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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.data;

import fj.F;
import fj.Unit;
import fj.function.Try0;

import java.io.IOException;

/**
 * IO monad for processing files
 *
 * @author Martin Grotzke
 *
 * @param  the type of the result produced by the IO
 */
@FunctionalInterface
public interface IO extends Try0 {

	A run() throws IOException;

	default A f() throws IOException {
		return run();
	}

	default SafeIO> safe() {
		return IOFunctions.toSafeValidation(this);
	}

	default  IO map(F f) {
		return IOFunctions.map(this, f);
	}

	default  IO bind(F> f) {
		return IOFunctions.bind(this, f);
	}

	default  IO append(IO iob) {
		return IOFunctions.append(this, iob);
	}

	public static IO getContents() {
		return () -> IOFunctions.getContents().run();
	}

	public static IO interact(F f) {
		return () -> IOFunctions.interact(f).run();
	}

}