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POPrinting string array also prints null
 

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  1. POPrinting string array also prints null
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    <p>When I am printing contents of a string array the output is printing 'null' as well. I am not sure what's wrong with this. Here is the output, what I expect is the output without 'null'</p> <pre><code>null(wa?&gt;=0)nullnull*(wo?&gt;=0)nullnull*(4*wa?+7*wo?&gt;=50)nullnull*(d1=10)nullnull*((d2=1)+(k=2))nullnull </code></pre> <p>Thanks and appreciate your help. I would say my skill in Java in beginner level and I started two weeks back.</p> <p>Here is the actual code:</p> <pre><code> String[] arrStr = new String[50]; int countStr = 0; for (int i = 0; i &lt; para.length; i++) { if (para[i] == '(') { count = count + 1; } if (para[i] == ')') { count = count - 1; } if (count &gt; 0) { arrStr[countStr] = arrStr[countStr] + para[i]; } else { if (para[i] == ')') { arrStr[countStr] = arrStr[countStr] + para[i]; countStr += 1; } else { countStr += 1; arrStr[countStr] = arrStr[countStr] + para[i]; // System.out.println(para[i]); } } } System.out.println(countStr); for (int i = 0; i &lt; countStr; i++) { System.out.print(arrStr[i]); } </code></pre> <p>Before this part, I am reading the following string from a word document:</p> <pre><code>(wa?&gt;=0)AND(wo?&gt;=0)AND(4*wa?+7*wo?&gt;=50)AND(d1=10)AND((d2=1)+(k=2)) </code></pre> <p>I think the problem may be due to the line: </p> <pre><code>arrStr[countStr] = arrStr[countStr] + para[i]; </code></pre> <p>Since <code>arrStr[countStr]</code> is null initially and I add an element to it, it saves it as <code>null+para[i]</code>. Do you think it is possible? </p> <p>Like when I try: <code>System.out.println(arrStr[0]);</code> I get the output as </p> <pre><code>null(wa?&gt;=0) </code></pre>
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    1. USAndrea Ligios
    1. USuser1596115
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    1. COIf you need help debugging your code, the actual code would help.
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      1. POPrinting string array also prints null
      1. USJoachim Isaksson
    2. COCan you please show the code that's causing the error?
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      1. POPrinting string array also prints null
      1. USSteWoo
    3. COAfter every assignment opeartion done on the array, print out the value that you have assigned. It will give you a better picture of where the value is being set as null. If you can provide th entire code, it would be easier to point out where the problem is.
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      1. USAdarsh
 

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