How to change the font size of a JLabel that is in a "panel.add(new JLabel(""));"

Question

I know how to change the font size of a JLabel the normal way

exampleLabel.setFont(new Font("", Font.PLAIN, 20));

But im looking to see if there is a way of doing it when you add a JLabel to a panel the simple way. like this..

examplePanel.add(new JLabel("this is an example"));

How would i change the font size of the latter, seeing as the JLabel doesn't have a name?

i tried setting the font on the JPanel but it doesn't work.

examplePanel.setFont(.......);

Any help with this would be appreciated.

Answer 1

It's a strange way to access a JLabel but this may work ...

Component[] components = examplePanel.getComponents();

for (Component singleComponent : components) {
   if (singleComponent instanceof JLabel) {
       JLabel label = (JLabel) singleComponent;

       if ("this is an example".equals(label.getText()) {
              label.setFont(new Font("", Font.PLAIN, 20));
       }
   }
}

Another way, create a new class for those JLabels that you want to change.

public class JMyFontLabel extends JLabel {
  boolean applyFontChange = false;

  public JMyFontLabel(String text, boolean applyFontChange) {
         super(text);
         this.applyFontChange = applyFontChange;
  }

  // get / set methods for applyFontChange.
} 

// Method to apply font
public void setMyFont(JPanel examplePanel, Font myFont) {
   Component[] components = examplePanel.getComponents();

   for (Component singleComponent : components) {

   if (singleComponent instanceof JMyFontLabel) {
       JMyFontLabel label = (JMyFontLabel) singleComponent;

       if (label.isApplyFontChange()) {
          label.setFont(myFont);
       }
   }
}

On label creation, set applyFontChange

   examplePanel.add(new JMyFontLabel("Name", true));