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Java historySun's 1995 launch, secure, portable, cross-platform, was acquired by Oracle in 2009.Java architecture: SE standard EE enterprise version me mobileJava Cross-platform principle: Java source code--Compile--java bytecode

When viewing the mat document, this describes the shallow heap: shallowheap is the memory consumed by one object. An object needs + or (depending on the OS architecture) per reference, 4 bytes per Integer, 8 bytesper Long, etc. Depending on the heap

Basic data types Size Range Default value int (shaping) 32 -2147483648~2147483648 0 Long (length shaping) 64 -9233372036854477808~9233372036854477808 0 Float

Introduction of today's content1. Variables2. Operators01 Overview of Variables* A: 什么是变量? * a: 变量是一个内存中的小盒子（小容器），容器是什么？生活中也有很多容器，例如水杯是容器，用来装载水；你家里的大衣柜是容器，用来装载衣裤；饭盒是容器，用来装载饭菜。那么变量是装载什么的呢？答案是数据！结论：变量是内存中装载数据的小盒子，你只能用它来存数据和取数据。02 Computer storage

One, polymorphic1. Polymorphism exists in inheritance and interfaces.2. The indeterminate behavior is placed in the parent class.3. Subclasses must override the indeterminate behavior in the parent class.Second, abstract class1. Keyword

The data types in Java are divided into basic data types and reference data types, basically branching structure as follows:Java Data type:Basic data type:Numeric type:Integer type: Byte:8 bit, data range -128~127, wrapper class: Java.lang.ByteShort:

/*Basic JavaScript Learning SummaryThis summary uses the DW to write, in order to debug conveniently, will affect the test part to write in the annotation form ****/All tests are shown with the alert () function1, JavaScript special characters//in

Sort out the Java basic data types and the knowledge that the interview might involve. Number of bytes (byte) Number of bits (bit) Range of values Integral type Byte 1 8 -2^7 ~ 2^7

Original URL: http://www.cnblogs.com/freeabyss/archive/2013/05/15/3187057.htmlString LookupThe string provides two ways to find a string, namely the IndexOf and LastIndexOf methods.1, indexOf (String s)The method is used to return the index position

http://www.verejava.com/?id=1699255932129/**java is divided into 4 classes of 8 basic data Types 4 classes: 1. Integral type (Byte,short,int,long) 2. Floating-point type (float,double) 3. Character type (char) 4. Boolean (Boolean) */public

/*The cross-platform reason for Java:JVMJVM: responsible for Execution of Java programsJre:java Program Runtime Environment, contains the jvmaJDK: Development Kit that contains the JREWhy set the installation path of the JDK in the environment

First, the data types in Java are divided into two broad categories:1. Basic data type/native data type (total eight)Integer type: Byte (1 bytes), short (2 bytes), int (4 bytes), Long (8 bytes). "Byte,shuort,int,long The only difference is the size

Data types for JavaFirst, the underlying data type:It is divided into numerical, character and Boolean types.Where: Numerical type is divided into integral type, floating point typeInteger: int, accounting for four bytesShortLongByteFloat type:

Each language will be designed to a lot of data, so you will be exposed to different data types, the initial contact data type is also dizzy, in the Java language, finally a little understand, comb, and June mutual encouragement. Concept of

1.Java Development Environment:1) Java compilation run process:-----------Common face questions1.1) Compile period:. Java source files, compiled, generate. Class bytecode files1.2) Runtime: JVM loads. Class and runs. Class (0 and 1)Features:

------Java Training, Android training, iOS training,. NET training, look forward to communicating with you! -------In a program, you might need to define an alias for some integers, and we can do this with the preprocessing directive # define, and

1, Classpath is to save the location of the. class file, provide the first place to run the Java command, if "." is added, the query will be prioritized in the current directory; "." Put it in the backPrioritized query settings for the directory. No

  Identifier keyword Java basic data type (four classes eight, type (size): Byte character type: Byte (1), char (2), Integer: Short (2), int (4), Long (8), float: float (4), double (8), Logical Type: Boolean (1)) operator expression and statement

1. Overloading: Different parameters with the same nameOverride: same name with same parameter return type (the method body is consistent with the parent class), only exists in the inheritance relationship (polymorphic), requires the parent class to

The seed module is also called the Core module, which is the first part of the framework to perform. Even if a single file function library like jquery, its interior is also divided into many modules, there must be some modules executed immediately