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POAdding array of JRadioButtons with variable length to a JWindow
 

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    <p>Hello everyone I was trying to add an array of variable length to a JWindow but I am getting a run time error. Want help from here ..</p> <p>Here is my code : </p> <pre><code> package components; import java.util.Calendar; public class FullDay extends javax.swing.JWindow { public FullDay() { initComponents(); } private void initComponents() { int i; //to get the no of days of the current month. Calendar cal = Calendar.getInstance(); int maxdays = cal.getActualMaximum(Calendar.DAY_OF_MONTH); getContentPane().setLayout(new java.awt.FlowLayout()); //Creating an array of radiobuttons having size equal to the no of days of the current //month for(i=0; i&lt;maxdays; i++) { jRadioButton[maxdays] = new javax.swing.JRadioButton(); getContentPane().add(jRadioButton[i]); } pack(); } public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new FullDay().setVisible(true); } }); } private javax.swing.JRadioButton jRadioButton[]; } </code></pre> <p>But the error I am getting is :</p> <pre><code>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at components.FullDay.initComponents(FullDay.java:18) at components.FullDay.&lt;init&gt;(FullDay.java:8) at components.FullDay$1.run(FullDay.java:30) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre>
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