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GridData

import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class GridLayoutHORIZONTALALIGNCENTER {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     GridLayout layout = new GridLayout();     layout.numColumns = 3;     layout.makeColumnsEqualWidth = true;     shell.setLayout(layout);     // Create the big button in the upper left     GridData data = new GridData(GridData.FILL_BOTH);     data.widthHint = 200;     Button one = new Button(shell, SWT.PUSH);     one.setText("one");     one.setLayoutData(data);     // Create a composite to hold the three buttons in the upper right     Composite composite = new Composite(shell, SWT.NONE);          // Create button "three"     data = new GridData(GridData.HORIZONTAL_ALIGN_CENTER);     Button three = new Button(composite, SWT.PUSH);     three.setText("three");     three.setLayoutData(data);     shell.pack();     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }