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   we all know that ArrayList is non thread safe. When multithreading development, if multiple threads operate on the same ArrayList, a ConcurrentModificationException error will be reported. At this time, we need a thread safe List set.   I encountered such problems in the development process. A thread safe List collection is re ...

❤ Write in front ❤ Blog home page: Hard working Naruto ❤ Series column: JavaSE super detailed summary 😋 ❤ Welcome, friends, praise 👍 follow 🔎 Collection 🍔 Learning together! ❤ If there are mistakes, please correct them! 🌹 about [Chapter 10 Java collection] several brain maps take you into the brainstorming of Java collection 🔥 Extended ...

1 Map interface 1.1 general Java.util interface map < K, V > Type parameter: K - indicates the key maintained by this mapping; V - indicates the corresponding value maintained by this mapping Also called hash table, hash table It is often used for data of key value pair structure The key cannot be repeated and the value can be repea ...

Catalog Packaging Class Packing, Unpacking Comparison of packing List interface ArrayList Collection Traversal of Collection Collections Iterator Traversal Collection Delete exception for iterator ConcurrentModificationException exception for ArrayList collection The cause of the anomaly Single-threaded solution--method to call itera ...

Day2 Topic 4 Write a program to accept a series of comma separated numbers from the console and generate a list and a tuple containing each number. Suppose the following inputs are provided to the program: 34,67,55,33,12,98 The output should be: ['34', '67', '55', '33', '12', '98'] ('34', '67', '55', '33', '12', '98') code implementation ls ...

1. Mathematical operation function Introduction to built-in functions: Built in functions, which are built-in functions after Python installation All built-in function usage websites officially provided by Python: https://docs.python.org/zh-cn/3/library/functions.html Common mathematical operation functions: 1.abs() - find the absolute ...

preface The basis for using Lambda is that there must be a corresponding function interface (function interface refers to the interface with only one abstract method inside). This is consistent with the fact that Java is a strongly typed language, which means that you can't write Lambda expressions arbitrarily anywhere in the code. In fact, th ...

List introduction Each string in the List in Redis becomes an element. A List can store up to 2 ^ 32 - 1 elements. In Redis, you can insert (LPUSH) and pop-up (LPOP) at both ends of the list. You can also get the list of elements in the specified range and the elements of the specified index subscript. List is a flexible data structure, wh ...

Python sequence (list and tuple) usage complete introduction The so-called sequence refers to a sequence containing multiple data data structure , the sequence contains multiple data items (also known as members) arranged in order, and the members can be accessed through the index. Common sequence types in Python include strings, lists, and tu ...

Writing Python scripts to solve various small problems is one of my daily pleasures. I always like to find the python answer to a problem, and I also like to quickly find some great solutions in stack overflow when I don't know the solution. In this article, I will share nine Python scripts that are often used in daily work. 1. Use the defaul ...