Home

How to extract audio from video in java

How to extract audio from video in Java: 1. Add the corresponding dependency to the spring boot project pom file; 2. Java single-class implementation code, copy it to the Spring boot project; 3. Run the result. If you want to know more about java, you can read the articles below this topic.

129

java Extract audio excel set json database

Table of Contents

How to extract audio from video in java

Extraction method: 1. Add the corresponding dependencies to the spring boot project pom file; 2. Copy the Java single-class implementation code to the Spring boot project; 3. Run the results.

Mar 05, 2024 pm 05:11 PM

java Extract audio

How to export Excel with Java and add drop-down box options

For drop-down boxes with many options in Excel, you need to use a hidden workbook to solve the problem. Use function values to make options with fewer options (generally less than 5): privatestaticDataValidationsetFewDataValidation(Sheetsheet,String[]textList,intfirstRow,intendRow,intfirstCol, intendCol){DataValidationHelperhelper=sheet.getDataValidationHelper();//Load the drop-down list content DataVali

May 14, 2023 pm 04:40 PM

excel java

How to generate multiple random numbers in java at once

1. Create a list collection and Random object. Write a while loop to put the randomly generated random number in the set (before putting it in, you need to judge whether the generated random number exists in the set, if it exists, give up, if it does not exist, put it in the set) importjava.util.ArrayList ;importjava.util.Arrays;importjava.util.List;importjava.util.Random;publicclassTest{publicstaticvoidmain(String[]args){//Calling the function, this time the requirement is: Generate

May 14, 2023 pm 05:01 PM

java

How to implement empty judgment in Java

1. Introduction In actual projects, we will have many places where null verification is required. If null verification is not performed, NullPointerException may occur. Let’s first take a look at some of the empty judgment methods in actual projects if (ObjectUtil.isNotNull(vo.getSubmitterId())){userIds.add(vo.getSubmitterId());}if(StringUtils.isNotBlank(vo.getBudgetPM())) {userIds.add(Long.valueOf(vo.getBudgetPM()));}if(C

May 13, 2023 pm 04:34 PM

java

How to implement prefix tree in Java

1. Prefix tree 1. What is a prefix tree? A dictionary tree (Trie tree) is a tree-shaped data structure that is often used for the storage and search of strings. The core idea of the dictionary tree is to use common prefixes between strings to save storage space and improve query efficiency. It is a multi-tree, each node represents the prefix of a string, and the path from the root node to the leaf node constitutes a string. The root node of the dictionary tree does not contain characters. Each child node represents a character. The characters on the path from the root node to any node are connected to the string represented by the node. Each node can store one or more strings, usually using a flag to mark whether the string represented by a node exists. When you need to find a string in a set of strings,

May 13, 2023 pm 02:43 PM

java

How to use garbage collector in Java

Tips for using the Java garbage collector. The garbage collector (GarbageCollector, GC) is an important part of modern software virtual machine technology. Its design has a great impact on the performance of applications running on the virtual machine. Both Java Virtual Machine (JVM) and .netframework provide this functionality. Below we briefly introduce the principles of the garbage collector in the Java virtual machine. Java's memory management is actually the management of objects, including the allocation and release of objects. For programmers, allocate objects using the new keyword; when releasing an object, just assign all references to the object to null. For GC, when the programmer creates an object, the GC starts to monitor this pair

May 13, 2023 pm 03:40 PM

java

How to use Set interface in Java to store arrays without duplicate elements

Set interface The Set interface is the same as the List interface, and inherits the Collection interface. The elements in the Set interface are unordered, and certain rules are used to ensure that the stored elements are not repeated. HashSet collection HashSet is an implementation class of the Set interface. The stored elements are non-repeatable and the elements are unordered. When adding an object to the HashSet collection, the hashCode() method of the object will first be called to calculate The hash value of the object, thereby determining where the element is stored. If the hash values are the same at this time, call the equals() method of the object to ensure that there are no duplicate elements at this position. package collection class;importjava.util.H

May 13, 2023 pm 07:34 PM

java set

How does Java call the interface to obtain json data and save it to the database after parsing it?

Java calls the interface to obtain json data and save it to the database 1. Configure the self-defined interface URL in the yml file //Self-defined JSON interface URL blacklist_data_url: Interface URL 2. Add the request method and path in the Controller /***@Title: Query* @Description: Query vehicle records *@Author: Half degree * @Date: 2022/9/2717:33*/@GetMapping("/Blacklist")publicvoidselectBlacklist(){booleana=imB

May 14, 2023 am 10:58 AM

java json database