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src/main/java/com/mycompany/whiles/Whiles.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ */
+
+package com.mycompany.whiles;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author 250419
+ */
+public class Whiles {
+
+    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(); 
+
+} 
+    }
+}