Sword finger offer: stack push-in, pop-up sequence (Java)

1. Topic Description Enter two integer sequences. The first sequence represents the stack's pressing order. Please determine whether the second sequence is likely to be the stack's pop-up order. Assume that all the numbers pushed into the stack are unequal. For example, sequence 1, 2, 3, 4, 5 is the input sequence of a stack, sequence 4, 5, 3, ...

Posted on Mon, 14 Oct 2019 08:07:21 -0700 by stargate03

Object Flow Implementing Order Processing

Use object flow to achieve the following effects: Demand: When shopping online, a user fills in an order, the content of which is a list of products, which is stored in the "order.bin" file. Runtime If the "order.bin" file does not exist, enter a new order If it exists, display an ...

Posted on Mon, 14 Oct 2019 08:01:46 -0700 by El Ornitorrico

Current Limiting Technology for High Concurrent Solution--Leaky Bucket Current Limiting

1. Leaky bucket algorithmLeaky Bucket Algorithms as a Meter can be used for Traffic Shaping and Traffic Policing. Leaky Bucket Algorithms are described as follows:A leaky bucket with a fixed capacity flows water droplets at a constant fixed rate.If the bucket is empty, there is no need to flow out water drops;Water droplets can flow into the le ...

Posted on Mon, 14 Oct 2019 08:00:15 -0700 by fuii_koh

Java Object-Oriented Polymorphism

Polymorphism in Java: 1. Overloading and rewriting of methods; 2. Use the reference of the parent class to point to the concrete implementation of the subclass, and can be replaced by the concrete implementation of other subclasses at any time. First, build a parent Animal: public class Animal { public ...

Posted on Mon, 14 Oct 2019 07:42:33 -0700 by potato

Inheritance of subclasses

First: Inheritance of child and parent classes in the same package People.java package JiCheng; public class People { int age,leg=2,hand=2; protected void showPeopleMess() { System.out.printf("%d Year old%d Only feet,%d singlehandedly\t",age,leg,hand); } } Student.java package JiCheng; public class Stude ...

Posted on Mon, 14 Oct 2019 07:08:01 -0700 by firedrop84

2. Sharing among threads

Sharing between threads Synchronization object lock and class lock Synchronization is a synchronization lock for multithreaded keywords. It can modify the following objects: Code Block: The modified code block is called Synchronized Code Block. The scope of the function is the code in {} and the object of the function is the object that calls t ...

Posted on Mon, 14 Oct 2019 06:42:03 -0700 by jackthebookie

Spring Cloud Feign summarizes problems, points of attention, performance tuning, switching okhttp3

Summary of Feign Frequent Questions If FeignClient interface uses @ PathVariable, value attribute must be specified //In some early versions, @PathVariable("id") has the "id", which is the value attribute, which must be specified and cannot be omitted. @FeignClient("microservice-provider-user") public interface UserFeignClie ...

Posted on Mon, 14 Oct 2019 06:15:33 -0700 by screamer141

RocketMQ Master-Slave Synchronization Source Code Analysis

Wechat Public Number "Back-end Advancement" focuses on back-end technology sharing: Java, Golang, WEB framework, distributed middleware, service governance and so on. A previous article on the difference between RocketMQ queues and Kafka partitioned replicas mentioned that RocketMQ message redundancy is mainly achieved through master- ...

Posted on Mon, 14 Oct 2019 05:11:02 -0700 by brewmiser

java Foundation (32): Class Loading, Reflection

1. Class loader 1.1 Class loading When a program wants to use a class, if the class has not been loaded into memory, the system will initialize the class by loading, connecting and initializing three steps. Load It means to read the class file into memory and create a Class object for it. The system creates a Class object when any class ...

Posted on Mon, 14 Oct 2019 04:41:14 -0700 by aurigus

Express Logistics Single Number Information Inquiry Call Express Bird API

E-commerce platforms and small programs have logistics modules, which need to inquire about the status of logistics trajectories. It is very troublesome for every family to dock with Shunfeng, Shentong, Zhongtong, Yuantong, Yunda, Baishi, Post, EMS, Jingdong, Tiantian, Debang, Aneng and other express single inquiry interfaces and electronic one ...

Posted on Mon, 14 Oct 2019 00:21:05 -0700 by herreram