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:" + getthumbprint (cert));Conn.disconnect ();}private static String Getthumbprint (X509Certificate cert) throws Exception {MessageDigest MD = messagedigest.getinstance ("SHA-1");byte[] der = cert.getencoded ();Md.update (der);Byte[] Digest = Md.digest ();Return Bytestohexstring (Digest);}private static String bytestohexstring (byte[] src) {StringBuilder StringBuilder = new StringBuilder ("");if (src = = NULL | | src.length return null;}for (int i = 0; i int v = src[i] 0xFF;String HV = integer.

:" +getthumbprint (cert)); Conn.disconnect (); } Private StaticString getthumbprint (X509Certificate cert)throwsException {messagedigest MD= Messagedigest.getinstance ("SHA-1"); byte[] der =cert.getencoded (); Md.update (der); byte[] Digest =md.digest (); returnbytestohexstring (Digest); } Private StaticString bytestohexstring (byte[] src) {StringBuilder StringBuilder=NewStringBuilder (""); if(src = =NULL|| Src.length ) { return NULL; } for(inti = 0; i )

the objects in the the queue, but can modify the order by providing your own Comparator. The Priorityqueue ensures if you call Peek (), poll () or remove (), the element you get would be the one with the high EST priority.Collection vs. InteratorCollection:appeared because of commonality between other interfacesAbstractcollection:provides a default implementation for a Collection, so the can create a new subtype of Abstractco Llection without unneces

to call inside a constructor is those that is final in the base class. (This also applies to private methods, which is automatically final.)Convariant return typesJava SE5 adds convariant return types, which means, a overridden method in a derived class can return a type derived From the type returned by the Base-class methodDesigning with InheritanceIf you choose inheritance First when you ' re using a existing class to make a new class, things can become needlessly comp Licated.A better appro

get a runtime error called an EX Ception.Downcasting and the runtime checks require extra time for the running program and extra effort from the programmer.The solution is called a parameterized type mechanism. (Java se5,called generics)A parameterized type (compiler-level technology) is a class, the compiler can automatically customize to work with particular Types.Object Creation LifetimeWhen to destroy

Building a Java development environmentDeveloping MyEclipse with development toolsBase Core: Javaseeeme Object-oriented API JVM.Java EE refers to Edition,java Enterprise Edition, which is used for enterprise-level development, including web development and many otherJavase refers to

circumstances to 8 screen around to display. This makes it difficult to read a program or modify a program. It is therefore advisable to extract the block that completes the comparison of independent functions as a single function. A block that accomplishes the same or similar function is extracted independently of a sub-function. It can be found that the simpler the upper-level function is, the more specific work is done by invoking a few sub-functions, the more the underlying function complet

interview and other books? First of all, I work in this company so far is still relatively happy, the boss is more open-minded, allowing me to play in the module I am better at, so there is no intention of leaving, but in case of resignation for some reason? The short-term effect of this book can not only supplement the basic knowledge, but also better face the possibility of leaving the situation, and then chose this book to read.I will read this book at the same time, will I think there is a

application of module boundaries at build time SummarizeThis is the "effective Java third Edition" new entries, this article is just about the display of new additions, the specific content or need readers to read books to understand, I am currently in the reading, follow-up what reading sentiment will be timely and gentlemen share. So, the important question is, how to

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 now nearly 8 years, but with

be accessed.Again, you might think that anonymous classes are obsolete in the lambda age. This is closer to the truth, but there are some things you can do with anonymous classes that you can't do with Lambdas. Lambda is limited to functional interfaces only. If you want to create an instance of an abstract class, you can use an anonymous class, but you cannot use lambda. Similarly, you can use an anonymous class to create an interface instance with multiple abstract methods. Finally, Lambda ca

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 now nearly 8 years, but with

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 now nearly 8 years, but with

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

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 now nearly 8 years, but with

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 now nearly 8 years, but with

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 now nearly 8 years, but with

allows you to modify instead of creating a new object for each different string. Also, the conversion of these two kinds of objects is very easy.At the same time, we can also know that if you want to use the same content string, you do not have to new a string each time. For example, we want to initialize a string reference variable named S in the constructor, set it to the initial value, and should do this:public class Demo {Private String S;...Public Demo {s = "Initial Value";}...}Rather than

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 now nearly 8 years, but with

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 now nearly 8 years, but with