java使用 Runtime.getRuntime().addShutdownHook来接受关闭程序的信号，示例代码如下：
import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class test {static final int MAX_T = 3;static ExecutorService pool = Executors.newFixedThreadPool(MAX_T);public static void main(String[] args) {pool.execute(() -> {System.out.println("new thread");});Runtime.getRuntime().addShutdownHook(new Thread() {public void run() {pool.shutdown();System.out.println("pool shutdown success.");System.out.println("Exited!");}});}}
如果使用lamdba 表达式，可以更简洁：
Runtime.getRuntime().addShutdownHook(new Thread(() -> {pool.shutdown();System.out.println("pool shutdown success.");System.out.println("Exited!");}));
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