java - 减少表达式中使用的条件运算符 (4) 的数量(最多允许 3 个)

Question

如何降低运算符的复杂性？我有一个条件问题。

Object someObject = getSomeObject();
boolean isNotInstanceOfA = !(someObject instanceof A);
boolean isNotInstanceOfB = !(someObject instanceof B);
boolean isNotInstanceOfC = !(someObject instanceof C);
boolean isNotInstanceOfABC = isNotInstanceOfA && isNotInstanceOfB && isNotInstanceOfC;
if (isNotInstanceOfABC && (container.getChildren(itemId) == null || container.getChildren(itemId).isEmpty())) {
    return "something";
 }

Answer 1

itemId 是否是原始类型？ 我猜它不是原始类型，为了减少代码，您可以将此 null 或空检查移动到一个单独的方法并返回一个 boolean 值..然后你也可以像这样减少一些代码:`

    boolean isNotInstanceOfABC = !(someObject instanceof A) && !(someObject instanceof B) && !(someObject instanceof C);

    if (isNotInstanceOfABC && isEmptyOrNull(container.getChildren(itemId))) {
        return "something";
    }`