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POArraylist to 2D array and then to a JTable
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  1. POArraylist to 2D array and then to a JTable
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    copied!<p>i'm struggeling to make my arraylist into an 2D array and then adding it on a table to show the data. </p> <pre><code>import java.awt.*; import javax.swing.*; import java.util.ArrayList; import java.util.List; public class Planettabell { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { JFrame vindu = new Test(); vindu.setVisible(true); } }); } } class Test extends JFrame { private String[] name = {"Name", "grade"}; Object[][] cell = {{"nameHer", "GradeHer"}}; Object[][] cell2 = {{"nameHer2", "gradeHer2"}}; Object[][] cell3 = {{"nameHer3", "gradeHer3"} }; public Test() { setTitle("Planettabell"); setSize(500, 210); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); List&lt;Object[]&gt; list = new ArrayList&lt;Object[]&gt;(); list.add(cell); list.add(cell2); list.add(cell3); Object[][]array = list.toArray(new Object[list.size()][]); JTable tabell = new JTable(array, name); Container c = getContentPane(); c.setLayout(new FlowLayout()); c.add(new JScrollPane(tabell), BorderLayout.CENTER); } } </code></pre> <p>i will get this message if i run it <code>Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1</code></p> <p>this code is working if i add 'cell' instead of 'array' on JTable, but i need the entire array from list to work. </p> <p>i have also tried:</p> <pre><code> int number = list.size()/2; Object[][] ArrayNew = new Object[number][2]; for(int x = 0; x&lt; number; x++) { for(int z = 0; z &lt; 2; z++) { int y = 2 * x; ArrayNew [x][z] = list.get(y+z); } } JTable tabell = new JTable(ArrayNew, name); </code></pre> <p>instead of list.toarray. But then i only gett [[Ljava.lang.Object;@28864ae7 and [[Ljava.lang.Object;@49214a13 where the text in the table supposed to be.</p> <p>would appreicate any answer :)</p>
 

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