effective java 2nd edition

: Because it is unclear why to write%2d, so the Internet to find information, get the following explanations:System.out.printf ("%d*%d=%2d", X, Y, z);%d is output as a decimal integer, and%2d is the output of at least two characters in a decimal integer.Operation Result:If x=1,y=2,z=2, 1*2= 2 (note that the last 2 occupies two characters in length)If x=2,y=5,z=10, 2*5=10Other (sentiment, thinking, etc., optional)The first time I used idea, I found that it was really handy to write

variables note the Camel case nomenclature constants for variable names in Java are named with the final decoration in accordance with Min-length max-information, not in Hanyu Pinyin, Refer to naming conventions and Google Java Style. Before local variables are used to initialize literal constants (Literal constant) integers can be binary (0bdddd), octal (0DDD), Decimal (dddd), hexadecimal (0XDDDD), in

Brief introduction As you learned in part 1th of this series (three articles), monitoring the availability and performance of Java applications and dependencies in production is critical to ensuring problem detection and accelerating problem diagnosis and repair. Source-code-level inserts for classes that need to be monitored have the advantages that are discussed in part 1th, but this method is often not available or impractical. For example, many o

following can be a statement, because they do not.Other (sentiment, thinking, etc., optional)I thought the Java language and C language could be very different, because one is a process oriented, one is object-oriented, but after this week's study I find that the two are so similar in syntax. Because the grammar of the C language mastered the basic clearance, so I feel that this week's learning task is not very difficult, I am very gratified at the s

. Learning progress Bar lines of code (new/cumulative) Blog Volume (Add/accumulate) Learning Time (new/cumulative) Important Growth Goal 5000 rows 30 Articles 400 hours Second week 426/426 3/3 12/12 Resources "Java2 Practical Course (Fifth Edition)" Learning Guide Tips for how to turn off internal errors, sy

and the resolution processA diagram error occurred while compiling code Example3_1The error indicates that you have written the name of a variable incorrectly, and that the change is successful.Code Hosting(run result of statistics.sh script)Last week's summary of the wrong quizIn this blog postLearning progress Bar lines of code (new/cumulative) Blog Volume (Add/accumulate) Learning Time (new/cumulative) Important Growth Goal 5000

, he is non-buffered. Code HostingSentimentThe most important thing to learn a program language is more practice, first of all, even if you do not understand the code, can only look at other people's code to play, see more gradually will understand, at least understand the basic framework of the language, how to start, how to describe, what is the routine. After that, the program will be able to fully understand the meaning of the code.Learning progress Bar Code lines

processSometimes we encounter when assigning a value that exceeds the defined range, for example, if we can easily exceed its upper limit of 127 when defined as byte, or if the precision is not correct, for example, the value we assign when using float in the definition exceeds its precision, thus making an errorProblems in code debugging and the resolution processYi Know i = 8, but what about J? 8? Or is it 8.8?ResultsSomething went wrong! Why, is it not mandatory to convert int i into a doubl

"\".Next, I want to print the string \hello world\, the following is the initial code:Failed again, please teach a bully to understand that the \ causes the compiler to ignore the original H and the last ", resulting in incomplete programs and syntax errors (unable to print the string), after debugging code as follows:Other (sentiment, thinking, etc., optional)Previously practiced in the C language course, I think this practice let me reap the most is to ignore the use of symbols and the use of

Maximizing the security of Java Web applications using Rational AppScan This is the 2nd part of a series of tutorials that uses rational®application Developer, Data Studio, and Rational AppScan to create secure, java® based WEB applications. In part 1th, you have developed a Java WEB application using Rational applica

The 5th edition of the Java™ language specification adds 10 new methods to Java.lang.Math and Java.lang.StrictMath, and Java 6 adds 10 more. The 1th part of this two-part series introduces a new and meaningful mathematical approach. It provides a function that mathematicians are familiar with in the age when computers are not present. In the

beans can send JMS messages, but only those JMS messages can be received synchronously. It is possible to bind server-side resources because the component must wait for the message to be received. In Java 2 Platform, Enterprise Edition (EE) 1.3, a new Enterprise JavaBean (EJB)--mdb was introduced. This EJB is like a JMS listener, allowing the Java application to

://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd Http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd " > Beans>At this point, no beans have been defined, so no beans can be fetched from the container4. Create a new class Screwdriver.java under src/main/java/Package:com.netease.nanodegree; Package Com.netease.nanodegree; Public class Screw

java.io.*; The other boilerplate is similarly omitted. The book ' s Web site, http://java.sun.com/docs/books/effective, contains a expanded version of each example, which can Compile and run. Similar omissions are also available in other examples. This book's website: Http://java.sun.com/docs/books/effective, contains an extended version of each example that you can compile and run. For the most part, thi

This blog is the Java Classic book "Effective Java (second Edition)" Reading notes, this book a total of 78 to write high-quality Java code Recommendations, I will try to explain it more easily, so the blog updates about 1 months.1th: Consider replacing the constructor with

superclass will be executed.Because the end method chain does not execute automatically, we need to ensure this manually.Method One: Use the TRY–FINALIZE code structure@Overrideprotected void Finalize () throws Throwable {try{.....//finalize Subclass State} finally {Super.finalize ();}}Method Two: Use Finalizer Guardian (end method Guardian)Class A {End GuardianPrivate Final Object Finalizerguardian = new Object () {@OverrideThe end method of the end Guardian will be executedprotected void Fina

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