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Java tutorial

A brief analysis of the usage skills of Split function in Java

For example, if you execute: "2|33|4".split("|"), the result will be: ""2334 It's strange, but you can still know the reason after reading the API description. The java.lang.string.split split method splits a Split the st

2024-11-20
Use java code to retain the number of decimal points

Copy the code as follows: import java.text.*; import java.math.*; public class Test{ public Test(){double a=saveNumber(15.12312312,6);S

2024-11-20
Implementation code for deleting elements in JAVA collections

Often we want to delete certain elements from a collection. Some may write this. Copy the code as follows: public void operate(List list){ for (Iterator it = list.iterator(); it.hasNext();) {

2024-11-20
Sharing the differences between the new keyword and newInstance method in Java

newInstance() uses the class loading mechanism, and new creates a new class. From a JVM perspective, when using new to create a class, the class may not be loaded. But when using the newInstance() method, you must ensure that the class is loaded and the c

2024-11-20
Generics in Java programming ideas implement a stack class sharing

I think the author's writing is so good that I have to save it. Understanding of this example: //Type parameters cannot use basic types. T and U are actually the same type. //Every time new data is placed, it becomes a new top. Push the original top d

2024-11-20
JAVA TIMER simple usage learning

Timer has two modes for executing tasks. The most commonly used is schedule, which can execute tasks in two ways: 1: at a certain time (Data), 2: after a fixed time (int delay). These two You can specify the frequency of task execution in any of the follo

2024-11-20
Specific implementation of java swing standard dialog box

Copy the code as follows: package test001;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButt

2024-11-20
About various permutation and combination Java algorithm implementation methods

1. Use the binary state method to find permutations and combinations. This method is relatively easy to understand, but its operation efficiency is not high. For small data permutations and combinations, you can use the copied code. The code is as follows

2024-11-20
Solution to the problem of installing jdk library on Alibaba Cloud host

Today we will continue to install jdk on the Alibaba Cloud service. You need to check whether Alibaba Cloud is 32-bit or 64-bit. If it is 32-bit, download the 32-bit package. If it is 64-bit, download the 64-bit package. Mine is 64-bit. , at first I didn’

2024-11-20
A small example of removing spaces, carriage returns, line feeds, and tabs from strings in Java

Copy the code as follows: import java.util.regex.Matcher;import java.util.regex.Pattern;/*** @author lei* 2011-9-2*/public class StringUt

2024-11-20
Specific examples of Java+MySql image data saving and reading

1. Create a table: Copy the code as follows: drop table if exists photo;CREATE TABLE photo (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,name VARCHAR(10

2024-11-20
Java image watermark example code

Copy the code as follows: try {String targetImg = "D:/Blue hills.jpg";// String pressImg = "D:/20130311220300.jpg"; String pressImg = "D:/

2024-11-20
Summary of using Eclipse shortcut keys

The most commonly used and practical 1. Alt + / is used as a content auxiliary prompt. It is estimated that no one uses it. Of course, it can also be used to do some quick input, such as System.out.println(), which is most used by beginners. Just enter sy

2024-11-20
Tomcat starts normally and reports 404 exception when accessing all pages. Summary and analysis of 404 exception.

404 exception is very common. Most of the cases are path errors, incorrect web.xml file mapping paths, server settings, servlet jar packages that are not imported or not released with the project, etc. If the path is wrong, careful inspection can solve th

2024-11-20
In-depth analysis of the differences between StringBuffer and StringBuilder

String and StringBuilder are often used in projects. String can be spliced with "+", and StringBuilder can be spliced with append. I have never understood why I should use StringBuilder since I can use String. Although working on database

2024-11-20

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