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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.
How to export Excel with Java and add drop-down box optionsFor 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
How to generate multiple random numbers in java at once1. 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
How to implement empty judgment in Java1. 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
How to implement prefix tree in Java1. 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,
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