java reference guide

are derived from Jobject, using the inheritance structure characteristics of C + +, using the corresponding type.For example, see the following:Class _jobject {}; Class _jclass:public _jobject {}; Class _jstring:public _jobject {}; Class _jarray:public _jobject {}; Class _jbooleanarray:public _jarray {}; Class _jbytearray:public _jarray {}; ...2. The JNI hypothesis is written using C language. All reference types use Jobject, and other

++：先计算，后赋值21. What are the structure of the program?顺序结构选择结构循环结构22. How are there several ways to instantiate an array?Static instantiation: When an array is created, the elements in the array are specified,Int[] A=new int[]{1,3,3}Dynamic instantiation: When an array is instantiated, only the extent of the array is specified, and all elements in the array are the default values of the array typeVarious data defaults in 23.JavaByte,short,int,long默认是都是0Boolean默认值是falseChar类型的默认值是’’Float与double类型的默

Scanner classWe're going to learn that the scanner class belongs to the reference data type, and we first understand the reference data type.Use of reference data typesUnlike defining basic data type variables, variable definitions and assignments of reference data types have a relatively fixed step or format.Data type

From a freshman self-taught Java has been two years, conscious already can independently, (in fact, far less), has been reading recently. About Java four kinds of reference types, I also just understand, hereby note! Four levels of references are available in Java: Strong references, soft references, weak reference

data type of the return value. such as: Callstaticintmethod2, call the instance method using the CALLXXXMETHOD/V/A function, XXX represents the returned data type, such as: Callintmethod3. Get the ID of an instance method, use the Getmethodid function, pass in the method name and method signature4, obtained with the ID of a static method, using the Getstaticmethodid function, passing in the method name and method signature5. Get the constructor method ID, using the "6. Get a class instance of t

Articles reproduced from Zejian's blog http://blog.csdn.net/javazejian/article/details/51192130Java value Delivery and reference delivery are generally involved in interviews, and today we're going to talk about this, first of all we have to realize that this problem is generally relative to the function, that is, the method parameters in Java, So let's review the two professional terms in the programming l

Java World Rohit-class masterpiece "Thinking in Java" cut into Java and put forward "everything is Object". In Java, an object-filled world, reference is the root of all puzzles, and all the stories begin here.What is reference?If

http://ifeve.com/java-atomic/Atomic Package Usage Guide in JavaThis article starts in the concurrent network, the square takeoffIntroductionJava provides the java.util.concurrent.atomic package from JDK1.5, allowing programmers to perform atomic operations without locking in a multithreaded environment. The bottom of the atomic variable uses the atomic instructions provided by the processor, but different C

ordinary class, an enumeration class, an interface, or a annotation type ( @interface ) The term comment is used only to refer to the implementation of annotations (Implementation comments), we do not use the word "documentation comments", but rather javadoc. Other term descriptions will occasionally appear in subsequent documents.1.2 Guide NotesThe sample code in this document is not a specification. That said, while the sample code follows