Question

绘制JLabel时，我的JLabel以变量0开始。另一个线程不断增加此值，我想更新标签。

如果可能的话，我不希望线程访问标签。（gm.getPlayerByListIndex（index）.getAlk（））得到更新

[
  {
    "clusters": [
      {
        "sentences": [
          " Qoum &amp; Maa Baap K Duaon Se Award Haasil Kiya",
          " Qoum &amp; Maa Baap K Duaon Se Award Haasil Kiya",
          " Qoum &amp; Maa Baap K Duaon Se Award Haasil Kiya"
        ],
        "summary": " Qoum &amp; Maa Baap K Duaon Se Award Haasil Kiya. Qoum &amp; Maa Baap K Duaon Se Award Haasil Kiya."
      },
      {
        "sentences": [
          " Mushtaq Ahmed",
          " Mushtaq Ahmed",
          " Mushtaq Ahmed NIJAMHAMY"
        ],
        "summary": " Mushtaq Ahmed. Mushtaq Ahmed NIJAMHAMY."
      }
    ]
  }
]

增加价值的线程：

    createPlayer.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            boolean checked = checkInputs(nameInput, difficultyInput);
            if (checked) {
                String playername = getInput(nameInput);
                addPlayerToMainWindow(gm.getRegisteredPlayers().size(), playername);
                gm.createPlayer(playername, Integer.parseInt(getInput(difficultyInput)));
                dialog.dispose();
                JLabel alkLabel = new JLabel(Integer.toString(gm.getPlayerByListIndex(index).getAlk()));
                window.getWindow().getContentPane().add(alkLabel);
                alkLabel.setVisible(true);
                alkLabel.setBounds(160, (120 * index) + 50, 100, 50);

            }
        }

    });

Answer 1

在这种情况下，您可以使用Observer pattern。

您将需要和Observer这样的类（注意：），该实现假定library(tidyverse) df %>% mutate_all(str_remove, "0+$") %>% map2_dfr(., df, ~ tibble(x = nchar(.x), grp = nchar(.y)) %>% group_by(grp) %>% summarise(x = median(x)), .id = 'colName') # A tibble: 7 x 3 # colName grp x # <chr> <int> <dbl> #1 A 3 3 #2 A 4 4 #3 A 5 5 #4 B 1 1 #5 B 2 2 #6 C 2 2 #7 C 3 2.5和equals在hashCode类中实现）：

Player

现在您的分配器类应该充当Obervable类，因此您的public class JLabelObserver{ private JLabel label; private Player player; public JLabelObserver(JLabel label, Player player){ this.label = label; this.player = player; } public update(Player player){ if(this.player.equals(player)) label.setText(player.getAlk()) } }看起来像这样：

Dispenser

最后，在创建JLabel之后，还创建并观察者：

public class Dispenser extends Thread {

    List<Player> players = GameManager.getInstance().getRegisteredPlayers();
    List<JLabelObserver> observers = new ArrayList<>();

    public void run() {

       while (true) {
           System.out.println("alive");
           try {
               for (Player p : players) {
                   p.setAlk(p.getAlk() + p.getDifficulty()); // TODO too hard
                   notifyObservers(p)
               }
            } catch (ConcurrentModificationException e) {
                System.out.println("playerlist in use, retry");
            }
            try {
               sleep(1000); // TODO too short
            } catch (InterruptedException e1) {
               // TODO Auto-generated catch block
               e1.printStackTrace();
           }
        }
   }

   public static addObserver(JLabelObserver observer){
       observers.add(observer);
   }

   public static notifyObservers(Player player){
        for(JLabelObserver observer : observers){
             observer.update(player);
        }
   }
}

如何在更改的文本上动态更新JLabel？

1 个答案: