Displaying an ArrayList?

Question

ArrayList <String> cdcollection = new ArrayList();

private void initButtonActionPerformed(java.awt.event.ActionEvent evt) {
    Collections.addAll(cdcollection, "small", "mayre", "brown", "evner", "rain" );
    initButton.setEnabled(false);

}

private void displayButtonActionPerformed(java.awt.event.ActionEvent evt) {

          for (int i = 0; i < cdcollection.size(); i++)  {
          mainTextArea.setText(cdcollection.get(i));
    }
}

private void addButtonActionPerformed(java.awt.event.ActionEvent evt) {
    cdcollection.add(cdtitleInput.getText());
}

private void removeButtonActionPerformed(java.awt.event.ActionEvent evt) {
    cdcollection.remove(cdcollection.size()-1);
}

When I run this and click the display button only the last cd title (rain) appears... How can I get all five cd titles to appear each on one line?

Fahim Parkar · Accepted Answer · 2012-05-21 16:31:20Z

8

Use Append() instead of setText()

edited May 21, 2012 at 16:31

Fahim Parkar

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answered May 21, 2012 at 16:26

OmniOwl

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1 Comment

OmniOwl Over a year ago

You can do line splits with \n . If you have to, you can also use setText() to clear the box, before using append().

Fahim Parkar · Accepted Answer · 2012-05-21 16:28:28Z

0

Do changes in displayButtonActionPerformed method as shown below.

private void displayButtonActionPerformed(java.awt.event.ActionEvent evt) {    
    String str = "";
    for (int i = 0; i < cdcollection.size(); i++)  {
          str = str + cdcollection.get(i);
    }
    mainTextArea.setText(str);
}

answered May 21, 2012 at 16:28

Fahim Parkar

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2 Comments

May Over a year ago

Thanks, this works better because append affects the add button by adding the whole collection when pressed.

user unknown Over a year ago

Simplified for-loop isn't for you?

user unknown · Accepted Answer · 2012-05-21 23:22:37Z

0

Use the simplified for-loop.

private void displayButtonActionPerformed (ActionEvent evt) {    
    for (String cd : cdcollection) {
          mainTextArea.append (cd + "\n");
    }
}

It will often prevent off-by-one errors, it is often shorter and it is better readable.

answered May 21, 2012 at 23:22

user unknown

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