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  1. PO
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    <p>There are two problems with your code. First, when <code>j == size - 1</code> (the last iteration), you are calling list.get(j+1), which is what is causing the exception. Just change your loop condition to <code>j &lt; size - 1</code> and the exception should go away. (Alternatively, start at <code>j = 1</code> and compare to the previous element.)</p> <p>Second, you are only comparing each element with its immediate successor element. From your description, it doesn't sound like that's what you want to do.</p> <p>I'd suggest capturing the logic of comparison in a separate method. It might be part of <code>MyClass</code>:</p> <pre><code>class MyClass { String str; Integer intgr; /** * Returns the relationship between this and another MyClass instance. * The relationship can be one of three values: * &lt;pre&gt; * -1 - This object should be discarded and other kept * 0 - There is no relationship between this and other * 1 - This object should be kept and other discarded * &lt;/pre&gt; * * @param other The other instance to evaluate * * @return 0 if there is no relationship. */ public int relationTo(MyClass other) { final String myPrefix = str.substring(0, str.length() - 1); final String otherPrefix = other.str.substring(0, other.str.length() - 1); if (myPrefix.equals(otherPrefix)) { return intgr &lt; other.intgr ? -1 : 1; } else { return 0; } } } </code></pre> <p>(This can easily be transformed into a method with two arguments that would be outside <code>MyClass</code>.) Then you can use the method to decide what to keep. You need to do a double iteration to find non-adjacent objects:</p> <pre><code>int size = list.size(); for (int i = 0; i &lt; size; ++i) { final MyClass current = list.get(i); for (int j = 0; j &lt; i; ++j) { final MyClass previous = list.get(j); final int relation = previous.relationTo(current); if (relation &lt; 0) { // remove previous (at index j) list.remove(j); --i; --j; --size; } else if (relation &gt; 0) { // remove current (at index i) list.remove(i); --i; --size; break; // exit inner loop } // else current and previous don't share a prefix } } </code></pre>
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    1. POHow to remove Duplicate objects from Java ArrayList?
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    1. COthanks for your answer! but wonder why I'm getting the one having samller value in intgr from the matching strings rather than the larger one that I need!
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    2. CO@divine - It's because I screwed up the logic in my last code block of what to remove based on the relationship between `current` and `previous`. I updated my answer to something that (I hope) now works.
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    3. COthanks! this works like a charm!
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