big java 4th edition

difference between the inheritance and interface, the book is very vivid examples, fish can swim, sharks are fish, clown fish is fish, so they are inheritance relationship, but people can swim, but people and fish there is no inheritance relationship, but the human and fish between the connection can be expressed by the interface. While this is understood, I cannot relate to how much of a difference these two definitions can have in a particular program. In short, to continue to learn or to fil

errors, in accordance with the error prompts are corrected. But in this week's JDB test encountered some difficulties in this blog to do a related summaryCode Hosting(run result of statistics.sh script)Last week's summary of the wrong quizLearning progress Bar lines of code (new/cumulative) Blog Volume (Add/accumulate) Learning Time (new/cumulative) Important Growth Goal 5000 rows 30 Articles 400 hours

str1 = 1 + 2 + "apples"; String str2 = "apples" + 1 + 2; System.out.println (str1); System.out.println (str2); }}Think about whether the number of apples in the output of the two strings is the same, and if so, how many?The answer is inconsistent, the value of STR1 is "3apples", the value of STR2 is "apples12", which is very large, but the "apples" changed position, why such a big change?It all stems from java's handling of th

20145129 "Java Program Design" The 4th Week study summary textbook Learning content Summary Inheritance and polypeptide The inheritance common behavior inheritance is to avoid duplicate definitions of common behavior among multiple classes. (Promote the same code to the parent class) The keyword extends: Indicates that this class extends the behavior of an

The 4th chapter of the design pattern-decoration mode (Java implementation)　　"What's the matter, brother fish?" ”"Alas, do not mention, the net bought a dress, the results found and business description of the difference is too much, the color difference on it, quality is not good, quality is not OK, unexpectedly size is not good, said 3 x, Mail is an X, do not say, return to. You start with the lecture, yo

Yesterday and today are all in the configuration of the Android development environment,The head is big, the steps are more1. Download the Java-installed JDK first, this is the most basic component2. Download the Android SDK again, http://developer.android.com/sdk/index.html this address I can not open the local, the result I only in their own VPS server first downloaded, and then uploaded to the localAfter

str1 = 1 + 2 + "apples"; String str2 = "Apples" + 1 + 2; System.out.println (STR1); System.out.println (STR2); }}Think about whether the number of apples in the output of the two strings is the same, and if so, how many?The answer is inconsistent, the value of str1 is "3apples", the value of str2 is "APPLES12", which is very large, but the "apples" changed position, why such a big change?It all stems from Java's handling of th

Big name it Edition It must be an N-layer structure,The higher the number of layers, the better. If the number of layers is lower, the user will misunderstand that we do not pay attention to it,What data access layer can be added to the entity control layer.ProgramMembers must be old birds, but they are not considered for less than 30,Foreign Company airborne troops,If you have more than 10 years of prog

Installation TutorialsHttp://www.cnblogs.com/mephisto/archive/2015/07/22/4666032.html#!commentsNew featureshttp://news.cnblogs.com/n/525553/My machine is win8.1, to install vs2015, to install the update package to April, otherwise it will always promptThe computer is too slow, the update spent 1 nights, installed VS2015, also spent 10,000, to occupy 30g, fortunately before the C-D disc merger, or the pit, loaded and left 20g,But the Java andriod part

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 object?C + + takes the approach that control

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

, Java virtual machines can better support the use of JavaScript code.Finally, I'll cover features that few people know about, such as new ways to add strings to lists and other features that can help you with your daily tasks.For more Java SE 8 features and guidelines, I recommend you refer to the Http://docs.oracle.com/javase/tutorial/official website and the Java