import javax.swing.*; 
import java.awt.*; 
import java.awt.font.*; 

/* @test @(#)TestVS.java
 * @summary Verify two identical 'a's are rendered
 * @bug 8187100
 * @ignore Requires a special font installed.
 */
public class VariationSelectorTest { 
    // A font supporting Unicode variation selectors is required 
    private static final Font FONT = new Font("DejaVu Sans", Font.PLAIN, 12); 

    public static void main(String[] args) { 
        SwingUtilities.invokeLater(() -> { 
            JFrame frame = new JFrame(); 
            frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
            frame.add(new MyComponent()); 
            frame.setSize(200, 200); 
            frame.setVisible(true); 
            frame.setLocationRelativeTo(null); 
        }); 
    } 

    private static class MyComponent extends JComponent { 
        @Override 
        protected void paintComponent(Graphics g) { 
            Graphics2D g2d = (Graphics2D) g; 
            FontRenderContext frc = g2d.getFontRenderContext(); 
            String text = "a"; 
            GlyphVector gv = FONT.layoutGlyphVector(frc, text.toCharArray(), 0, text.length(), Font.LAYOUT_LEFT_TO_RIGHT); 
            g2d.drawGlyphVector(gv, 80, 50); 
            String text2 = "a\ufe00"; 
            GlyphVector gv2 = FONT.layoutGlyphVector(frc, text2.toCharArray(), 0, text2.length(), Font.LAYOUT_LEFT_TO_RIGHT); 
            g2d.drawGlyphVector(gv2, 80, 100);
        } 
    } 
}