????Runnable????й?????????????????????????κ?????????????????????????????????????????????Callable????????Runnable??????Java SE5???????Callable???????????????????????????????????????????call()?з?????????????????ExecutorService.submit()????????????
import java.util.ArrayList;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
public class TaskWithResult implements Callable<String> {
private int id;
public TaskWithResult(int id){
this.id = id;
}
@Override
public String call() throws Exception {
return "result of TaskWithResult" + id;
}
public static void main(String[] args) {
ExecutorService exec = Executors.newCachedThreadPool();
ArrayList<Future<String>> results = new ArrayList<Future<String>>();
for(int i = 0;i<10;i++){
results.add(exec.submit(new TaskWithResult(i)));
}
for(Future<String> fs : results){
try {
//???Future?????????
System.out.println(fs.isDone());
//??????
System.out.println(fs.get());
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
exec.shutdown();
}
}
}
}

????submit()?????????Future????????Callable??????????????????????????????????isDone()?????????Future????????ɡ???????????????????????????????????get()??????????y??????????????isDone()???м????????get()????????????￡?get()?????????????????????