test/jdk/javax/swing/JLabel/bug4945795.java

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/* @test
 * @bug 4945795
 * @summary With mnemonic hiding turned on, Java does not display all mnemonics with ALT key
 * @requires (os.family == "windows")
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual bug4945795
 * */

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.UIManager;

public class bug4945795 {

    static final String INSTRUCTIONS = """
        This test is for the Swing Windows Look And Feel.
        A test window will be displayed with the label 'Mnemonic Test'
        Click the mouse in the test window to make sure it has keyboard focus.
        Now press and hold the 'Alt' key.
        An underline should be displayed below the initial 'M' character.
        If it is press PASS, else press FAIL.
    """;

    public static void main(String[] args) throws Exception {
        PassFailJFrame.builder()
            .instructions(INSTRUCTIONS)
            .columns(40)
            .testUI(bug4945795::createUI)
            .build()
            .awaitAndCheck();
    }

    static JFrame createUI() {
        JFrame mainFrame = new JFrame("Bug4945795");
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception ex) {
            throw new RuntimeException("Can not set system look and feel");
        }
        mainFrame.setLayout(new BorderLayout());
        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JLabel label = new JLabel("Mnemonic test");
        label.setDisplayedMnemonic('M');
        mainFrame.add(label, BorderLayout.NORTH);
        mainFrame.setSize(400, 300);
        return mainFrame;
    }
}