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package java.util.function;

import java.util.Objects;

@FunctionalInterface
public interface Predicate {
	boolean test(T t);

	default Predicate and(Predicate that) {
		return null;
	}
	default Predicate negate() {
		return null;
	}
	default Predicate or(Predicate that) {
		return null;
	}
	static  Predicate isEqual(Object targetRef) {
		return null;
	}

	/*
	default Predicate and(Predicate that) {
		Objects.requireNonNull(that);
		return (t) -> test(t) && that.test(t);
	}
	default Predicate negate() {
		return (t) -> !test(t);
	}
	default Predicate or(Predicate that) {
		Objects.requireNonNull(that);
		return (t) -> test(t) || that.test(t);
	}
	static  Predicate isEqual(Object targetRef) {
		return (targetRef != null) ? object -> targetRef.equals(object) : Objects::isNull;
	}
	*/
}