java project ideas

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82.JAVA Programming Ideas--about garbage collection

82.JAVA Programming Ideas--about garbage collection"It's hard to believe that Java can be as fast as C + + and even faster. ”According to my own practice, this assertion is true. However, I also find that many of the doubts about speed come from early implementations. Because these methods are not particularly effective, there is no model for reference, and the r

Java Design Ideas (1)

Preface: The next study is very important in Java, is also very abstract things, a kind of imaginative achievement here inexpressible feeling, but not so mysterious, to believe that the code is good, these are nothing to plug. However, design ideas need to be constantly learning, continuous understanding, to better understand the design ideas. One, the componentB

Java Programming Ideas Learn Note 1

dealing with multiple tasks at the same time. Many programming problems require that the program be able to stop the work being done, turn to some other problem, and then return to the main process.We can improve the responsiveness of the program by splitting the task into several separate parts. These concepts are called "concurrency" in the program, which are called threads by the parts that run independently of each other.But there is one hidden danger: sharing resources . If there are multi

Java Programming Ideas (I. Introduction to Objects)

uses dynamic memory allocation in its full form. Whenever you want to create a new object, use the New keyword to construct a dynamic instance of this object.The life cycle of the object. For languages that allow objects to be created on the stack, the compiler can determine when an object survives and can automatically destroy it. However, if you create an object on a heap, the compiler knows nothing about its life cycle. Java provides a garbage col

Java programming Ideas After reading notes: one, label

outer loop!//continue the second external loopI=5 ThisIs the start of outer loop!//i=5, continue+ tag name, directly out of the internal loop, to perform the third external loop, and then print the outer loop start part againI=7//at this point, the break+ tag name, directly out of the external loop, execution end. Indeed, the use of tags is very rare, the current personal contact is not present in the project, but for complex logic judgment, design m

Java Programming Ideas (vi, access rights control)

Access control (or hiding a specific implementation) is related to the "initial implementation is inappropriate". It's easy to refactor the code in the future without having to make too many changes to the business layer. As a result, Java provides access control modifiers for class library developers to indicate to the client programmer what is available and what is not.The level of access control, from maximum permissions to minimum permissions, is:

Java Programming Ideas-object-oriented and JVM basics

4 Types of access permissions in 1.java(1). Public maximum access control permission, which is visible to all classes.(2). Protect the same package is visible, not all subclasses of the same package are visible.(3). The default package access permission, that is, the classes in the same package can be visible, by default, do not explicitly specify access control permissions when it is the default package access rights.(4). Private most strict Russian

"Java Programming Ideas-fourth Edition" chapter II: Everything is an object

Java Programming Idea-the fourth edition of the Learning Summary, this is the second chapter: Everything is an object. Package Com.w3cjava.second; @SuppressWarnings ("All") public class Second {/** * Java Programming Ideas (Fourth Edition) * Chapter 2nd everything is an object * @param args */public static void main (string[] args) {/** * 2.1 with ref

Java Programming Ideas-Directory

initialization5.2 Method Overloading5.2.1 Distinguishing Overloaded methods5.2.2 involves basic types of overloads5.2.3 to differentiate overloaded methods with return values5.3 Default Constructors5.4 This keyword5.4.1 calling the constructor in the constructor5.4.2 The meaning of static5.5 Cleanup: End Processing and garbage collectionWhat is the purpose of 5.5.1 finalize ()5.5.2, you have to clean up.5.5.3 Termination conditionsHow the 5.5.4 garbage collector works5.6 Member Initialization5.

