java nested class example

original variable is changed in the method, and the local inner class is changed, there is no guarantee that the copy is consistent with the original variable (so: they should have been the same variable.)Bottom line: The rule is a helpless one. It also shows that the design of programming language is limited by the implementation technology. This is one example. Because: I see a lot of people hold this vi

group is always a sub-sequence that matches the group most recently. If the group is recalculated because of quantization, it retains its previously captured value (if any) on the second calculation failure, for example, the string "ABA" with an expression (a (b)?). + matches, the second group is set to "B". At the beginning of each match, all captured input is discarded.Second, detailed pattern class and

always a sub-sequence that matches the group most recently. If the group is recalculated because of quantization, it retains its previously captured value (if any) on the second calculation failure, for example, the string "ABA" with an expression (a (b)?). + matches, the second group is set to "B". At the beginning of each match, all captured input is discarded. Second, detailed pattern class and Mat

Writing a multithreaded program today, discovering that inside a method defines an inner class, if the inner class calls the variable in the method, then the variable must be declared as the final type, baffled, and then thought of as the cause of the life cycle, because the variable defined in the method is a local variable, leaving the method, the variable loses its function , it will automatically be eli

On the mobile phone, the offline map package is usually placed on the SD card and then read through the file. For the sake of simplicity, put offline in the Resource Directory of the example and compile it with the application. In actual applications, store these map packages separately. The Guide bee map development kit supports reading multiple map packages at the same time. This is done through the MapTiledZone

declaration is used, the class name should be exactly the same as the file name, that is, "Hellodemo.java" should be used to represent the name of the class. If the declaration of a class uses class, the class name can be inconsistent with the file name, but execution is de

fields of the static final type 1. Overview Field table setIs composed of severalField table (field_info). For several fields defined in the classJVMCompileClassAfter the file, the corresponding field information is organized into a structure called the field table set. The field table set is a class array structure, as shown in: Note: The fields mentioned here refer to static or non-static variables defined in the

, the log records include version. FX (1), while in V2 it is version. FX (2 ). Place the two classes with slight differences under a classpath and run the test class:Set classpath =.; % current_root %/V1; % current_root %/V2% java_home %/bin/Java Test Figure 3 shows the console output. We can see that the code corresponding to version. FX (1) is executed, because the Class Loader first sees the code of this

: ', Son. _ name _) # print ('base class inherited by the type', Son. _ bases _) # print ('Type dictionary: ', Son. _ dict _) # print ('module of Type: ', Son. _ module _) # print instance type ('instance type: ', Son (). _ class __) The running effect is as follows: Python 3.3.2 (v3.3.2: d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32Type "copyright", "credits" or "license () "for

= managers; The process of assigning the value of employees must be the manager type, from the above example can be seen, run time will do such checks, but compile time will not be checked so deep, Only check the declaration type of the variable, it seems the Java compiler is not smart enough AH:)3. In the actual programming process, the use of the object variable polymorphism must be noted (especially whe

Static load Class in Java is the compile time load class dynamic load class refers to the runtime load classWhat's the difference?As an example, I now create a class implementation function that assumes that specific classes and m

Java String Class (Java.lang.String) is the most used class in Java, and is also the most special class, and many times we are both familiar and unfamiliar with it. A fundamental understanding of the Java.lang.String class and st

Reprinted: 1190000004597758This paper mainly discusses the loading mechanism of Java class, including the class loader, loading process and initialization time.First, class loader 1, ClassLoader abstract classThe task of the ClassLoader is to read the binary bytes of this class