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First knowledge of Java -- (Java study note 1), first knowledge of java Study Notes

First knowledge of Java -- (Java study note 1), first knowledge of java Study NotesCore advantages of JAVA: cross-platform-JVM (JAVA Virtual Machine) Implementation of JVM: a standard i

[Java Study Notes] java language core-this keyword of object-oriented, java Study Notes

[Java Study Notes] java language core-this keyword of object-oriented, java Study NotesI. this keyword Embodiment: You can useThis keywordIn the constructor to call other constructor.Principle:Indicates the current object.This is the reference of the object to which the fun

Java study note 11 -- Summary of the set and java study note 11 --

Java study note 11 -- Summary of the set and java study note 11 -- Java learning notes series: Java Study Notes 10-generic Summary Java

Java Study Notes 10 -- generic summary, java Study Notes 10 -- generic

Java Study Notes 10 -- generic summary, java Study Notes 10 -- generic Java learning notes series: Java study notes 9-internal class Summary Java

Java study notes 7 -- abstract classes and abstract methods, java study notes 7 -- Abstract

Java study notes 7 -- abstract classes and abstract methods, java study notes 7 -- Abstract Next, we learned the following: Java study Note 6-class inheritance, Object class Java

Java Study Notes 54 (reflection details) and java Study Notes 54

Java Study Notes 54 (reflection details) and java Study Notes 54 Reflection concept: The java reflection mechanism is in the running state. All attributes and methods can be known for any class. Any method and attribute of an object can be called. This dynamic acquisition an

Java study notes 5-class methods, java study notes 5 --

Java study notes 5-class methods, java study notes 5 -- URL: http://www.cnblogs.com/archimedes/p/java-study-note5.html.1. Method Control Process There are three main process control structures in

JAVA study notes, java Study Notes Lin Xinliang

JAVA study notes, java Study Notes Lin Xinliang Previously, I learned about sequential programming. A program can only perform one step at any time. As the first class of concurrent programming, I am very excited. 1. Define a task Implement the Runnable interface and compile the run () method (the thread will execute t

Java Study Notes (2), java Study Notes

Java Study Notes (2), java Study NotesPlease note the shortcomingsI,Basic knowledge1, SDKLatest download Search for oracle and go to the website. Select "Downloads"> "JavaSEI" to select the first download (in factJavaDifferences between 8u111 and 8u112In8u111On the basis of the optimization, upgraded to a lower level,

JAVA Study Notes ()-classic three-tier architecture example, java Study Notes

JAVA Study Notes ()-classic three-tier architecture example, java Study NotesUserDAO Interface /** UserDAO interface */public interface UserDAO {// insert the User public void insert (user User); // delete the user public void delete (int id ); // update the User public void update (user User); // query all users publi

Java study notes 44 (multithreading 1) and java Study Notes

Java study notes 44 (multithreading 1) and java Study Notes Concept of multithreading: omitted Multi-threaded objective: to improve efficiency Main thread: Package demo; // main thread public class Demo {public static void main (String [] args) {function (); System. out. println (1);} public static void function () {f

Java study notes 35 (exception) and java study notes 35

Java study notes 35 (exception) and java study notes 35 An exception occurs when the code is running. Java encapsulates multiple exceptions into multiple classes. When a program encounters a problem, it creates an exception class object and throws related information. Excep

JAVA Study Notes (3) and java Study Notes

JAVA Study Notes (3) and java Study Notes @ SuppressWarnings ("resource") is used to suppress resource leakage warnings. For example, if I/O class is used, it is not closed.Set features:1) unordered, not random2) unique element3) No subscriptNote: Collection List Set is an interfaceNote: Because the Set does not have a

JAVA Study Notes (20)-collection List, java Study Notes

JAVA Study Notes (20)-collection List, java Study NotesArrayList set /** ArrayList, which implements the List interface *. When declaring an array, you must specify the element type in the array, which can be the basic data type, it can also be a reference data type * When declaring a set, you can not specify the type

Java study notes 9, java Study Notes

Java study notes 9, java Study Notes If the object of a class is finite and fixed, such as the seasonal class, it has only four objects. For example, if an instance is finite and fixed Is called an enumeration class. Enumeration classes are newly added in Java 5. The enum

Java Study Notes 10, java Study Notes

Java Study Notes 10, java Study Notes When a program creates objects, arrays, and other reference objects, the system allocates a memory area for them in the heap memory, and the objects are stored in the memory area, When the object we create is no longer referenced, the memory will become garbage, and finally wait f

Java Study Notes (2), java Study Notes

Java Study Notes (2), java Study NotesI. Common java Data Types Data Type Bytes occupied Note: Int 4 Char 2 Double 8 Float 4 Float a = 2f; (f or F must be added; otherwise, the default value is dou

Control Execution Process -- (Java study note 3), java Study Notes

Control Execution Process -- (Java study note 3), java Study NotesThe most basic form of if-else control program flow Format:If (boolean-expresion ){Statement}OrIf (boolean-expresion ){Statement} Else {Statement}Example: public static int testIf(int testVal,int target){ int result = 0; if(testVal > target){ result+

Java Study Notes 45 (multithreading 2: security issues and solutions), java Study Notes

Java Study Notes 45 (multithreading 2: security issues and solutions), java Study Notes Thread security issues and solutions: Security issues occur when multiple threads use one shared data. A classic case: Tickets are sold in cinemas, with a total of 100 seats and a maximum of 100 tickets. There are many ways to buy

Java Study Notes 12, java Study Notes

Java Study Notes 12, java Study Notes The Object class is the parent class of all classes, arrays, and enumeration classes. It is the root class of the class hierarchy. Each class uses an Object as a superclass. All objects (including Array. The Object class implements the following methods: Let's take a look at the

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