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POreference on Object which was transfered as parameter
 

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  1. POreference on Object which was transfered as parameter
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    <blockquote> <p>3rd Code Sample contains the error - how to solve?</p> </blockquote> <p>In the following code I have generated a method called "generator". This method receives a JTextField and a JLabel as parameter.</p> <p>It generates individual JPanels and adds them onto another JPanel (the one with the Border "Vermieter"). The result should look like this (marked red): </p> <p><a href="http://imageshack.us/photo/my-images/853/stammdateneraffsenguibe.png/" rel="nofollow">http://imageshack.us/photo/my-images/853/stammdateneraffsenguibe.png/</a></p> <p>here I am instantiating the the JTextFields as fields:</p> <pre><code>private JTextField txtplzvermieter; private JTextField txtemailvermieter; private JTextField txtgeburtsdatumvermieter; private JTextField txthandyvermieter; private JTextField txtidvermieter; private JTextField txtnamevermieter; private JTextField txtortvermieter; private JTextField txtstrassevermieter; private JTextField txttelefonvermieter; private JTextField txtvornamevermieter; </code></pre> <p>here I am calling my methode which I described above</p> <pre><code> public void vermieterPanel(JPanel verPanel){ verPanel.add(generator( "ID", txtidvermieter )); verPanel.add(generator("Name", txtnamevermieter )); verPanel.add(generator( "Vorname", txtvornamevermieter )); verPanel.add(generator( "Straße", txtstrassevermieter )); verPanel.add(generator("PLZ", txtplzvermieter )); verPanel.add(generator( "Ort", txtortvermieter )); verPanel.add(generator( "Geburtsdatum", txtgeburtsdatumvermieter )); verPanel.add(generator( "Telefon", txttelefonvermieter )); verPanel.add(generator("Handy", txthandyvermieter )); verPanel.add(generator( "E-Mail", txtemailvermieter )); </code></pre> <p>and here is the methode generator which contains the error:</p> <pre><code> public JPanel generator(String lableText, JTextField s){ // generiert ein Panel mit einer Zeile aus lable + TextFeld JPanel gens = new JPanel(); JLabel lable = new JLabel(lableText); lable.setPreferredSize(new Dimension(100,25)); s = new JTextField(); s.setPreferredSize(new Dimension(200, 25)); gens.add(lable); gens.add(s); return gens; } </code></pre> <p>later I can't get a reference on my TeftFields with <code>.getText();</code> because I have created a reference onto a new JTextField-Object here <code>s = new JTextField();</code></p> <p>If I remove the line in order to access my Objects I get a Null-Pointer exception.</p> <p>What am I doing wrong?</p>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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