java.lang.IllegalStateException: stream has already been operated upon or closed
Stream 只能被使用一次 code DoubleStream ds = channelOrderList.stream().mapToDouble(o -> o.getPrincipal().doubleValue());
double sum = ds.sum();
long count = ds.count(); 因此代碼修改成ip double sum = channelOrderLis
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- 1. 【Java沒基礎】關於stream has already been operated upon or closed問題
- 2. ApplicationContext has been closed already
- 3. java.lang.IllegalStateException: getOutputStream() has already been called for
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