TestWhile

pom.xml

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+<?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>Testwhile</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.testwhile.Testwhile</exec.mainClass>
+    </properties>
+</project>

src/main/java/com/mycompany/testwhile/Testwhile.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ */
+
+package com.mycompany.testwhile;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author 250418
+ */
+public class Testwhile {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in); 
+        System.out.println("Introduza um número positivo"); 
+        int numero = scanner.nextInt(); 
+        while(numero < 0){ 
+        System.out.println("Introduza um número positivo"); 
+        numero = scanner.nextInt(); 
+    }
+  }
+}