java 8 multithreading interview questions

In Java, the string "ABCD" is the same length as the string "ab Hello", and is four characters.But the corresponding number of bytes is different, one Chinese character occupies two bytes.Defines a method that takes a substring by the specified number of bytes.For example: for "ab Hello", if take three bytes, then the substring is AB and "You" word half, then half will abandon. If you take four bytes is "ab You", take Five bytes or "Ab you." The above

difference between the 5.sendRedirect () and Forward () methods?The Sendredirect () method creates a new request, and the forward () method simply forwards the request to a new target. After redirection (redirect), objects that were within the scope of the previous request are invalidated because a new request is generated, and after forwarding (forwarding), objects within the scope range of the previous request can be accessed. Sendredirect () is generally considered to be slower than forward

. 64. What are the similarities and differences between JSP and Servlet, and what are their relationships? JSP is an extension of Servlet technology. It is essentially a simple Servlet method, with more emphasis on the external expression of the application. After JSP compilation, it is "servlet-like ". The main difference between Servlet and JSP is that the application logic of Servlet is in the Java file and is completely separated from the HTML in

-point number;The default type of floating-point number is double type;A double type cannot also represent an exact value, such as a currency;The default value is 0.0d;Example: Double D1 = 123.4. BooleanThe Boolean data type represents one bit of information;Only two values: true and false;This type is only used as a sign to record the true/false situation;The default value is false;Example: Boolean one = True. CharThe char type is a single 16-bit Unicode character;Unicode is a fully interna

verification) We understand the role of this module as a facet, telling us that it is a functional module. We can think of it as a facet. To put it bluntly, we write a class. Write a method in this class that deals with the same effect in the core business.We also need to know two keyword:　connection point (Joinpoint), a simple understanding is the method defined in the tangent module. Is the method in the definition class above.　pointcut (Pointcut). Is the collection of connection points, whic