模拟future

　　

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java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero

at Thread.MyFuture$1.run(MyFuture.java:24)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.lang.ArithmeticException: / by zero

at Thread.MyFuture$3.call(MyFuture.java:69)

at Thread.MyFuture$1.run(MyFuture.java:22)

... 1 more