Java Programming Ideas Learn Note 12

12. Error handling by exceptionThe basic idea of Java is that "poorly structured code cannot run."The purpose of exception handling in Java is to simplify the generation of large, reliable programs by using less than the current amount of code, and this way you can make yourself more confident: There are no unhandled errors in your program.1. Concept C and other early languages often have multiple error-han

Java programming ideas object set (array, list, set, MAP) 1

overwritten at the same time (). 21. Functional methods of MAP: "Key" must be uniqueWhile "value" can be repeated. import java.util.HashMap;import java.util.Map;import java.util.Random;class Counter{ int i = 1; public String toString(){ return Integer.toString(i); }}public class Statistics{ private static Random rand = new Random(); public static void main(String[] args){ Map Here, why not use integer instead to write another counter class? Cause:Once an object of the

Java Programming Ideas (16)--Contact the JVM and talk about class

specific difference?Referenced by: Http://www.coderanch.com/t/516460/java/java/newInstance-difference-betT. Huy Nguyen said.An obvious difference is, the class ' s fully qualified name can be dynamically constructed/read from file/changed when You use "newinstance"."Newinstance" also requires the Java class to a No-arg constructor, else you'll get error at runti

Java Programming Ideas (2)

Call the base class constructor, this step will be repeated recursively, first of all to construct this level of the root, and then the next layer of export class, until the bottom of the export class. Initializes a method that invokes a member in declaration order. Invokes the constructor principal of the exported class. Note: The only methods in the constructor that are safe to call are the final methods in the base class, because they are not overwritten.Example13. Polymorph

Some ideas of the Java interface

of our interfaces. For example, the Java JDBC and Java web of the series of interfaces, sun company defined a complete set of JDBC interface for the manufacturer to implement, and the database is not necessary for the trial of the database to understand how a specific product is implemented, as long as the JDBC interface is called to be good When our database is replaced, it is better to change the driver

Java Programming Ideas (VIII, polymorphic)

program run from Mercedes to BMW or to Audi (this is also called State mode). But inherit, I once new, Mercedes Benz is Mercedes-Benz, and can no longer become a BMW. We cannot decide to inherit different objects during the run.1), pure inheritance and extension. Pure inheritance: Only methods that have been established in the base class can be overridden in the export class. is the "is-a" relationship. Because the interface of a class has already determined what it should be. Inheritance ensur

How the Java garbage Collection period works (programming ideas)

increase, the garbage collection period will be fully cleaned up periodically ———— large objects will still not be copied (only their algebra will increase), and the chunks containing small objects are copied and organized. Java Virtual opportunities are monitored, and if all objects are stable and the garbage collector becomes less efficient, switch to the "mark-sweep" mode, and the Java Virtual Opportuni

Introduction to Java Packaging ideas

First, Introduction  This chapter upgrades the crossword puzzle game 1.0 in the first article , and then gives the reader a brief introduction to Some of the knowledge and implementation ideas of the packaging concept in JAVA. Ii. Introduction to the concept of encapsulation Three basic features are proposed in object-oriented programming: encapsulation, inheritance and polymorphism. Among them, encapsulat

Java programming Ideas-fifth chapter-some exercises

(String name) {THIS.name =Name }voidSetempty () {isfull =False; }voidSetfull () {isfull =True; } @OverrideProtectedvoidFinalize () {if (!Isfull) {System.OUT.PRINTLN (name +": Clean"); }//Super.finalize ();}}ClassMain {PublicStaticvoid main (string[] args) {Tank T1 = new Tank (" t1); Tank t2 = new Tank ( "t2 "); Tank t3 = new Tank ( "t3 "); T1.setfull (); T2.setempty (); T1 = nullnull; T3 = null; System.GC (); }} /** * output:t3: Cleanup T2: Clean *///:~ /span>

Java (ii)--oop design ideas

(i) The origin of OOP ideas in JavaMachine language-Direct computer instructions, instructions, data, addresses are "0" and "1" Composition: can be directly executed by the computer.assembly language-with easy-to-understand and memorable symbols for instructions, data, and registers, the abstraction level is low and programmers need to consider a lot of machine details.High-level language-the natural language of the military, the structure of data and

Java Programming Ideas (2)

garbage collector can greatly simplify programming and increase security during memory management. Some garbage collectors can even erase other resources, shapes and file handles, and so on. However, the garbage collector does increase the run-time overhead. But it's hard to see how much of this overhead is going to happen, because the overall performance of the Java interpreter is still slow so far.the creation process of an object(1) When an object

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