Dart单例模式
2020-12-16 本文已影响0人
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class A {
static A _instance;
A._internal();
factory A() {
if (_instance == null) {
_instance = A._internal();
}
return _instance;
}
}
class A {
static A _instance;
A._internal();
factory A() {
if (_instance == null) {
_instance = A._internal();
}
return _instance;
}
}