How to call a method from another class using Java

Question

How can I call a method when I press a button from a separate class?

For example, when the click event fires on the Save button I want to call the setRDF method from the other class named GenerateRDF

This is my code:

public class PersonalInfo extends JPanel { private void initialize() { JButton btnSave = new JButton("Save"); btnSave.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { // call the `setRDF` method here } }); } } public class GenerateRDF extends Object { public void setRDF() { String personURI = "http://localhost/amitkumar"; String givenName = "Amit"; String familyName = "Kumar"; String fullName = givenName+familyName; Model model = ModelFactory.createDefaultModel(); Resource node = model.createResource(personURI) .addProperty(VCARD.FN, fullName) .addProperty(VCARD.N, model.createResource() .addProperty(VCARD.Given, givenName) .addProperty(VCARD.Family, familyName)); model.write(System.out); } }

Side note: extends Object is not necessary, it's implicit. All classes extend Object by default in java. And if Object is a class you created, you should rename it. Creating classes with the same name as other default java classes is the best way to confuse other developers. — BackSlash
– BackSlash, Commented Mar 22, 2017 at 19:58

nhouser9 · Accepted Answer · 2017-03-22 19:50:37Z

You would create a new GenerateRDF object and call the method on that. For example:

public class PersonalInfo extends JPanel { private void initialize() { JButton btnSave = new JButton("Save"); btnSave.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { GenerateRDF generator = new GenerateRDF(); generator.setRDF(); } }); } }

Side note: you don't need to write extends Ojbect; everything extends Object by default.

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