Project Finished

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>tree-cmd-java</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.core.resources.prefs

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+eclipse.preferences.version=1
+encoding/<project>=UTF-8

.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=17
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=17

src/com/jesuspinar/main/Main.java

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+package com.jesuspinar.main;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+
+	public static void main(String[] args) {
+		File folder = new File(".");
+	    StringBuilder sb = renderFolder(folder);
+	    System.out.println(sb.toString());
+	}
+	
+	private static StringBuilder renderFolder(File folder) {
+	    return renderFolder(folder, 0, new StringBuilder(), false, new ArrayList<>());
+	}
+
+	private static StringBuilder renderFolder(File folder, int level, StringBuilder sb,
+			boolean isLast, List<Boolean> hierarchyTree) {
+		
+	    indent(sb, level, isLast, hierarchyTree).append(folder.getName()).append("\n");
+
+	    File[] objects = folder.listFiles((FilenameFilter) new FilenameFilter() {
+	        @Override
+	        public boolean accept(File current, String name) {
+	            return new File(current, name).isDirectory();
+	        }
+	    });
+
+	    for (int i = 0; i < objects.length; i++) {
+	        boolean last = ((i + 1) == objects.length);
+
+	        // esto significa que la carpeta actual todavía tendrá que imprimir sub 
+	        //carpetas a este nivel, entonces necesitamos continuar imprimiendo |
+	        hierarchyTree.add(i != objects.length - 1);
+	        renderFolder(objects[i], level + 1, sb, last, hierarchyTree);
+
+	        // hace saltar el último valor al volver de un nivel inferior a un nivel superior
+	        hierarchyTree.remove(hierarchyTree.size() - 1);
+	    }
+	    return sb;
+	}
+ 
+	private static StringBuilder indent(StringBuilder sb, int level, 
+			boolean isLast, List<Boolean> hierarchyTree) {
+	    
+		String indentContent = "\u2502   ";
+	    for (int i = 0; i < hierarchyTree.size() - 1; ++i) {
+	    	// determina si necesitamos imprimir | en este nivel para mostrar la estructura del árbol
+	        // es decir, si esta carpeta tiene una carpeta hermana que se va a imprimir más tarde
+	        if (hierarchyTree.get(i)) {
+	            sb.append(indentContent);
+	        } else {
+	            sb.append("    ");
+	        }
+	    }
+
+	    if (level > 0) {
+	        sb.append(isLast
+	                ? "\u2514\u2500\u2500"
+	                : "\u251c\u2500\u2500").append(" ");
+	    }
+
+	    return sb;
+	}
+    
+}