无法在 Java 中的 Object 数组上使用 Stream 方法

Question

        User user =list.stream()
                .filter(user -> id.equals(user.getUsername()))
                .findFirst()
                .orElse(null);
    
        return user;
    }

The type java.util.stream.Stream cannot be resolved. It is indirectly referenced from required type java.util.Arrays

I want filter from array of objects using a username.

Answer 1

You're using the stream() method used for Collections on an Array . You should use Arrays.stream(arr) instead.

So your code should be:

User user = Arrays.stream(list)
    .filter(user -> id.equals(user.getUsername()))
    .findFirst()
    .orElse(null);