java learning path pluralsight

Recently in the "tingking in Java" This book study, the second chapter exercises the topic of practice encountered a problem, No enclosing instance of type test1 is accessible. Must qualify the allocation with an enclosing instance of type test1 (e.g. X.new A () where X was an instance of Test1.The reason for the error is that the main method is static and cannot access the dynamic class you define, that is, you cannot create a reference to the class.

months to study this 1000 more pages of the big, and then the third time around 15 days can be done, notes a large book! From then on.Choose the right book and bury the research. I'm sure we'll get started soon!Learn the Java language 8 simple parts, this is just the beginning of our study of the Java language! These all understand that at best a Java programmer

Alas, the front has been skipped, a look at the pure text description on the headache.This section is about Java data types, there are eight basic types, of which the int,short,long,byte four are shaped, is pure numbers, the size is 4,2,8,1 bytes, a byte is composed of 8 01, the highest bit is the sign bit, 0 is an integer, 1 is a negative number, For example, the range of byte is 128 to 127. I don't know the rest of it.Floating-point types have float

--system library, library informationSELECT * FROM Table_constraintsWHERE table_name = ' xxx '; (3) Remove the unique constraintALTER TABLE TB2Drop index name; (4) CHECK constraintsYou can limit the value of a field by setting its value, such as gender, age range, etc.MySQL supports checking the syntax of constraints, but without implementing constraints, MySQL does not check constraints CREATE TABLE Xuesheng (Gender ...Age ...Check (gender= ' male ' or gender= ' female '),Check (age>8 and age);

,int end,string str) is replaced with Str from start to end Public StringBuffer reverse () Flip of string Interception of StringBuffer Public String substring (int start) intercepts from the specified position to the end Public String substring (int start,int end) intercepts from the specified position to the end position, including the start position, not including the end position Note: The previous return value is StringBuffer, this time returning a string Conve

\jdk1.7.0_72\bin* B: Then enter Javac and Java separately, if some content is displayed correctly, the installation is successful.# # #01.11_java Language Basics (Directory interpretation under JDK installation path) (learn)* A:bin Directory: This directory is used to store some executable programs.* such as Javac.exe (Java compiler), Java.exe (

1: What is an exception?An event that interrupts the normal instruction flow.An exception is an object in which the virtual machine generates an exception object when an exception occurs.The class that generated the object is provided by the JDK　　　　Explain:Throwable is the base class for all exception classesError refers to errors generated by the virtual machine at run time, and when an error occurs, the virtual opportunity shuts downException refers to an exceptionRuntimeException Run-time exc

1: Package and access rightsTo place a class in a package, you need to use the package nameThe use of the-d parameter at compile time the function of this parameter is to generate the corresponding folder according to the package nameThe whole of a class should be "package name" + "." + "class name"Naming conventions for package names:Require that all letters of the package name be lowercasePackage name in general, is your domain name upside down writeA class in a package accesses the conditions

subclass does not assign a value to the parent class's variable, the parent class variable is not assigned, so the subclass must assign a value to the parent class variable① can assign a value directly to a parent class variable in a subclass② can call the Super method to invoke the parent class constructorModified Student Class: class Student extends persion{ int grade; Student () {System.out.println ( "Student parameterless constructor" int age,int grade) { super (Name,age);

,int b) {Boolean BL = a = = B;return BL;}C: Get the larger value in two numberspublic static int Getmaxnum (int a,int b) {int maxnum = (a>b)? A:B;return maxnum;}D: Print star rectangle for m row n columnsScanner sc = new Scanner ();int m = Sc.nextint ();int n = sc.nextint ();PRINTMN (M,n);public static void printmn (int m,int n) {for (int i=1;ifor (int j=1;jSystem.out.print ("*");}System.out.println ();}}E: print nn multiplication tableScanner sc = new Scanner ();int m = Sc.nextint ();int n = sc

; string attribute = (string) request.getattribute ("name"); System.out.println ("Myservletrequestlistener requestdestroyed and Request attribute:" + attribute); } public void requestinitialized (Servletrequestevent servletrequestevent) {servletrequest ServletRequest = Serv Letrequestevent.getservletrequest (); HttpServletRequest request = (httpservletrequest) servletrequest; Request.setattribute ("name", "requestinitialized"); System.out.println ("Myservletrequest

Each person's learning method is different. One person's learning method is not necessarily suitable for another person. I can only talk about my learning method. Because I learned Java completely by myself and never asked anyone, the learning process was basically e

download this version of the JDK, download the page here: http://java.sun.com/j2se/1.4.2/download.html. The downloaded JDK is an executable installer that installs a set of JRE (for browsers to use) under the C:\Program files\java\ directory after the default installation, and installs a set of JDK (also includes a JRE) under C:\j2sdk1.4.2. Then we need to add the Java

/1s1CclBZu292D2Ra0bqBUcA Password: 2lsa ③SSH Framework integrated Project Development video https://pan.baidu.com/s/1MH7cIgK3Fln4LagNpwwO6g Password: Rynt Java Web Learning STEP.6 ——— Project CombatPaper on the end of the light, it is known that the matter to preach, a good programmer, is through a step-by-step practical practice, rather than through the number of books

Re-learning java basics (1): PATH and CLASSPATH, javaclasspath I think most beginners of Java will encounter problems, that is, how to configure the environment, execute java-jar xxx. jar will report NoClassDefFindError, I also encountered these problems when I first started

-line communication. The whole system mainly includes member personal center, running forum, music running, running equipment library, professional running guide, backstage management system includes member management, information release, download to manage, professional running guide management, authority management, etc.Project two: Telecom online business Hall systemThe project is based on the data collected from the first phase of the project, the second phase of the project is designed to

. Declaring variables as final ensures that they are not changed in use, and that the variable declared as final must be given the initial value at the time of declaration, whereas in subsequent references only the non-modifiable can be read. A method that is declared final can also be used only and cannot be overridden in a subclass. Finally: usually put in the back of the Try...catch code block, which means that the program regardless of normal execution or exception, the code as long as the J

Java Learning Path (iv) methodJava as a programming language, the best way to learn is to write code. When you learn a class, you can write a simple example of the program to run, see what results, and then call a few more classes of methods, see the results of the operation, so very intuitive to the class to learn, and memory is very deep. Then you should not be

-chip microcomputer feel ironic. Now basically the Java Foundation is learning to play, because immediately to internship (listen to school arrangements, heard that the school does not allow students to find the internship unit, but we all know, learning the unique properties of the arrangement of the internship), I do not want to attend

solid enough, you will certainly need to refer to these information disciplines in the course of learning or using Java. I suggest that you can read the books of the information system in your spare time. This is the root of the way, not the immediate remedy, must have patience.2. Learn the Java languageLearning the Java