java in nutshell

[Java tutorial 04] basic Java syntax, 04 java In the previous article, we ran a simple java program, but did not explain the content and meaning of the Code. Learning, we need to know it, but to know it, so this article will explain the basic syntax of the java program. Afte

Recently read Java source code, found a lot of methods with native decoration, then what is the native method?In a nutshell, a native method is a Java interface that calls non-Java code. A native method is a Java approach: the implementation of this method is implemented by

relationship, feeling that MVC is very similar to the three-tier architecture, think they are not much different. In fact, in a nutshell, MVC is a design pattern, and a three-tier architecture is a layered model. MVC contains model-controller-view, note there is no "layer", it emphasizes the development of the code into these parts, through this model to implement the application development. MVC is not the exclusive web development, in fact, in the

is a reference to an object, the object is defined as active and cannot be deleted. To ensure that the memory used by the object is recycled, the programmer must ensure that the object does not arrive. This is usually done by setting the object field to null or removing the object from the collection (collection). However, note that it is not necessary to explicitly set the local variable to NULL when it is no longer in use. References to these variables are automatically cleared as the method

Now, let's analyze it.1. Java SE (Java platform,standard Edition). Java SE was formerly known as J2SE. It allows you to develop and deploy Java applications that are used in desktops, servers, embedded environments, and live environments. Java SE contains classes that suppor

Memory layout of java objects (1): Calculate the memory space occupied by java objects and use of the java object layout tool I recently learned some knowledge about the memory layout of java objects. I want to know how much memory space a java object occupies and what the

1. Java SE (Java platform,standard Edition). Java SE was formerly known as J2SE. It allows you to develop and deploy Java applications that are used in desktops, servers, embedded environments, and live environments. Java SE contains classes that support

Java applications can be defined as collections of objects that communicate by invoking their own methods. Let's look specifically at what the class, object, method, entity variable means. Object: Object has state and behavior. For example: A dog has its state-color, name, variety, and behavior-wagging its tail, barking, eating. Object is an instance of the class.Class: A class can be defined as a template or blueprint that describes the behavior and

Reason Error: Java/lang/noclassdeffounderror:java/lang/objectOperating system environment: CentOS6.0 2.6.32-220.el6.x86_64JDK Version Environment: JDK1.5.0_22The operating system originally installed jdk1.6, and later developers asked the Java program to use the jdk1.5 version. Help Develop Download JDK1.5,After installing the JDK, this error occurs after setting the environment variable: The c

Recalling Java memoirs (1): Java 01 basic data types and statements, Java 01 Basic requirements for writing java programs 1. Writing a java class is actually writing a java file (by default, the class name and file name must be c

JAVA Learning (6): inheritance in JAVA and analysis of its common problems, java FAQsInheritance in JAVA and Analysis of Common Problems 1. Definitions inherited in JAVA In JAVA, classes are inherited throughExtend other classes

Rethinking java basics (2): Java reflection and java reflectionLet's take a look at Baidu's explanation: the JAVA reflection mechanism is in the running state. For any class, all attributes and methods of this class can be known. For any object, can call any of its methods and attributes. This kind of information obtai

you've been developing for a year or so, like using the Debug feature of Eclipse. Well, you now have the technical basis for reading the source code.I recommend starting with the JDK source code, which integrates directly with Eclipse and does not require any configuration.You can start with the JDK Toolkit, which is the Java version of data structures and algorithms that we learned, such as the list interface and ArrayList, LinkedList implementation

been developing for a year or so, like using the Debug feature of Eclipse. Well, you now have the technical basis for reading the source code.I recommend starting with the JDK source code, which integrates directly with Eclipse and does not require any configuration.You can start with the JDK Toolkit, which is the Java version of data structures and algorithms that we learned, such as the list interface and ArrayList, LinkedList implementations, Hash

Principle)The open and closed principle is to say to the expansion opening, to modify the closure . When the program needs to expand, can not modify the original code, to achieve a hot plug effect. So a nutshell is: In order to make the program good extensibility, easy to maintain and upgrade. To achieve this, we need to use interfaces and abstract classes, which we will refer to later in the specific design.2. The principle of substitution on the Ri