How can I set the size of the window (shell) in SWT?

This is the code that I have. How can I set the size of the window with respect to the size of the screen. Let's say I want to make the window size 1/2 of the screen size.

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CTabFolder;
import org.eclipse.swt.custom.CTabItem;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.graphics.Image;


public class Gui {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
               
        shell.setText("My Tool");
        shell.setLayout(new GridLayout());
        // SWT.BOTTOM to show at the bottom
        CTabFolder folder = new CTabFolder(shell, SWT.TOP);
        GridData data = new GridData(GridData.FILL,
                GridData.FILL, true, true,
                20, 10);
        folder.setLayoutData(data);
        CTabItem cTabItem1 = new CTabItem(folder, SWT.NONE);
        cTabItem1.setText("A");
        CTabItem cTabItem2 = new CTabItem(folder, SWT.NONE);
        cTabItem2.setText("B");
        CTabItem cTabItem3 = new CTabItem(folder, SWT.NONE);
        cTabItem3.setText("C");
               
        Composite compTab1 = new Composite(folder, SWT.NULL);      
        // Create the layout.
        RowLayout layout = new RowLayout();
        // Optionally set layout fields.
        layout.wrap = true;
        // Set the layout into the composite.
        // shell.setLayout(layout);
        // Create the children of the composite.
        new Button(compTab1, SWT.PUSH).setText("B1");
        new Button(compTab1, SWT.PUSH).setText("Wide Button 1");
        new Button(compTab1, SWT.PUSH).setText("Button 1");
        
        Text text = new Text(folder, SWT.BORDER);
        text.setText("You can type the list of files in this field");
        cTabItem1.setControl(text);
       
        compTab1.setLayout(layout);
       
        Composite compTab2 = new Composite(folder, SWT.NULL);
       
        FillLayout fillLayoutChecks = new FillLayout();
        fillLayoutChecks.type = SWT.HORIZONTAL;
        new Button(compTab2, SWT.PUSH).setText("B2");
        new Button(compTab2, SWT.PUSH).setText("Wide Button 2");
        new Button(compTab2, SWT.PUSH).setText("Button 2");
       
        compTab2.setLayout(fillLayoutChecks);
        cTabItem2.setControl(compTab2);
        
        Composite compTab3 = new Composite(folder, SWT.NULL);
        
        FillLayout fillLayoutResults = new FillLayout();
        fillLayoutResults.type = SWT.HORIZONTAL;
        new Button(compTab3, SWT.PUSH).setText("B3");
        new Button(compTab3, SWT.PUSH).setText("Wide Button 3");
        new Button(compTab3, SWT.PUSH).setText("Button 3");
       
        compTab3.setLayout(fillLayoutResults);
        cTabItem3.setControl(compTab3);
        
        
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
    }
} 

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TolgarAsked:
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TolgarAuthor Commented:
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