问题：
解决：
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//FutureTaskTest.java //javac FutureTaskTest.java && java FutureTaskTest import java.util.concurrent.*; public class FutureTaskTest{ public static void main(String[] argv) throws Exception{ Callable<String> c = ()->{ try{Thread.sleep(1000);}catch(Exception e){} return "hello"; }; FutureTask<String> task = new FutureTask<>(c); new Thread(task).start(); System.out.println("wait for get.."); String ret = task.get(); System.out.println("get() return "+ret); } } ~ |
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