Three ways of reflection

public class ReflectionDemo {
    public static void main(String[] args) {
       Class <?> cls = String.class; // It is only suitable for those that have been specified to operate before compilation Class
       try{ // The full pathname of the class has been specified
             Class <?> c= Class.forName("java.lang.String"); 
          String s=(String)c.newInstance();
       }catch(Exception e){
             System.out.println(e.getMessage());
       }
       //3、 Suitable for cases with object examples
       String str = new String();
       System.out.println(str.getClass());
    }
}