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preface Collection source code analysis series: Java collection source code analysis The vector, ArrayList and LinkedList have been analyzed. I wanted to start Map, but I looked at the following interface design framework diagram: the whole interface framework relationship is as follows (from Baidu Encyclopedia): It turns out that there is ...

catalogue Combination of classes Concept of combination Constructor design of class composition Initialization order when constructing composite class objects Class assembler example Example 4-4: combination of Line class and Line class Forward reference declaration Forward reference declaration considerations Combination of classes ...

String class and StringBuffer class Initialization of String class Directly initialize a String object with a String constant String variable name = string; When initializing a string constant object, you can either set the initial value of the string object to null or initialize it to a specific string String str1 = null; //Ini ...

Java has introduced four references since version 1.2, and the four references range from high to low: Strong Reference>Soft Reference>Weak Reference>Virtual Reference 1. Strong References (Never Recycle) If an object has a strong reference, the garbage collector will never recycle it. When there is insufficient memory space, th ...

This article mainly introduces the detailed explanation of Python function definition and parameter transmission methods (4 kinds). The example code in this article is very detailed, which has certain reference and learning value for everyone's study or work. Friends in need, let's learn together with Xiaobian 1, Elementary knowledge of functi ...

Semaphores, in other words, control the number of concurrent threads, which is the number of concurrent threads in turn See the example: import threading # Import module import time # Import module class Exam(threading.Thread): # Create class def __init__(self, num): # initialization super(Exam, self).__init__() # Parent cl ...

Flash get post request parameters Today, let's continue to talk about how to obtain post request parameters using flash web application. summary There are several ways for post requests. The content type entity header is used to indicate the MIME type of the resource media type . Content type is the field of http request header. As a r ...

The content of this article comes from learning MIT open course: univariate calculus - correlation rate - Netease open course 1, Examples of best value problems 1. Cut a line with a length of 1 into 2 segments, circle each segment into a square, and find the maximum area that can be obtained , Calculate both ends: Therefore, when t ...

1. String class: 1) String/StringBuffer/StringBuilder are three classes that represent strings. 2) String: immutable String. The bottom layer is implemented with char [] decorated with final, and the length cannot be changed. 3) all methods of StringBuffer are decorated with synchronized, so it is thread safe, and StringBuffer is non thread sa ...

preface stay java Concurrent Programming (16) -- seven categories and characteristics of locks In this paper, we classify locks into various dimensions, one of which is fair / unfair. In this paper, we discuss fair and unfair locks. Fair | unfair First, let's look at what are fair locks and unfair locks. Fair locks refer to allocating locks ...