adicionei comentarios

pom.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.mycompany</groupId>
+    <artifactId>mavenproject18</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.release>24</maven.compiler.release>
+        <exec.mainClass>com.mycompany.mavenproject18.Mavenproject18</exec.mainClass>
+    </properties>
+</project>

src/main/java/com/mycompany/mavenproject18/Mavenproject18.java

@@ -0,0 +1,26 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ */
+
+package com.mycompany.mavenproject18;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author 250407
+ */
+public class Mavenproject18 {
+
+    public static void main(String[] args) {
+    Scanner scanner = new Scanner(System.in); 
+    System.out.println("introduza um numero positivo"); 
+    int numero = scanner.nextInt(); 
+    while(numero < 0){ 
+    System.out.println("introduza um numero positivo"); 
+    
+    numero = scanner. nextInt(); 
+ 
+        } 
+     }
+  }