Java

First of all, the current understanding of the Java curriculum as my first blog in the blog Park, now plan to take the basic content of the course to study carefully in the class after school through the network to learn and supplement, the

If you have multiple parameters in a class's constructor or static factory, the builder mode is a good choice when designing this class, especially if most of the parameters are optional.Client code using the builder pattern is easier to read and

Just now, I had a little piece of Java to ask me about three kinds of object-oriented features, I gave him a simple explanation, the following is my ten years of Java object-oriented features of the simple description:PackagingEncapsulation is to

1) The Subclass object reference is transformed into a reference to the parent class, called upward transformation. According to the current understanding, an important role of upward transformation is to facilitate the implementation of

1 PackageCom.xia;2 ImportJava.io.*;3 Public classTest2 {4 5 Public Static voidMain (string[] args) {6 7 //output Stream8 9 Try {TenFileOutputStream fos =NewFileOutputStream ("D:\\213.txt",true);//true to allow

Response.sendredirect ("http://www.foo.com/path/error.html");Redirection and forwarding have an important difference: When forwarding is used, the JSP container uses an internal method to invoke the target page, and the new page continues to process

Summary of learning contents of textbookThe knowledge learned in this chapter has been studied in the previous C language. So learn to be more relaxed. It is mainly about the types and operators of data and variables, and the knowledge points of

1, the JButton size of the setting button.setpreferredsize (New Dimension (30,30)); //(30,30) is the size of the button you want to set 2. Transparent setting for JButtonbutton.setcontentareafilled (false);3. Set the border of the button to remove

This article simulates the actual memory overflow exception through several pieces of code.The code in this article is based on the Oracle company's hotspot virtual machine.1. Java Heap Overflow 1.1 simulation scenarioThe Java heap is used to store

In the previous section, the memory overflow location in Java and the solution for the Java Virtual machine stack and the method area of memory anomalies and processing methods are resolved, because the Java Virtual Machine management of the heap is

Type Erase code fragment oneNew arraylistnew arraylist= = C2); /* outputtrue */Obviously in the normal use, ArrayList() and new ArrayList() is completely different types, but here, the program does indeed output true .This is caused by the type

public class Shuixianhua {public static void Main (string[] args) {for (int i=100;iint x, y, Z;x=i/100;y= (i-x*100)/10;z=i-x*100-y*10;if (i==x*x*x+y*y*y+z*z*z){System.out.println (i);}}}}public class Qiuhe {public static void Main (string[] args)

Concept : The singleton pattern in Java is a common pattern, there are several types of single-case pattern, there are three kinds: lazy mode, a hungry man mode and registration mode.The characteristics of the singleton mode: 1, the Singleton class

From last semester to now has studied a semester of Java, let me realize that the road of software development is full of thorns and challenges of the road, but also full of hope. Java learning is the same, there is no shortcut to go. Dream like

Java and design patterns-adapter patterns The adapter mode is often used in development. The various adapters frequently used in Android development belong to the adapter mode, and the adapter mode is also used when connecting to various databases.

In generics? Super T and? The difference between extends T and superextends List , Set statement mean? indicates the parent class of any T including T. represents any T subclass, including T. The following describes the differences between the

Log problems at work, backup of existing logs, and log backup The problem arises for some reason. The white point is what the customer needs and there is no way to do it. However, it also brings us a lot of trouble. I also hope that you can give me

Spring notes-a simple example of using spring API to implement AOP, springapiaop Another important idea of Spring is AOP, which provides a mechanism to execute additional code before and after running the business, the Filter in Servlet is an

Regular Expression ----------- match date and time, regular expression match date   Regular Expression matches the date and time   Regular Expression (? N: ^ (? = \ D )((? 31 (?! (. 0? [1, 2469] | 11) | 30 (?!. 0? 2) | 29 (? (. 0? 2 )(? =. {3, 4} (1

Java Virtual Machine class loading mechanism When I see this question, many people will think that I write my java code. As for classes, how can JVM load them? This is also true for a long time. With the increasing programming experience, I feel