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With inspiration from other libraries

There is a newer version: 2.12.15

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
 *******************************************************************************
 * Copyright (C) 2011-2016, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.util;

/**
 * Simple struct-like class for output parameters.
 * @param  The type of the parameter.
 * @stable ICU 4.8
 */
public class Output {
    /**
     * The value field
     * @stable ICU 4.8
     */
    public T value;

    /**
     * {@inheritDoc}
     * @stable ICU 4.8
     */
    @Override
    public String toString() {
        return value == null ? "null" : value.toString();
    }

    /**
     * Constructs an empty Output
     * @stable ICU 4.8
     */
    public Output() {

    }

    /**
     * Constructs an Output with the given value.
     * @param value the initial value
     * @stable ICU 4.8
     */
    public Output(T value) {
        this.value = value;
    }
}