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copied!<p>Your variable final23 is never initialized. In java you have to initialize an array before using it. Either you do it during the declaration (like you did with k and l) or you have to do it later with a new <code>arrayType[arraySize];</code></p> <hr> <p>Here are the way an array can be declared/initialized.</p> <pre><code>int[] iArray = {1, 2, 3}; //Declaration, Initialization, set values int[] iArray; //Declaration iArray = new int[3]; //Initialization iArray[0] = 1; //Set value int[] iArray; //Declaration iArray = new Array[3]{1, 2, 3}; // Initialization and set values </code></pre> <p>You can of course for the two last sample put the initialization on the same line that the declaration.</p> <hr> <p>Try this (cleaned) code :</p> <pre><code>public class test1 { int[] final23; public int[] sum(int[] x, int[] y) { final23 = new int[Math.min(x.length, y.length)]; for (int i = 0; i < final23.length; i++) { final23[i] = x[i] + y[i]; } return final23; } public void print() { for (int aFinal23 : final23) { System.out.println(aFinal23); } } public static void main(String[] args) { int l[] = {4, 7, 2}; int k[] = {4, 6, 2}; test1 x = new test1(); x.sum(k, l); x.print(); } } </code></pre> <hr> <p><strong>Resources :</strong></p> <ul> <li><a href="http://download.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html" rel="nofollow noreferrer">Oracle.com - Arrays</a></li> <li><a href="http://java.sun.com/docs/books/jls/second_edition/html/arrays.doc.html#11358" rel="nofollow noreferrer">JLS - Array Initializers</a></li> <li><a href="http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#46168" rel="nofollow noreferrer">JLS - Array Creation Expressions</a></li> </ul>

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