Edit C:\Program Files\Java\jdk1.8.0_121\javafx\scene\control\TextInputDialog.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
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 *
 *
 */
package javafx.scene.control;

import com.sun.javafx.scene.control.skin.resources.ControlResources;
import javafx.application.Platform;
import javafx.beans.NamedArg;
import javafx.geometry.Pos;
import javafx.scene.control.ButtonBar.ButtonData;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.Region;

/**
 * A dialog that shows a text input control to the user.
 *
 * @see Dialog
 * @since JavaFX 8u40
 */
public class TextInputDialog extends Dialog<String> {

/**************************************************************************
     *
     * Fields
     *
     **************************************************************************/

private final GridPane grid;
    private final Label label;
    private final TextField textField;
    private final String defaultValue;

/**************************************************************************
     *
     * Constructors
     *
     **************************************************************************/

/**
     * Creates a new TextInputDialog without a default value entered into the
     * dialog {@link TextField}.
     */
    public TextInputDialog() {
        this("");
    }

/**
     * Creates a new TextInputDialog with the default value entered into the
     * dialog {@link TextField}.
     */
    public TextInputDialog(@NamedArg("defaultValue") String defaultValue) {
        final DialogPane dialogPane = getDialogPane();

// -- textfield
        this.textField = new TextField(defaultValue);
        this.textField.setMaxWidth(Double.MAX_VALUE);
        GridPane.setHgrow(textField, Priority.ALWAYS);
        GridPane.setFillWidth(textField, true);

// -- label
        label = DialogPane.createContentLabel(dialogPane.getContentText());
        label.setPrefWidth(Region.USE_COMPUTED_SIZE);
        label.textProperty().bind(dialogPane.contentTextProperty());

this.defaultValue = defaultValue;

this.grid = new GridPane();
        this.grid.setHgap(10);
        this.grid.setMaxWidth(Double.MAX_VALUE);
        this.grid.setAlignment(Pos.CENTER_LEFT);

dialogPane.contentTextProperty().addListener(o -> updateGrid());

setTitle(ControlResources.getString("Dialog.confirm.title"));
        dialogPane.setHeaderText(ControlResources.getString("Dialog.confirm.header"));
        dialogPane.getStyleClass().add("text-input-dialog");
        dialogPane.getButtonTypes().addAll(ButtonType.OK, ButtonType.CANCEL);

updateGrid();

setResultConverter((dialogButton) -> {
            ButtonData data = dialogButton == null ? null : dialogButton.getButtonData();
            return data == ButtonData.OK_DONE ? textField.getText() : null;
        });
    }

/**************************************************************************
     *
     * Public API
     *
     **************************************************************************/

/**
     * Returns the {@link TextField} used within this dialog.
     */
    public final TextField getEditor() {
        return textField;
    }

/**
     * Returns the default value that was specified in the constructor.
     */
    public final String getDefaultValue() {
        return defaultValue;
    }

/**************************************************************************
     *
     * Private Implementation
     *
     **************************************************************************/

private void updateGrid() {
        grid.getChildren().clear();

grid.add(label, 0, 0);
        grid.add(textField, 1, 0);
        getDialogPane().setContent(grid);

Platform.runLater(() -> textField.requestFocus());
    }
}

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