Programmer Group

catalogue 1. while loop 2. do while loop 3. for loop 4. Practice 5. Knowledge points: ternary operator, ternary operator 1. while loop While (condition){           Code to be executed when the condition is true;           Make the condition close to false operation; } Logic: w ...

Observer design pattern is useful when you are interested in the state of an object and want to get notified whenever there is any change. Use observer mode when you want to be notified of any changes in the state of an object. Observer design pattern is also called as publish-subscribe pattern. The observer design pattern is also known as the ...

This article is excerpted from "design patterns should be learned this way" 1. Scenario of KPI assessment using visitor mode At the end of each year, the management will begin to evaluate the work performance of employees for one year. Employees are divided into engineers and managers; The management includes CEO and CTO. CTO pays at ...

introduction Flink provides a special Kafka connector to read or write data to Kafka topic. Flink Kafka Consumer integrates Flink's Checkpoint mechanism to provide exactly once processing semantics. For this reason, Flink does not completely rely on tracking the offset of Kafka consumption group, but tracks and checks the offset internally. W ...

🏇 wood wood have word say : \textcolor{Orange} {Mu has something to say:} ...

Huawei 04.16 reply to three algorithm questions 1. Invert the substring between each pair of parentheses Give a string s (containing only lowercase letters and parentheses). Please reverse each pair of matching strings in parentheses layer by layer from inside to outside of parentheses, and return the final result. Note that your results sh ...

In this article, we will learn the URLDNS chain of ysoserial tool. Compared with the CC chain learned earlier, the URLDNS chain is relatively simple. URLDNS is a utilization chain used by ysoserial tool to detect the existence of Java deserialization vulnerability. Through URLDNS utilization chain, you can initiate a DNS query request, so as ...

Hello, everyone. I'm a student in the java learning circle who doesn't want to disclose my name and lives a shoddy life. If there are mistakes in the article, I hope Haihan. You're welcome to make more corrections If you get useful dry goods knowledge from this article, please give me a favor. It is said that all the likes have got offer s ...

Local and global references in JNI In the previous article, I introduced creating object arrays in JNI. This article is the eleventh in the JNI series. It introduces how to call Java methods and static methods in Native code in JNI. The outline of the series is as follows: Introduction to JNIJNI basic typeJNI StringJNI arrayJNI instance vari ...

Example 1: Yue Xiaopeng took the Java exam. He and his father Yue buqun made a commitment: If the score is 100, a BMW will be rewarded; When the score is (80, 99], an apple will be rewarded; When the score is [60,80], reward a watch; Other times, there is no reward. Please input Yue Xiaopeng's final grade from the keyboard and judge it package ...