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在Java中,如何覆蓋繼承類中變量的類類型?例如:在Java中,如何重寫繼承類中變量的類類型?
class Parent {
protected Object results;
public Object getResults() { ... }
}
class Child extends parent {
public void operation() {
... need to work on results as a HashMap
... results.put(resultKey, resultValue);
... I know it is possible to cast to HashMap everytime, but is there a better way?
}
public HashMap getResults() {
return results;
}
而不是'Object',你不能用'Map'返回類型? – Sujay