeclaredFields()){
System.out.println("-----------------");
System.out.println(f.isAccessible());
f.setAccessible(true);
System.out.println(f.isAccessible());
System.out.println(f.getName()+":"+f.get(p));