effective java 3rd edition

/*** Effective Java Second Edition* 30th: Use enum instead of int constant*/Import Java.util.HashMap;Import Java.util.Map;public class Enumtest {/* Media operation */Public final static int START = 1;Public final static int PAUSE = 2;Public final static int RESUME = 3;Public final static int STOP = 4;/* Return results */Public final static int ret_ok = 1;private

The compiler generates a public, parameterless default constructor only if the class does not contain an explicit constructor. This class cannot be instantiated as long as a class contains a private constructor. Example:1 //Tool Class2 Public classUtilityclass {3 //Private Constructors4 PrivateUtilityclass {5 Throw Newassertionerror ();6 }7 8 //Other operations ...9}　　Assertionerror avoid invoking the constructor inside the class to ensure that the class is not inst

up when a new entry is added to the cache. The Linkedhashmap class can implement the latter through its Removeeldestentry method. For more complex caches, you must use Java.lang.ref directly.A third common source of memory leaks is listeners and other callbacks.If the client registers callbacks in its own implementation of the API, but does not explicitly unregister, they will accumulate unless some action is taken. The best way to ensure that callbacks are immediately treated as garbage collec

Tips"Effective Java, third Edition" an English version has been published, the second edition of this book presumably many people have read, known as one of the four major Java books, but the second edition of 2009 published, to n

Tips"Effective Java, third Edition" an English version has been published, the second edition of this book presumably many people have read, known as one of the four major Java books, but the second edition of 2009 published, to n

; } PublicBuilder Calories (intcalories) { This. Calories =calories; return This; } PublicBuilder Fat (intfat) { This. Fat =fat; return This; } PublicBuilder Sodium (intsodium) { This. sodium =sodium; return This; } PublicBuilder Carbohydrate (intcarbohydrate) { This. Carbohydrate =carbohydrate; return This; } PublicNutritionfactsbuilder Build () {return NewNutritionfactsbuilder ( This); } } Private

Tips"Effective Java, third Edition" an English version has been published, the second edition of this book presumably many people have read, known as one of the four major Java books, but the second edition of 2009 published, to n

: Network Disk DownloadEffective C + +: 55 specific practices for improving procedures and Design (3rd edition) (Chinese version) Introduction: Some people say that C + + programmers can be divided into two categories, read effective C + + and unread. The third edition of the world-Class C + + Master Scott Meyers's fam

the formal parameters synchronously Para1 Console.info (Arguments[1]);//-1 Para2 = 2; Console.info (Arguments[1]);//2, modify the formal parameter para2, will be synchronized modify ARGUMENTS[1] Console.info (PARA3);//undefined, the formal parameter not passed in the actual parameter is undefined ARGUMENTS[2] = 3; Console.info (arguments[2]);//3 Console.info (PARA3);//undefined, formal parameters that do not accept actual arguments do not have a sync relationship Console.info (Arg

In the beginning of the advent of JavaScript, no one will think it will be applied so widely, but also far more complex than most people imagine, in the process of my own learning, there have been many shocks, but often not long, a lot of beautiful use is blurred again, I hope that through the JavaScript Advanced Programming (3rd Edition) of the topic of learning notes, can be more systematic to comb the ba

 Directory:1th Edition: http://blog.csdn.net/vipbooks/article/details/519121432nd edition: http://blog.csdn.net/vipbooks/article/details/519125373rd Edition: http://blog.csdn.net/vipbooks/article/details/519127504th Edition: http://blog.csdn.net/vipbooks/article/details/51912930These days from work home to play chick

import and test 22.2.5 reference count 22.2.6 thread and Global Interpreter lock (GIL) 22.3 Related Topics 22.4 Practice Chapter 23rd　Other topics 23.1 Web services 23.2 using WIN32 COM to operate Microsoft Office23.2.1 Client COM programming 23.2.2 Microsoft Excel23.2.3 Microsoft Word 1th python core 23.2.4　Microsoft PowerPoint23.2.5 Microsoft Outlook23.2.6 Medium Size Example 23.3 write Python and Java programs with Jython 23.3.1 What is Jython23.4

can be a variable, or even an expression. The switch statement uses the strict equality operator when comparing values, so type conversions do not occur. Any function can implement the return value at any time by the return statement followed by the value to be returned, and any code after the return statement will never be executed. Strict mode has some limitations on functions: The function cannot be named eval or arguments;The parameter cannot be named eval or arguments;Two name

method is actually a property, Just the value type of the attribute is a function, we also call it a method: Category Properties/Methods Description Property Constructor Point to the function used to create the current object Method hasOwnProperty (PropertyName) Checks whether the given property is in the current object instance propertyIsEnumerable (PropertyName) Checks whether a given property can be enumerated by

today, why the day code has more than 1000 lines, will it be because I sometimes the local files are all deleted, and then downloaded from the code cloud caused it?Learning progress Bar lines of code (new/cumulative) Blog Volume (Add/accumulate) Learning Time (new/cumulative) Important Growth Goal 3000 rows 30 Articles 400 hours First week 200/200 1/1 15/15 Second

progress Bar Lines of code (new/cumulative) Blog volume (Add/accumulate) Learning time (new/cumulative) Important growth Goal 3500 rows 28 Articles 300 hours First week 200/200 1/1 10/10 Second week 300/500 1/2 20/30 Third week 300/800 2/4 20/50 Week Four Week Five

, there are many places to see a few times can not understand, through comparative learning materials and video, just understand some obscure content.Problems in code debugging and the resolution processTo the students to learn the use of idea, learned to create a new class in the SRC folder, in order to run the code, because it is a copy of the code, so in writing and running the process did not appear any problems.Other (sentiment, thinking, etc., optional)Although not with idea, Baidu can not

arrays:for (int score:scores) {System.out.printf ("Student Score:%d%n", score);}After reading the textbook carefully, we find that the meaning of the above code can be interpreted as:for (int i=0;iThis enhanced for loop is easier, and his idea is that the above program fragment takes the first element of the scores array, assigns it to the score variable, executes the loop body, and so on, until all the elements in the scores array have been accessed.Problems in code debugging and the resolutio

294/300 3/7 22/60 Try to record "planned learning time" and "actual learning time" to see if you can improve your planning skills by the end of the semester. This work is very important and useful in learning. Time-consuming estimates of the formula: y=x+x/n, y=x-x/n, the number of training, X, Y is close.Reference: Why is it so difficult to estimate software engineering applications, software engineering estimation methods Planned study time: xx hours

second week 200/300 1/3 15/25 third week 189/489 1/4 20/45 Planned study time: 25 hours Actual learning time: 20 hours Improved situation: This week's learning content is a bit more, need to understand more places, many places the correlation needs to be more detailed analysis, using the book and video combination of methods. Overall the progress from learning time, but s