java pair提高效率

最新推荐文章于 2024-10-20 18:08:58 发布

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最新推荐文章于 2024-10-20 18:08:58 发布

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本文链接：https://blog.youkuaiyun.com/wwwxxdddx/article/details/8995468

本文介绍了一个用于创建成对元素的通用Pair类。该类支持任意两种类型的组合，并提供了构造函数、toString方法、equals方法及hashCode方法实现。此外还提供了一个静态工厂方法of方便Pair实例的创建。

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/** A generic class for pairs.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class Pair<A, B>
{

    public final A fst;

    public final B snd;

    public Pair(A fst, B snd)
    {
        this.fst = fst;
        this.snd = snd;
    }

    public String toString()
    {
        return "Pair[" + fst + "," + snd + "]";
    }

    private static boolean equals(Object x, Object y)
    {
        return (x == null && y == null) || (x != null && x.equals(y));
    }

    public boolean equals(Object other)
    {
        return other instanceof Pair<?, ?> && equals(fst, ((Pair<?, ?>)other).fst)
            && equals(snd, ((Pair<?, ?>)other).snd);
    }

    public int hashCode()
    {
        if (fst == null)
            return (snd == null) ? 0 : snd.hashCode() + 1;
        else if (snd == null)
            return fst.hashCode() + 2;
        else
            return fst.hashCode() * 17 + snd.hashCode();
    }

    public static <A, B> Pair<A, B> of(A a, B b)
    {
        return new Pair<A, B>(a, b);
    }
}