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PO
primarykey
Id
3688289
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
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CreationDate
2010-09-10T20:57:44.537
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0
LastActivityDate
2010-09-10T21:04:26.140
LastEditDate
2010-09-10T21:04:26.140
LastEditorUserId
422597
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422597
ParentId
3688258
PostTypeId
2
Score
5
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0
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text
Body
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> <hr> Here are the way an array can be declared/initialized. <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> You can of course for the two last sample put the initialization on the same line that the declaration. <hr> Try this (cleaned) code : <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> Resources : <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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1. USColin Hebert
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