当用户关闭计算器时,如何打印消息?

您可以使用中的代码定期检查进程是否仍在运行 this answer ,然后在缺少进程时发布消息。在Windows 10上,您要查找的进程是 Calculator.exe .

以下是Java 8检查进程是否正在运行的方法:

private static boolean processIsRunning(String processName) throws IOException {

    String taskList = System.getenv("windir") + "\\system32\\tasklist.exe";
    InputStream is = Runtime.getRuntime().exec(taskList).getInputStream();

    try (BufferedReader br = new BufferedReader(new InputStreamReader(is))) {
        return br
            .lines()
            .anyMatch(line -> line.contains(processName));
    }

}

然后你可以等待 processIsRunning("Calculator.exe") 这是真的。

下面是一个快速而肮脏的实现:

public static void main(String[] args) throws Exception {
    Runtime.getRuntime().exec("calc.exe").waitFor();
    while (processIsRunning("Calculator.exe")) {
        Thread.sleep(1000); // make this smaller if you want
    }
    System.out.println("Program has been closed successfully");
}