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    <pre><code>else if (x &lt;= b.length &amp;&amp; y &lt;= b[x].length &amp;&amp; x &lt;= a.length &amp;&amp; y &lt;= a[x].length) { merged[x][y] = ((a[x][y] + b[x][y]) /2); // &lt;= problematic line } </code></pre> <p>in this line you try to reach a point where it's out of a's bound. In my example, i set a to be <code>(10, 10)</code> and b to be <code>(5, 20)</code>. It crashed when <code>x = 0, y = 10</code>. Now, as you can see <code>a[0][10]</code> is out of bounds. </p> <p>Here is my trial code and it's output:</p> <pre><code>else if (x &lt;= b.length &amp;&amp; y &lt;= b[x].length &amp;&amp; x &lt;= a.length &amp;&amp; y &lt;= a[x].length) { System.out.println("x = " + x + " y = " + y); System.out.println("merged.length = " + merged.length); System.out.println("merged[0].length = " + merged[0].length); System.out.println("a.length = " + a.length); System.out.println("a[0].length = " + a[0].length); System.out.println("b.length = " + b.length); System.out.println("b[0].length = " + b[0].length); System.out.println(); System.out.println(); merged[x][y] = ((a[x][y] + b[x][y]) /2); } </code></pre> <p>Output:</p> <pre><code>x = 0 y = 10 merged.length = 10 merged[0].length = 20 a.length = 10 a[0].length = 10 b.length = 5 b[0].length = 20 </code></pre> <p>EDIT: Just noticed solution I proposed is not applicable for you.</p> <p>EDIT2: <code>x &lt;= a.length</code> and <code>y &lt;= a[x].length</code> kind of statements needs to be changed into <code>x &lt; a.length</code> and <code>y &lt; a[x].length</code> or <code>x &lt;= a.length - 1</code> and <code>y &lt;= a[x].length - 1</code></p>
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    1. POMerging 2 Images Using 2D Arrays as Pixels
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    1. USCengiz Kandemir
    1. USCengiz Kandemir
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    1. COStill returning out of bounds, here is the revised code.
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    2. COif (x <= a.length-1 && y <= a[x].length-1 && x > b.length && y > b[x].length) { merged[x][y] = a[x][y]; } else if (x <= b.length-1 && y <= b[x].length-1 && x > a.length && y > a[x].length) { merged[x][y] = b[x][y]; } else if (x <= b.length-1 && y <= b[x].length-1 && x <= a.length-1 && y <= a[x].length-1) { merged[x][y] = ((a[x][y] + b[x][y]) /2); } else { merged[x][y] = 127; }
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    3. COthen, you need to revisit your if statements because they allow out of bound values for a and b.
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      1. USCengiz Kandemir
 

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