java - 通过运行线程更改 main 方法中变量 x 的值

Question

public static void main(String args[]) throws Exception {
    int maxScore = 0;

Thread student = new Thread(client,????);
student.start();
}

我希望学生线程更改 maxScore 的值，我该如何在 Java 中执行此操作？ (就像在 C 中我们可以传递 maxScore 的地址)

Answer 1

如果你想在单独的线程中修改值，你需要一个类对象。例如:

public class Main {

    private static class Score {
        public int maxScore;
    }

    public static void main(String args[]) throws Exception {
        final Score score = new Score();
        score.maxScore = 1;

        System.out.println("Initial maxScore: " + score.maxScore);

        Thread student = new Thread() {

            @Override
            public void run() {
                score.maxScore++;
            }
        };

        student.start();
        student.join(); // waiting for thread to finish

        System.out.println("Result maxScore: " + score.maxScore);
    }
}