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This project contains a parser for the Checker Framework's stub files: https://checkerframework.org/manual/#stub . It is a fork of the JavaParser project.

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/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2024 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */
package com.github.javaparser.utils;

import static com.github.javaparser.utils.CodeGenerationUtils.f;

import java.util.Objects;

/**
 * Simply a pair of objects.
 *
 * @param  type of object a.
 * @param  type of object b.
 */
public class Pair {

    public final A a;

    public final B b;

    public Pair(A a, B b) {
        this.a = a;
        this.b = b;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Pair pair = (Pair) o;
        if (!Objects.equals(a, pair.a)) return false;
        if (!Objects.equals(b, pair.b)) return false;
        return true;
    }

    @Override
    public int hashCode() {
        int result = a != null ? a.hashCode() : 0;
        return 31 * result + (b != null ? b.hashCode() : 0);
    }

    @Override
    public String toString() {
        return f("<%s, %s>", a, b);
    }
}