Java11Example.java

public class Java11Example {
    public static void main(String[] args) {
        // Set custom security manager
        System.setSecurityManager(new CustomSecurityManager());

        // Perform security check
        try {
            System.getSecurityManager().checkPermission(new RuntimePermission("customSecurityCheck"));
            System.out.println("Security check passed.");
        } catch (SecurityException e) {
            System.out.println("Security check failed: " + e.getMessage());
        }
    }

    private static class CustomSecurityManager extends SecurityManager {
        @Override
        public void checkPermission(java.security.Permission perm) {
            if ("customSecurityCheck".equals(perm.getName())) {
                if (!customSecurityCheck()) {
                    throw new SecurityException("Custom security check failed.");
                }
            } else {
                super.checkPermission(perm);
            }
        }

        private boolean customSecurityCheck() {
            // Implement your custom security logic here
            // For example, check user permissions, environment variables, etc.
            // Return true if the check passes, false otherwise
            return true; // Placeholder for actual security logic
        }
    }
}