PlainMessageDialog.getBuilder(shell, "Copied to clipboard")
        .message("Selected task copied to clipboard. Paste in any editor")
        .image(SWT.ICON_INFORMATION)
        .buttonLabels(List.of("Close"))
        .build()
        .open();

// standard message dialogs
MessageDialog.openConfirm(shell, "Confirm", "Please confirm");
MessageDialog.openError(shell, "Error", "Error occurred");
MessageDialog.openInformation(shell, "Info", "Info for you");
MessageDialog.openQuestion(shell, "Question", "Really, really?");
MessageDialog.openWarning(shell, "Warning", "I am warning you!");

boolean result = MessageDialog.openConfirm(shell, "Confirm", "Please confirm");

if (result) {
    // OK button selected
} else {
    // Cancel button selected
}

// customized MessageDialog with configured buttons
var dialog = new MessageDialog(shell, "My Title", null, "My message",
        MessageDialog.ERROR, 0, "First", "Second", "Third");
// index of the selected button, or -1 if the dialog was closed
int result = dialog.open();
System.out.println(result);

package com.vogella.tasks.ui.handlers;

import java.util.Arrays;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.MultiStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.swt.widgets.Shell;

public class ShowErrorDialogHandler {
    private static final String PLUGIN_ID = "com.vogella.tasks.ui";

    @Execute
    public void execute(Shell shell) {
        // create an exception on purpose to demonstrate the ErrorDialog
        try {
            String s = null;
            System.out.println(s.length());
        } catch (NullPointerException e) {
            MultiStatus status = createMultiStatus(e);
            ErrorDialog.openError(shell, "Error", "This is an error", status);
        }
    }

    // one child status per stack trace element, shown in the details area
    private static MultiStatus createMultiStatus(Throwable t) {
        IStatus[] children = Arrays.stream(t.getStackTrace())
                .map(element -> Status.error(element.toString()))
                .toArray(IStatus[]::new);
        return new MultiStatus(PLUGIN_ID, IStatus.ERROR, children, t.toString(), t);
    }
}

package com.vogella.tasks.ui.dialogs;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;

public class MyDialog extends Dialog {

    public MyDialog(Shell parentShell) {
        super(parentShell);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite container = (Composite) super.createDialogArea(parent);
        Button button = new Button(container, SWT.PUSH);
        button.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false));
        button.setText("Press me");
        button.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> System.out.println("Pressed")));

        return container;
    }

    // overriding this method allows you to set the title of the dialog
    @Override
    protected void configureShell(Shell newShell) {
        super.configureShell(newShell);
        newShell.setText("Selection dialog");
    }

    @Override
    protected Point getInitialSize() {
        return new Point(450, 300);
    }
}

package com.vogella.tasks.ui.dialogs;

import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class MyTitleAreaDialog extends TitleAreaDialog {

    private Text txtFirstName;
    private Text txtLastName;

    private String firstName;
    private String lastName;

    public MyTitleAreaDialog(Shell parentShell) {
        super(parentShell);
    }

    @Override
    public void create() {
        super.create();
        setTitle("This is my first custom dialog");
        setMessage("This is a TitleAreaDialog", IMessageProvider.INFORMATION);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite area = (Composite) super.createDialogArea(parent);
        Composite container = new Composite(area, SWT.NONE);
        container.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        container.setLayout(new GridLayout(2, false));

        createFirstName(container);
        createLastName(container);

        return area;
    }

    private void createFirstName(Composite container) {
        Label lblFirstName = new Label(container, SWT.NONE);
        lblFirstName.setText("First Name");

        txtFirstName = new Text(container, SWT.BORDER);
        txtFirstName.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
    }

    private void createLastName(Composite container) {
        Label lblLastName = new Label(container, SWT.NONE);
        lblLastName.setText("Last Name");

        txtLastName = new Text(container, SWT.BORDER);
        txtLastName.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
    }

    @Override
    protected boolean isResizable() {
        return true;
    }

    // save the content of the text fields, because they get disposed
    // as soon as the dialog closes
    private void saveInput() {
        firstName = txtFirstName.getText();
        lastName = txtLastName.getText();
    }

    @Override
    protected void okPressed() {
        saveInput();
        super.okPressed();
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }
}

// more imports
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;


var dialog = new MyTitleAreaDialog(shell);
// just to demonstrate how to set the title background color
dialog.setTitleAreaColor(Display.getDefault().getSystemColor(SWT.COLOR_DARK_GRAY).getRGB());

// now open the dialog
dialog.create();
if (dialog.open() == Window.OK) {
    System.out.println(dialog.getFirstName());
    System.out.println(dialog.getLastName());
}

package com.vogella.tasks.ui.dialogs;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;

public class MyNonModalDialog extends Dialog {

    public MyNonModalDialog(Shell parentShell) {
        super(parentShell);
        setShellStyle(SWT.CLOSE | SWT.MODELESS | SWT.BORDER | SWT.TITLE);
        setBlockOnOpen(false);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite container = (Composite) super.createDialogArea(parent);
        Button button = new Button(container, SWT.PUSH);
        button.setLayoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false));
        button.setText("Press");
        return container;
    }

    @Override
    protected Point getInitialSize() {
        return new Point(450, 300);
    }
}

// a plain text notification which closes itself after 3 seconds
NotificationPopup.forShell(shell)
        .title("Task saved", true) (1)
        .text("Your changes have been saved.")
        .delay(3000)
        .open();

// a notification with custom content
NotificationPopup.forShell(shell)
        .title("Update available", true)
        .titleImage(updateIcon)
        .fadeIn(true)
        .content(parent -> { (2)
            WidgetFactory.label(SWT.WRAP).text("A new version of the application is available.").create(parent);
            WidgetFactory.button(SWT.PUSH).text("Restart now")
                    .onSelect(_ -> workbench.restart())
                    .create(parent);
            return parent;
        })
        .open();