您可以使用工厂方法
class A {
final B b;
A(B b) {
this.b = b;
}
}
abstract class B {
final A a;
B() {
this.a = constructA();
}
protected abstract A constructA();
}
public class C {
public static void main(String []args){
new B(){
protected A constructA(){
return new A(this);
}
};
}
}
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