test/jdk/java/awt/FontClass/FontUnderscoreTest.java

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import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;

import javax.swing.JPanel;

/*
 * @test
 * @bug 4248579
 * @summary Make sure the underscore glyph appears in the different strings
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual FontUnderscoreTest
 */

public class FontUnderscoreTest extends JPanel {
    public static void main(String[] args) throws Exception {
        final String INSTRUCTIONS = """
                Make sure all 8 underscore characters appear in each
                of the 3 strings.

                Press PASS if all 8 are there, else FAIL.""";

        PassFailJFrame.builder()
                .title("FontUnderscoreTest Instruction")
                .instructions(INSTRUCTIONS)
                .columns(35)
                .splitUI(FontUnderscoreTest::new)
                .build()
                .awaitAndCheck();
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(550, 230);
    }

    @Override
    public void paint(Graphics g) {
        Font f = new Font(Font.SANS_SERIF, Font.PLAIN, 24);
        g.setFont(f);
        g.drawString ("8 underscore characters appear in each string", 5, 200);

        g.drawString("J_A_V_A_2_j_a_v_a", 25, 50);

        f = new Font(Font.SERIF, Font.PLAIN, 24);
        g.setFont(f);
        g.drawString("J_A_V_A_2_j_a_v_a", 25, 100);

        f = new Font(Font.MONOSPACED, Font.PLAIN, 24);
        g.setFont(f);
        g.drawString("J_A_V_A_2_j_a_v_a", 25, 150);
    }
}