Java
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+ + and in Java–
Difference between I + +, I -- and + + I, -- I: I + +, I -- assignment before operation; @H_ 502_ 17@++i , -- I is cal…… -
Final keyword of Java
When declaring classes, attributes and methods in Java, you can use the keyword final to modify them, indicating "fina…… -
Thread of Java (thread creation method, thread class in Java, thread synchronization, thread life cycle, communication between threads)
CPU: 10 core, main frequency 100MHz 1 core dominant frequency 3GHz So which CPU is better? Isn't the more CPU cores th…… -
JavaBean of Java
JavaBean is a reusable component written in Java language. JavaBeans refer to Java classes that meet the following sta…… -
Polymorphism of Java
Polymorphism: the most important concept in object-oriented, which is embodied in Java in two ways: Member variable ca…… -
Logical operators of Java
&-Logic and | - logic or- Logic non &&- short circuit and | - short circuit or ^ - logic XOR Points needin…… -
Program flow control of Java
Sequential structure: the code is executed from top to bottom; Branch structure: if () { } else{ } if () { } else if (…… -
Object class of Java
Object is the parent class of all classes, also known as the base class. If you do not use the extends declaration in …… -
Java (I) basic knowledge
Common DOS commands: History of computer language: Javase: Java Standard Edition, which provides a complete Java core …… -
Ternary operator of Java
Logical operation? m : n; If the logical operation is true, M is returned; otherwise, n is returned example: Judge the…… -
Subclass object instantiation process of Java
Suppose there is a parent class: There is a subclass: Student stu = new student(); The process is as follows: -
Collection, a tool class of Java operation collection
Collections is a tool class that operates on collections such as set, list, and map. Collections provides a large numb…… -
Bit operator of Java
Integer to binary: integer toBInaryString(6) < <: move left, 3 < < 2 = 3 * 2 * 2 = 12 >>: shift righ…… -
Java of Java io. File related methods
java. io. Use of file. IO principle and stream classification. File stream: FileInputStream, fileoutputstream, FileRea…… -
Variable number formal parameters of Java
//Use array parameters to define methods public static void test (int a,String[] books); //A variable number of formal…… -
Object type conversion of Java
Conversion between basic data types: public class Person extends Object{} public class Student extends Person{} Cast J…… -
Priority of Java operators
The priority decreases from top to bottom, that is, the priority of the previous line is always greater than that of t…… -
Static keyword of Java
Design idea of class attribute and class method: Scope of use: in Java classes, static can be used to modify attribute…… -
Ternary operator of Java
Logical operation? m : n; If the logical operation is true, M is returned; otherwise, n is returned example: Judge the…… -
Java = = operator and equals operator
==Operator: Equals operator: Output: false false Output: true true Output: true true true false Note: A1 and B1 point …… -
How to automatically complete new objects in eclipse
For example, we are entering: Then press Ctrl + 1, Select the first item: -
Collection of Java (set, list, map)
The Java collection class is stored in the Java, UTI package and is a container for storing objects. Java collections …… -
Java interface
Sometimes you must derive a subclass from several classes and inherit all their properties and methods. However, Java …… -
Java (III) conversion between basic types
Automatic type conversion: types with small capacity are automatically converted into data types with large capacity. …… -
Java simple class object instantiation process
Suppose there is such a class: Person p = new Person(); The creation process of the whole object is as follows: -
Parameter passing of Java methods (value passing and reference passing)
Method is meaningful only when it is called by its class or object. If the method has parameters: Formal parameter: pa…… -
Examples of different data flow applications of Java
It is divided into byte stream (8bit) (InputStream and ouputstream) and character stream (16bit) (reader and writer) a…… -
Enumeration and annotation of Java
JDK1. 5. The newly added enum keyword is used to define enumeration classes. Differences between enumeration class and…… -
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Abstract class of Java
With the definition of new subclasses in the inheritance hierarchy, the class becomes more and more specific, while th…… -
A brief introduction to cookies
reflection: HTTP is a stateless protocol. When a client sends a request to the server, the connection is closed after …… -
lambda expressions
Properties of lambda expressions: Lambda expression can be understood as a way to concisely represent a transitive ano……