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Fibonacci sequence: The most well-known approach is memoization. Advantage is fast, but space complexity is big. O(N). Bottom-up: 1 : Bottom-up dynami 阅读全文
posted @ 2021-01-18 03:35
Zhentiw
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Why need to use @ResponseEntity, first let's see what problem we might have when we don't use it. @RestController public class ProductsRestController 阅读全文
posted @ 2021-01-15 21:38
Zhentiw
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Interceptor jump in before controller. So request may not reach controller if Pre-process is not ok. Demo: package com.test.hplus.interceptors; import 阅读全文
posted @ 2021-01-15 19:56
Zhentiw
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In this lesson, you will learn how to extend a class's functionality through typescript decorators. Decorators provide a way to add both annotations a 阅读全文
posted @ 2021-01-14 04:21
Zhentiw
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@ControllerAdvice public class DefaultAttributeController { // apply default value @ModelAttribute("newuser") public User getDefaultUser() { return ne 阅读全文
posted @ 2021-01-13 19:40
Zhentiw
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Create file: // this apply to all the controllers @ControllerAdvice public class ApplicationExceptionHandler { @ExceptionHandler(ApplicationException. 阅读全文
posted @ 2021-01-13 19:36
Zhentiw
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Controller: @Controller public class LoginController { private UserRepository userRepository; @PostMapping("/login") public String login(@ModelAttribu 阅读全文
posted @ 2021-01-13 01:18
Zhentiw
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If you need to convert a deep nested object struture, you cannot just use @InitBinder, you need to build a custom convertor: Exp: conver city prop in 阅读全文
posted @ 2021-01-13 00:54
Zhentiw
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For example, from the client, it send date as string to BE. But BE requires date to be a Date instead of String. Controller: .. @Autowired private Use 阅读全文
posted @ 2021-01-13 00:39
Zhentiw
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User entity: import javax.validation.constraints.*; @Entity public class User { @Id private int id; @Size(min = 6, message = "Username cannot be less 阅读全文
posted @ 2021-01-12 20:54
Zhentiw
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