Databases
StackOverflow2013
Postsdbo
POSwing JForm freezes until an action is finished
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POSwing JForm freezes until an action is finished
    primarykey
    data
    text
    <p>I want to create a Java application that visualizes merge sort using swing components. So far I've written this:</p> <pre><code>import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Random; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextArea; public class MergeSort extends JFrame { private int[] helper; private int[] heights; private JPanel mainPanel; private JTextArea[] areas; private JTextArea txtSpeed; private JLabel lblSpeed; private JButton btnStart; private Random rnd; private final int FRAME_HEIGHT = 550; private final int FRAME_WIDTH = 1100; private final int ELEMENTS_TO_SORT = 100; private final int BAR_WIDTH = 7; private final int SPACING = 10; private int SLEEP_TIME = 50; public MergeSort() { super("Merge Sort Visualisation"); helper = new int[ELEMENTS_TO_SORT]; mainPanel = new JPanel(); mainPanel.setLayout(null); rnd = new Random(); areas = new JTextArea[ELEMENTS_TO_SORT]; heights = new int[areas.length]; for (int i = 0; i &lt; areas.length; i++) { areas[i] = new JTextArea(); heights[i] = rnd.nextInt(FRAME_HEIGHT - 100); mainPanel.add(areas[i]); areas[i].setSize(BAR_WIDTH, heights[i]); areas[i].setLocation((i + 1) * SPACING, FRAME_HEIGHT - areas[i].getHeight()); areas[i].setText(toDigits(heights[i])); } btnStart = new JButton("Start"); btnStart.addActionListener( new ActionListener() { @Override public void actionPerformed(ActionEvent e) { try { setSleepTime(Integer.parseInt(txtSpeed.getText())); sort(); } catch (NumberFormatException ex) { //s } catch (InterruptedException ex) { //i } } } ); mainPanel.add(btnStart); btnStart.setSize(100, 25); btnStart.setLocation(0, 25); txtSpeed = new JTextArea("50"); mainPanel.add(txtSpeed); txtSpeed.setSize(100, 25); txtSpeed.setLocation(0, 0); lblSpeed = new JLabel("Sleep Time"); mainPanel.add(lblSpeed); lblSpeed.setSize(100, 25); lblSpeed.setLocation(110, 0); this.add(mainPanel); this.setSize(FRAME_WIDTH, FRAME_HEIGHT); } private void setSleepTime(int x) { if (x &gt;= 0) { SLEEP_TIME = x; } else { SLEEP_TIME = 0; } } public void sort() throws InterruptedException { mergesort(0, heights.length - 1); } private void mergesort(int low, int high) throws InterruptedException { if (low &lt; high) { int middle = low + (high - low) / 2; mergesort(low, middle); mergesort(middle + 1, high); merge(low, middle, high); } } private void merge(int low, int middle, int high) throws InterruptedException { for (int i = low; i &lt;= high; i++) { helper[i] = heights[i]; } int i = low; int j = middle + 1; int k = low; while (i &lt;= middle &amp;&amp; j &lt;= high) { if (helper[i] &lt;= helper[j]) { heights[k] = helper[i]; updateAreaX(k); Thread.currentThread().sleep(SLEEP_TIME); i++; } else { heights[k] = helper[j]; updateAreaX(k); Thread.currentThread().sleep(SLEEP_TIME); j++; } k++; } // Copy the rest of the left side of the array into the target array while (i &lt;= middle) { heights[k] = helper[i]; updateAreaX(k); Thread.currentThread().sleep(SLEEP_TIME); k++; i++; } } private String toDigits(int a) { StringBuilder bdr = new StringBuilder(); while (a &gt; 0) { bdr.insert(0, Integer.toString(a % 10) + String.format("%n")); a /= 10; } if (bdr.length() &gt; 0) { bdr.setLength(bdr.length() - 1); } return bdr.toString(); } private void updateAreaX(int x) { areas[x].setSize(BAR_WIDTH, heights[x]); areas[x].setLocation(areas[x].getLocation().x, FRAME_HEIGHT - areas[x].getHeight() - 40); areas[x].setText(toDigits(heights[x])); } public static void main(String[] args) throws InterruptedException { MergeSort sorter = new MergeSort(); sorter.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); sorter.setVisible(true); } } </code></pre> <p>The problem is that when i click the start button the whole JFrame freezes until everything is sorted and then it displays the result. If i don't start the <code>sort()</code> method via the button but write <code>sorter.sort()</code> in the public static void main() it works. How can I fix it? I guess I need to put the sorting on another thread or something but i have no idea how.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmKorbel
    1. USuser2419750
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. CODon't use `.sleep()`. Use swing `Timer`
      singulars
      1. POSwing JForm freezes until an action is finished
      1. USPaul Samsotha
    2. COThis has been asked many, *many*, ***many*** times here. Consider searching before asking.
      singulars
      1. POSwing JForm freezes until an action is finished
      1. USHovercraft Full Of Eels
    3. COFor example, this is a possible duplicate of [swing window getting frozen ,not displaying content](http://stackoverflow.com/questions/20161828/swing-window-getting-frozen-not-displaying-content). Also [here](http://stackoverflow.com/questions/10689898/thread-sleep-is-freezing), and [here](http://stackoverflow.com/questions/16498174/thread-sleep-in-actionperformed),.... and many more. Voting to close this question as a duplicate.
      singulars
      1. POSwing JForm freezes until an action is finished
      1. USHovercraft Full Of Eels
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload