密钥匹配，但Get/ContainsKey找不到

Question

TransitionKey current  = new TransitionKey(this.currentState, inputSymbol);
    for(TransitionKey tk: transitions.keySet()) {
        System.out.println(tk.equals(current)); // True (only one key in table)
        System.out.println(transitions.containsKey(current)); // false
        String value = transitions.get(tk).toString(); // null
    }

在TransitionKey类中：

    /**
* @override
*/
public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof TransitionKey)) return false;
    TransitionKey transitionKey = (TransitionKey) o;
    return (state.equals(transitionKey.state)) && (symbol==transitionKey.symbol);
}

/**
* @override
*/
public int hashcode() {
    int result = (int)symbol;
    result = result*31 + state.hashCode();
    return result;
}

Answer 1

您没有重写hashcode，而是创建了一个新的hashcode方法（请注意C与C)。

将代码更改为

@Override
public int hashCode() {
    int result = (int)symbol;
    result = result*31 + state.hashCode();
    return result;
}

它应该能像预期的那样工作。