SWT Java Tutorial

To get and set a button's image label, use the following method

public Image getImage()
    public void setImage(Image image)

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ButtonImageAdd {
  public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Image image = new Image(display, "yourFile.gif");
    
    Button button = new Button(shell, SWT.PUSH);
    
    button.setImage(image);
    button.setText("button");
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
  }
}