java - Java Stream-筛选器列表时为NullPointExeption

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What is a NullPointerException, and how do I fix it?
                                
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                                9个月前关闭。
            
                    
我试图从字段isActive设置为N或null的列表对象中过滤掉。不幸的是，我在方法过滤器中得到了NullPointerException，我不知道这是怎么回事？

码：

...
return dictionary.getAllPermissions().stream()
            .filter(Objects::nonNull)
            .filter(z->"N".equals(z.getIsActive().toString()) || z.getIsActive().equals(null)) //field isActive is Character
            .collect(Collectors.toList());

最佳答案

您的订购错了，应该是：

.filter(z -> z.getIsActive() == null || "N".equals(z.getIsActive().toString()))