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feat: 重构目录
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‎README.md‎

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- [Java 日期时间 Date](https://www.wdbyte.com/java/date/)
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- [Java 异常处理](https://www.wdbyte.com/java/exception/)
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- [Java 枚举](https://www.wdbyte.com/java/enum/)
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- [Java 注释](https://www.wdbyte.com/java/comment/)
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- [Java 集合框架](https://www.wdbyte.com/java/collection/)
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## Java 进阶

‎core-java-modules/core-java-20/.gitignore‎

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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### IntelliJ IDEA ###
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.idea/modules.xml
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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*.iml
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*.ipr
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store

‎core-java-modules/core-java-20/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>core-java-modules</artifactId>
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<groupId>com.wdbyte.core-java-modules</groupId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.wdbyte.jdk20</groupId>
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<artifactId>core-java-20</artifactId>
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<properties>
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<maven.compiler.source>20</maven.compiler.source>
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<maven.compiler.target>20</maven.compiler.target>
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</properties>
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</project>

‎core-java-modules/core-java-20/src/main/java/JEP431Test.java‎

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import java.util.ArrayDeque;
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import java.util.ArrayList;
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import java.util.Deque;
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import java.util.LinkedHashMap;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.TreeSet;
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/**
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* JDK 21 之前，顺序集合中操作体验不一致
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* @author niulang
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* @date 2023/10/12ø
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*/
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public class JEP431Test {
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public static void main(String[] args) {
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// JDK 21 之前，顺序集合中操作体验不一致
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List<Integer> listTemp = List.of(1, 2, 3, 4, 5);
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ArrayList<Integer> list = new ArrayList(listTemp);
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Deque<Integer> deque = new ArrayDeque<>(listTemp);
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LinkedHashSet<Integer> linkedHashSet = new LinkedHashSet<>(listTemp);
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TreeSet<Integer> sortedSet = new TreeSet<>(listTemp);
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LinkedHashMap<Integer, Integer> linkedHashMap = new LinkedHashMap<>();
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for (int i = 1; i <= 5; i++) {
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linkedHashMap.put(i, i);
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}
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// 输出第一个元素
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System.out.println(list.get(0));
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System.out.println(deque.getFirst());
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System.out.println(linkedHashSet.iterator().next());
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System.out.println(sortedSet.first());
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//System.out.println(linkedHashMap.firstEntry());没办法
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System.out.println("-----------------------");
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// 输出最后一个元素
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System.out.println(list.get(list.size()-1));
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System.out.println(deque.getLast());
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//System.out.println(linkedHashSet()); 没办法，只能遍历
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System.out.println(sortedSet.last());
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//System.out.println(linkedHashMap); 没办法
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System.out.println("-----------------------");
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// 逆序遍历
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for (var it = list.listIterator(list.size()); it.hasPrevious();) {
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var e = it.previous();
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System.out.print(e);
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}
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System.out.println();
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for (var it = deque.descendingIterator(); it.hasNext();) {
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var e = it.next();
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System.out.print(e);
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}
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System.out.println();
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for (Integer i : sortedSet.descendingSet()) {
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System.out.print(i);
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}
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System.out.println();
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// sortedSet linkedHashMap 逆序输出很难操作
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}
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}

core-java-modules/core-java-20/src/JEP433SwitchTest.java renamed to core-java-modules/core-java-20/src/main/java/JEP433SwitchTest.java

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core-java-modules/core-java-20/src/Jep429ScopedValueTest.java renamed to core-java-modules/core-java-20/src/main/java/Jep429ScopedValueTest.java

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core-java-modules/core-java-20/src/Jep432RecordAndInstance.java renamed to core-java-modules/core-java-20/src/main/java/Jep432RecordAndInstance.java

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core-java-modules/core-java-20/src/RecordTest.java renamed to core-java-modules/core-java-20/src/main/java/RecordTest.java

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‎core-java-modules/core-java-io/src/main/java/com/wdbyte/io/image/GeneratorTextImageMini.java‎

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package com.wdbyte.io.image;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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/**
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* <p>
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* 根据图片生成字符图案
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* 1.图片大小缩放
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* 2.遍历图片像素点
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* 3.获取图片像素点亮度
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* 4.匹配字符
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* 5.输出图案
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*
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* @website https://www.wdbyte.com
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*/
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public class GeneratorTextImageMini {
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public static void main(String[] args) throws Exception {
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//BufferedImage image = resizeImage("/Users/darcy/Downloads/sanli.jpg", 120);
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BufferedImage image = ImageIO.read(new File("/Users/darcy/Downloads/刘看山.jpg"));
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printImage(image);
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}
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/**
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* 图片缩放
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*
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* @param srcImagePath 图片路径
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* @param targetWidth 目标宽度
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* @return
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* @throws IOException
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*/
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public static BufferedImage resizeImage(String srcImagePath, int targetWidth) throws IOException {
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Image srcImage = ImageIO.read(new File(srcImagePath));
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int targetHeight = getTargetHeight(targetWidth, srcImage);
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BufferedImage resizedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
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Graphics2D graphics2D = resizedImage.createGraphics();
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graphics2D.drawImage(srcImage, 0, 0, targetWidth, targetHeight, null);
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graphics2D.dispose();
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return resizedImage;
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}
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/**
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* 根据指定宽度，计算等比例高度
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*
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* @param targetWidth 目标宽度
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* @param srcImage 图片信息
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* @return
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*/
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private static int getTargetHeight(int targetWidth, Image srcImage) {
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int targetHeight = srcImage.getHeight(null);
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if (targetWidth < srcImage.getWidth(null)) {
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targetHeight = Math.round((float)targetHeight / ((float)srcImage.getWidth(null) / (float)targetWidth));
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}
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return targetHeight;
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}
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/**
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* 图片打印
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*
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* @param image
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* @throws IOException
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*/
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public static void printImage(BufferedImage image) throws IOException {
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final char[] PIXEL_CHAR_ARRAY = {'W', '@', '#', '8', '&', '*', 'o', ':', '.', ' '};
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//final char[] PIXEL_CHAR_ARRAY = {'，', '.', ' '};
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int width = image.getWidth();
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int height = image.getHeight();
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for (int i = 0; i < height; i++) {
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for (int j = 0; j < width; j++) {
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int rgb = image.getRGB(j, i);
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Color color = new Color(rgb);
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int red = color.getRed();
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int green = color.getGreen();
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int blue = color.getBlue();
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// 一个用于计算RGB像素点灰度的公式
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Double grayscale = 0.2126 * red + 0.7152 * green + 0.0722 * blue;
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double index = grayscale / (Math.ceil(255 / PIXEL_CHAR_ARRAY.length) + 0.5);
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System.out.print(PIXEL_CHAR_ARRAY[(int)(Math.floor(index))]);
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}
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System.out.println();
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}
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}
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}

‎core-java-modules/core-java-io/target/classes/bingdundun.jpeg‎

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