Java中的链接映射,如果键的顺序不同,则不相等

问题描述 投票:2回答:1

Java或第三方库中是否有一个Map保留插入顺序(类似于LinkedHashMap),该顺序还将在比较过程中检查键的顺序(equals()hashCode()方法)?这样Map(a => 1, b => 2)将不同于Map(b => 2, a => 1)

类似于下面,但我不想重新发明和维护方向盘:

public class EqualityStrictLinkedMap<K, V> extends ForwardingMap<K, V>
{
    ...

    @Override
    public boolean equals(Object o)
    {
        if (!(o instanceof Map))
            return false;
        Map<K, V> that = (Map<K, V>) o;
        return Iterables.elementsEqual(entrySet(), that.entrySet());
    }

    @Override
    public int hashCode()
    {
        int h = 1;
        for (Map.Entry<K, V> entry: entrySet()) {
            h = (h*31 + Objects.hashCode(entry.getKey()))*31 + Objects.hashCode(entry.getValue());
        }
        return h;
    }
}
java linkedhashmap
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