securitygate.java

来自「多线程与并发处理是程序设计好坏优劣的重要课题」· Java 代码 · 共 13 行

public class SecurityGate {
    private int counter;
    public void enter() {
        counter++;
    }
    public void exit() {
        counter--;
    }
    public int getCounter() {
        return counter;
    }
}