feat(chapter to 4): added

src/tutorialJava/capitulo4_Arrays/Ej04_ComoHacerEjerciciosMatrices.java

@@ -0,0 +1,84 @@
+package tutorialJava.capitulo4_Arrays;
+
+import java.util.Iterator;
+
+import tutorialJava.Utils;
+
+public class Ej04_ComoHacerEjerciciosMatrices {
+
+	/**
+	 * 
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		int m[][] = new int[][] { 	{1, 	2, 		3, 		4, 		0}, 
+									{5, 	6, 		0, 		8, 		9}, 
+									{10,	0, 		12, 	13, 	14}, 
+									{0, 	16,		17, 	18, 	19}, 
+									{20, 	21, 	22, 	0, 		24} };
+									
+//		inicializaMatrizAlAzar(m);
+		imprimeMatriz(m);
+		System.out.println("Es positiva: " + esMatrizPositiva(m));
+	}
+	
+
+	/**
+	 * 
+	 * @param m
+	 */
+	public static void inicializaMatrizAlAzar(int m[][]) {
+		for (int i = 0; i < m.length; i++) {
+			for (int j = 0; j < m[i].length; j++) {
+				m[i][j] = (int) Math.round(Math.random() * 100);
+			}
+		}
+	}
+	
+	/**
+	 * 
+	 * @param m
+	 */
+	public static void imprimeMatriz(int m[][]) {
+		for (int i = 0; i < m.length; i++) {
+			for (int j = 0; j < m[i].length; j++) {
+				System.out.print(m[i][j] + "\t");
+			}
+			System.out.println();
+		}
+	}
+	
+	
+	/**
+	 * 
+	 * @param m
+	 * @return
+	 */
+	public static boolean esMatrizPositiva(int m[][]) {
+		for (int i = 0; i < m.length; i++) {
+			for (int j = 0; j < m[i].length; j++) {
+				if (m[i][j] < 0) {
+					return false;
+				}
+			}
+		}
+		return true;
+	}
+}
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