Test Fichero

.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>HolaFichero</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/Package/HolaFichero.java

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+package Package;
+import java.io.File;
+import java.io.IOException;
+public class HolaFichero {
+  
+  static char Sistema;
+  
+  public static void main(String args[]) {
+    char Sistema=MiSistema();
+    System.out.println(Sistema);
+    
+  }
+  
+  static char MiSistema() {
+    char Sis='?';
+    char Windows='W';
+    char Linux='L';
+    System.out.println("Creando mi primer fichero ...");    
+    String so = System.getProperty("os.name"); 
+    System.out.print("El sistema operativo es: ");
+    if (so.charAt(0)==Windows) {
+      System.out.print("Windows -> ");
+      Sis=Windows;
+    }
+    else {
+      System.out.print("Linux -> ");
+      Sis=Linux;
+    }
+    return Sis;
+  }
+  
+  public void CreoFicheroWindows() throws IOException {
+    System.out.println("Creando fichero en Windows ...");
+    File fwindows = new File("C:\\Users\\Ivan\\Documents\\CreoFicheroWindows.txt");
+    if (!fwindows.exists()) {
+      fwindows.createNewFile();
+        }
+    System.out.println("Fichero creado en Windows.");
+  }
+  
+  public void CreoFicheroLinux() throws IOException {
+    System.out.println("Creando fichero en Linux ...");
+    File funix = new File("/home/..../CreoFicheroUnix.txt");
+    if (!funix.exists()) {
+      funix.createNewFile();
+        }
+    System.out.println("Fichero creado en Unix.");
+  }
+}

src/module-info.java

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+/**
+ * 
+ */
+/**
+ * @author Ivan
+ *
+ */
+module HolaFichero {
+}