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    <p>You are having only four lines that deals with your <code>CallManager</code> class:</p> <pre><code>CallManager clm = new CallManager(); clm.setOperatorName("Banglalink"); System.out.println(clm.internalPreString); System.out.println(clm.preString); </code></pre> <p>The reason why you are getting null :</p> <ol> <li>You are using a default constructor right and there processing is done in it. So this is not a problem</li> <li><p>Now on next line you call <code>setOperator</code> method which has this code:</p> <pre><code>public void setOperatorName( String getMeFromPreferences) { operatorName = getMeFromPreferences; System.out.println("I got it " + operatorName); } </code></pre> <p>Now here you are only setting thw variable <code>operatorName</code> and nothing else. So all other variables are null as you not doing any processing or something that will initialize them to something.</p></li> <li><p>So when you print <code>clm.internalPreString</code> and <code>clm.preString</code> you get null as they are not initialized. But try printing <code>clm.operatorName</code> and it will print the operator name that you passed and was initialzed inside your method <code>setOperatorName</code>.</p></li> </ol> <p>So as you have defined so many method inside your class, use them so that all the variables are set as per your logic</p> <p><strong>UPDATE</strong></p> <pre><code>public void setOperatorName( String getMeFromPreferences) { operatorName = getMeFromPreferences; //call any methods for example and use the values returned from the method by storing it inside a variable String mystring = getOperatorBasedPreString(String operatorName) } </code></pre>
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    1. COafter setting an operator name wont it retrieve internalDigit size and inetrnalPrestring from getOperatorBasedInternalDigit( String operatorName) and getOperatorBasedPreString(String operatorName) ? would you clear me that?
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    2. CONo you need to call those methods inside `setOperatorName` method or somewhere, it won't call it automatically
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    3. COhow to call these methods inside the method? any suggestion?
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