我有以下代码:importjava.io.*;importjava.util.concurrent.*;publicclassExample{publicstaticvoidmain(Stringargs[]){try{FileOutputStreamfos=newFileOutputStream("1.dat");DataOutputStreamdos=newDataOutputStream(fos);for(inti=0;ifuture1=executor.submit(ex1);Futurefuture2=executor.submit(ex2);intcount1=future