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Functional Java is an open source library that supports closures for the Java programming language

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package fj;

import fj.function.Effect0;
import fj.function.Try0;
import fj.function.TryEffect0;

import java.util.function.Supplier;

@FunctionalInterface
public interface F0 extends Supplier {

    A f();

    default A get() {
        return f();
    }

    default Effect0 toEffect0() {
        return () -> f();
    }

    default  TryEffect0 toTryEffect0() {
        return () -> f();
    }

    default  Try0 toTry0() {
        return () -> f();
    }

    default P1 toP1() {
        return P.lazy(() -> f());
    }

}