java 多线程获取返回值

FutureTask<实体类> futureTask = new FutureTask<>(() -> {
    return 实体类;
});
new Thread(futureTask).start();
for(;;){
    if (futureTask.isDone()) {
        try {
            实体类=futureTask.get();
            break;
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }
}