我有一个简单的JAVA代码,它将在编译和运行程序后打印hello。但是我想在成功完成后打印一条消息。这可能吗?如果是,那么?
答案 0 :(得分:1)
虽然,以下代码片段对您的任务来说太过分了,但是,扩展我的评论 - 您可能想要向类提交自定义任务 它实现了Callable。
public class Main {
public static void main(String[] args) {
final ExecutorService executorService;
final Future<Integer> future;
final int statusCode;
executorService = Executors.newFixedThreadPool(1);
future = executorService.submit(new TextMessagePrinter());
try {
statusCode = future.get();
if (statusCode == 10) { // Printed successfully
System.out.println("JOB DONE. EXITING...");
Runtime.getRuntime().exit(0); // A zero status code indicates normal termination.
} else {
System.out.println("ERR...SOMETHING WEIRD HAPPENED!");
Runtime.getRuntime().exit(statusCode); // A non-zero status code indicates abnormal termination.
}
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
} finally {
executorService.shutdownNow();
}
}
}
class TextMessagePrinter implements Callable<Integer> {
public Integer call() {
Integer STATUS_CODE;
try {
System.out.println("Printing hello..."); // Try printing something
System.out.println("Dividing 6 by 0 gives us: " + 6 / 0); // And then you try to do something knowing which will result in an exception
STATUS_CODE = 10; // Indicates success.
} catch (ArithmeticException e) {
STATUS_CODE = 20; // Indicates failure...setting status code to 20.
}
return STATUS_CODE;
}
}
在我的IDE上运行上面的代码给出了以下输出:
(请注意,当流程完成时,在catch块中设置的状态代码会被打印):
(评论以下一行)
System.out.println("Dividing 6 by 0 gives us: " + 6 / 0);
答案 1 :(得分:0)
如果您的意思是完成了应用程序的运行时,我认为您正在寻找StackOverflow问题中的答案:Java Runtime Shutdown Hook。
或者,如果您想要执行问题标题中的内容并在构建后执行某些操作,那么您可以考虑使用构建自动化工具,例如Maven。