Java-SWT：如何更新标签？

Question

I'm new at Java SWT. I created the game"2048" ( by MVP model), and I try to update the Score label in the Gui - I don't know why but the score doesn't updated. I'm not sure how to use all the Listners and which one will be good for this action, can you help me?

public void buttons() {
    Group group = new Group(this.shell, SWT.SHADOW_OUT);
    final Label label2 = new Label(group, SWT.BORDER);
    Button UndoMove = new Button(group, SWT.PUSH);
    Button RestartGame = new Button(group, SWT.PUSH);
    Button LoadGame = new Button(group, SWT.PUSH);
    Button SaveGame = new Button(group, SWT.PUSH);

    group.setLayout(new GridLayout(1, false));

    **int i = board.getScore();
    label2.setText("Your Score is: " + i);

    label2.update();**

    public class GameBoard extends Canvas {

        protected int N;
        protected Tile[][] tile;
        int[][] boardData;
        protected int Score = 0;
        protected int MaxScore = 0;

        public GameBoard(Composite arg0, int arg1, int n) {
            super(arg0, arg1);

            N = n;
            boardData = new int[N][N];
            setLayout(new GridLayout(N, true));
            tile = new Tile[N][N];

        }

        public void initilizeValueInTile() {

            if (boardData != null) {
                for (int i = 0; i < N; i++)
                    for (int j = 0; j < N; j++) {

                        if (tile[i][j] == null) {
                            tile[i][j] = new Tile(this, SWT.BORDER);
                            tile[i][j].setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

                        }
                        tile[i][j].setValue(boardData[i][j]);

                    }
            }
        }


        public void setBoard(int[][] data) {
            boardData = data;
            initilizeValueInTile();

        }

        **

        public void SetScore(int s) {
            Score = s;

        }

        public int getScore() {
            return Score;**
        }


        public class GameView extends Observable implements View

        @Override
        public void displayScore(int score) {
            System.out.println(score);
            board.SetScore(score);


        }

Answer 1

To update the label you just need to call label.setText , as you do. If you want to do it when the score is changed, the simplest approach is just to call label.setText in displayScore or in SetScore (the normal Java name would be setScore ). This doesn't fit into MVP pattern, but I don't see it in your code anyway.