java stream 的 findFirst 及 findAny 方法遇到 null 元素时会出现 NullPointerException

deviant-ART2026-08-06 12:28

java 复制代码

Exception in thread "main" java.lang.NullPointerException
	at java.util.Objects.requireNonNull(Objects.java:203)
	at java.util.Optional.<init>(Optional.java:96)
	at java.util.Optional.of(Optional.java:108)
	at java.util.stream.FindOps$FindSink$OfRef.get(FindOps.java:193)
	at java.util.stream.FindOps$FindSink$OfRef.get(FindOps.java:190)
	at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464)

java 复制代码

Exception in thread "main" java.lang.NullPointerException
	at java.util.Objects.requireNonNull(Objects.java:203)
	at java.util.Optional.<init>(Optional.java:96)
	at java.util.Optional.of(Optional.java:108)
	at java.util.stream.FindOps$FindSink$OfRef.get(FindOps.java:193)
	at java.util.stream.FindOps$FindSink$OfRef.get(FindOps.java:190)
	at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.findAny(ReferencePipeline.java:469)