Java Tutorials

JAVA-Little knowledge 1. The difference between int and integer Integer is the wrapper class for int, and int is a basic data type of Java An integer variable must be instantiated before it can be used, and the int variable does not need

# # #面向对象 (Inheritance) # # # 1. Concept of inheritance: inheritance is a relationship between classes and classes, and is a relationship of "is a" Parent class---> base class Subclass---> Derived class Note: Inheritance in Java is

MD5 Tool Class Using the JDK to encapsulate a simple MD5 tool class, the logic is relatively simple, directly attached to the specific implementation public static string GetMD5 (string content) { string result = ""; try {

In-depth understanding of class loading mechanisms Description Before starting the text, I would like to say the purpose and benefits of writing these articles, mainly can make their own learning things to do a summary, sometimes spend a long

Spring Boot 2.x has been released for a long time, and now spring Cloud has released the Finchley version based on spring boot 2.x, and now it's time to do an overall framework upgrade for the project. Pre-upgrade = + After upgrade Spring Boot

Method One: Implement the package Test;import Java.io.file;import java.io.filewriter;import through an array java.io.ioexception;import Java.util.arraylist;import Java.util.list;import Java.util.random;public class ListData {public static void main (

1 File class   FileThe name of the (document) class is somewhat misleading; we may think that it refers to a document, but it is not. It can represent both the name of a particular file and the name of a group of files under a directory. In

Recently used to record a self-written demo Using the @xmlrootelement annotation on the root element, name is the element name child element attributes use @xmlelement,name as the element name If there are attributes, such as Xml:

Type wildcard character Type wildcard characters are generally used instead of specific type arguments ( Here are type arguments, not type parameters ). When you do not need to use the type's specific functionality when manipulating types, you can

Operation Symbols:1), arithmetic operator.+-*/% : the remainder of any integer is not 0 or 1, so the switching operation can be achieved as long as the remainder is changed.+: Connector.++,--2), assignment operator.=  += -= *= /= %=3), comparison

Learn to program the Java tutorial on programming it Tutorial collection framework released, welcome to visit via Xuebiancheng8.comThe collection framework in Java Name Incredibles is the framework for the collection. So what is a collection, which

Learn to program the Java Tutorial package released, you are welcome to visit through the xuebiancheng8.comThe following is an analysis of the encapsulation in object-oriented, and what is encapsulation. First, segment code.public class

Original http://go-learning.com/2012/05/22/java-gettingstart-0/ The intended audience of this course is a basic Java platform.ProgramMember. I don't have any Java programming experience, nor any programming experience. Of course, basic computer

From http://www.cnblogs.com/ggjucheng/archive/2012/12/16/2820839.html English from http://docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html UnlikeIf-then andIf-then-else statement, the switch statement can have multiple possible

From http://www.cnblogs.com/ggjucheng/archive/2012/12/16/2820841.html English from http://docs.oracle.com/javase/tutorial/java/nutsandbolts/while.html The while statement continuously executes the statement in the block when the specific

From http://www.cnblogs.com/ggjucheng/archive/2012/12/08/2809371.html English from http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html JavaProgramming LanguageIs a static type, which indicates that the variable must be

Break statement The break statement has two forms: Label and non-label. In the previous switch statement, the break statement is not in the label format. You can use non-label break to end the for, while, do-while loop, as shown in the following

From http://www.cnblogs.com/ggjucheng/archive/2012/11/26/2789749.html You can declare some methods of the class as final. Use the final keyword to declare the method, indicating that this method cannot be overwritten by the quilt class.The object

From http://www.cnblogs.com/ggjucheng/archive/2012/11/26/2789638.html Polymorphism, defined in the dictionary, refers to the fact that organisms or species in biology can have many different forms or stages. This principle also applies to

From http://www.cnblogs.com/ggjucheng/archive/2012/11/25/2788247.html Inheritance In Java, classes can inherit from other classes and inherit the members and methods of the parent class. Inheritance is simple but powerful: When you need to