java code review checklist

Review in-depth understanding of Java object-oriented programming A class is an abstract concept in which an object is a concrete representation of a class and is a concrete concept. There is a class first, and then the object is generated by the class. The object is also called an instance (Instance). A class consists of two components: properties and methods. Attributes are generally represented by

call another constructor method of the same class. Such as:public class Circle { private Double radius; Public Circle (Double radius) { This.radius = radius; } Public Circle () {This (1.0); }}Java requires that in the constructor method, the statement this (the argument list) should appear before any other executable statement.If a class has multiple construction methods, it is best to implement them using this (parameter

directory (appended with the attached document):The red circle is the position I played on CMD;Here is the automatically generated file directory, and the file directory of the class file:There is also a red pen circle out;The following is a second file:Package Com.jaovo.webTeah;/** Here I wrote two source code, the last source file of the class file compiled into com.jaovo.webTeah.db this folder; * This is the second source

an abstract class and an interface?(1) Abstract classes need to be inherited, and can only be inherited. Interface needs to be implemented, and can be implemented more, that is, to implement multiple interfaces(2) Abstract classes can be defined abstract methods and non-abstract methods, subclass inheritance can directly invoke non-abstract methods, the interface can only define abstract methods (that is, all of the interfaces are not implemented methods), subclasses must implement their method

----Java SE Basics Review1. Break in a looping statement terminates all loops, jumps out of the loop body, and continue terminates the loop, jumping to the next loopThe 2.return statement has two functions: return value; End method Run3. For object-oriented understanding in Java: Organize the code as a class and encapsulate the data as an object. Classes are equi

What are the characteristics of Java?1. Simplicity2. Object-Oriented languages3. A platform-agnostic language (cross-platform)4. Robustness and security5. Multithreading6. Garbage collection mechanism2. What is a JDK? What is a JRE?The JDK is the Java Development toolset. (compilation environment, running environment, debugging environment, base Class library)The JRE is the operating environment of

Java review 001 Record my java review notes at will ArrayList memory extension methods: ArrayList, scatter list, and Vector. Differences between HashMap and HashTable For details about HashMap implementation, see vblog-HashMap Hashtable, which is similar to HashMap, but does not allow null keys and null values. I

Future interface, futuretask implementation in common thread pooling, etc. Internal details of the intern method of the 2.12 string, changes in jdk1.6 and jdk1.7, and implementation of the internal CPP code stringtable 1.3 Design Patterns Single-Case mode Factory mode Decorator mode Viewer design Pattern Threadlocal design mode 。。。 1.4 Regular Expressions 4.1 Capturing groups and non-capturing group

use +, followed by the Append method using StringBuffer or StringBuilder, as for the concat in the string class is seldom used.In general, if in a small number of strings splicing, we will use +, if the stitching too much, single-threaded use of StringBuilder, multi-threaded use stringbuffer splicing. Because the use of String + in the concatenation of too many strings will be a great use of memory, because it is by virtue of the use of the Append () method, and then the ToString conversion, if

synchronous method. When the Synchronized keyword modifies a piece of code, this code is called a synchronous block of code. 3) Each object in Java has a unique lock (lock or monitor), and when a thread accesses an object's synchronized method, it means that the object is locked, and no other thread can access the Syn

operation to see very easy to understand, I do not pull useless, just say a few slightly NOTE: * String connector "+": even if the value plus and operator, is also a string connector; * He will perform automatic data type conversions (Boolean does not participate in conversions) * The result of the operation is also a string type **//*Public class operator_05{public static void Main (string [] args) {//String connector System.out.println (" Pi= "+ 3.14); int a = 10; int B =

of encapsulation in Java? Please give an example.(1) Hide implementation Details and provide public access(2) Benefits:A: Hide implementation details and provide public accessB: Improve the reusability of codeC: Improve the security of your code(3) Design principlesHide the implementation details that you don't want to know about, and provide a common way to access them.(4) Private is a manifestation of en