Java Stream - 如何使用Objects :: nonNull作為謂詞的方法引用

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import java.util.Objects;
import java.util.function.Predicate;
public class Main {
  public static void main(String... args) {
    Predicate<Boolean> nonNull = Objects::nonNull;
    System.out.println(nonNull.test(true));
    System.out.println(nonNull.negate().test(false));
  }
}
 
 
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