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Forum:
Swing / AWT / SWT
Checkboxes in java
Kavali viswa teja
Greenhorn
Posts: 1
posted 11 years ago
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I am writing a program in
java
with four checkboxes and textfeild.
package ddd; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.UIManager; @SuppressWarnings("serial") public class openpdf extends JFrame implements ItemListener { public JCheckBox Capital; public JCheckBox Small; public JCheckBox Numbers; public JCheckBox Space; public char charlist[]; JTextField jTextField1 = new javax.swing.JTextField(); public openpdf() { setTitle("BruteForce Password Cracker"); setDefaultCloseOperation(EXIT_ON_CLOSE); setVisible(true); Capital = new JCheckBox("CapitalLetters(A-Z)"); add(Capital); Small = new JCheckBox("SmallLetters(a-z)"); add(Small); Numbers = new JCheckBox("Numbers(0-9)"); add(Numbers); Space = new JCheckBox("Space( )"); add(Space); Capital.addItemListener(this); Small.addItemListener(this); Numbers.addItemListener(this); Space.addItemListener(this); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup(layout.createSequentialGroup() .addGap(43, 43, 43) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 243, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createSequentialGroup() .addGap(27, 27, 27) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(Small) .addComponent(Capital) .addComponent(Numbers) .addComponent(Space)) .addGap(0, 0, Short.MAX_VALUE))) .addContainerGap(89, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(34, 34, 34) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(32, 32, 32) .addComponent(Capital) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(Small) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(Numbers) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(Space) .addContainerGap(122, Short.MAX_VALUE)) ); pack(); } public void itemStateChanged(ItemEvent ie) { Object source = ie.getItemSelectable(); if(source == Capital) { String c1 = "ABCD"; c1 = (String) charlist.toString().concat(c1); charlist = c1.toCharArray(); jTextField1.setText(charlist.toString()); } if(source == Small) { String c2 = "abcd"; c2 = (String) charlist.toString().concat(c2); charlist = c2.toCharArray(); jTextField1.setText(charlist.toString()); } if(source == Numbers) { String c3 = "0123"; c3 = (String) charlist.toString().concat(c3); charlist = c3.toCharArray(); jTextField1.setText(charlist.toString()); } if(source == Space) { char[] c4 = {' '}; charlist = (new String(charlist)+new String(c4)).toCharArray(); jTextField1.setText(charlist.toString()); } } public static void main(String args[]) { try { for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(openpdf.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(openpdf.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(openpdf.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(openpdf.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new openpdf().setVisible(true); } }); } }
If a checkbox is then the characters has to set the textfeild.
Please help me in that...
Mack Wilmot
Ranch Hand
Posts: 88
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posted 11 years ago
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You never initialize charlist to anything, therefore it is a null pointer.
Rob Camick
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Posts: 3324
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posted 11 years ago
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Use proper naming conventions. Variable not should start with a lower case character NOT an upper case character:
public JCheckBox Capital; public JCheckBox Small; public JCheckBox Numbers; public JCheckBox Space;
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