convert the code to Java:

public function admin_notices() {

$user_id = get_current_user_id();

// if the user isn't an admin, definitely don't show the notice

if ( ! current_user_can( 'manage_options' ) ) {

return;

}

// update the setting for the current user

if ( isset( $_GET['new-user-approve-settings-notice'] ) && '1' == $_GET['new-user-approve-settings-notice'] ) {

add_user_meta( $user_id, 'pw_new_user_approve_settings_notice', '1', true );

}

$show_notice = get_user_meta( $user_id, 'pw_new_user_approve_settings_notice' );

// one last chance to show the update

$show_notice = apply_filters( 'new_user_approve_show_membership_notice', $show_notice, $user_id );

// Check that the user hasn't already clicked to ignore the message

if ( ! $show_notice ) {

echo '

';

printf( __( 'The Membership setting must be turned on in order for the New User Approve to work correctly. Update in settings. | Hide Notice', 'new-user-approve' ), admin_url( 'options-general.php' ), add_query_arg( array( 'new-user-approve-settings-notice' => 1 ) ) );

echo "

";

}

}

private function __construct() {
	// Load up the localization file if we're using WordPress in a different language
	// Just drop it in this plugin's "localization" folder and name it "new-user-approve-[value in wp-config].mo"
	load_plugin_textdomain( 'new-user-approve', false, dirname( plugin_basename( __FILE__ ) ) . '/localization' );
	register_activation_hook( __FILE__, array( $this, 'activation' ) );
	register_deactivation_hook( __FILE__, array( $this, 'deactivation' ) );
	// Actions
	add_action( 'wp_loaded', array( $this, 'admin_loaded' ) );
	add_action( 'rightnow_end', array( $this, 'dashboard_stats' ) );
	add_action( 'user_register', array( $this, 'delete_new_user_approve_transient' ), 11 );
	add_action( 'new_user_approve_approve_user', array( $this, 'delete_new_user_approve_transient' ), 11 );
	add_action( 'new_user_approve_deny_user', array( $this, 'delete_new_user_approve_transient' ), 11 );
	add_action( 'deleted_user', array( $this, 'delete_new_user_approve_transient' ) );
	//add_action( 'register_post', array( $this, 'request_admin_approval_email' ), 10, 3 );
	add_action( 'register_post', array( $this, 'create_new_user' ), 10, 3 );
	add_action( 'lostpassword_post', array( $this, 'lost_password' ) );
	add_action( 'user_register', array( $this, 'add_user_status' ) );
	add_action( 'user_register', array( $this, 'request_admin_approval_email_2' ) );
	add_action( 'new_user_approve_approve_user', array( $this, 'approve_user' ) );
	add_action( 'new_user_approve_deny_user', array( $this, 'deny_user' ) );
	add_action( 'new_user_approve_deny_user', array( $this, 'update_deny_status' ) );
	add_action( 'admin_init', array( $this, 'verify_settings' ) );
	add_action( 'wp_login', array( $this, 'login_user' ), 10, 2 );