Java 从父对象创建子对象的最佳方法
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Best way to create a child object from its parent
提问by Molly
Which is the best way to create a child given a parent with data? Would it be ok to have a method with all parents values on the child class as:
给定具有数据的父级，哪个是创建子级的最佳方法？有一个方法可以将子类上的所有父值设置为：
public class Child extends Person {
public Child(Parent p) {
this.setParentField1(p.getParentField1());
this.setParentField2(p.getParentField2());
this.setParentField3(p.getParentField3());
// other parent fields.
}
}
to copy parent data ti child object?
复制父数据ti 子对象？
Child child = new Child(p);
回答by Kevin Bowersox
I would recommend creating a constructor in the parent class that accepts an object of type Parent.
我建议在接受类型为 的对象的父类中创建一个构造函数Parent。
public class Child extends Parent {
public Child(Parent p) {
super(p);
}
}
public class Parent {
public Parent(Parent p){
//set fields here
}
}
回答by F.O.O
Much simpler is
更简单的是
public class Child extends Parent {
public Child(Parent p) {
//Set fields with parent
}
}
Your child object always has access to its parent's fields given the appropriate access modifiers are in place.
给定适当的访问修饰符，您的子对象始终可以访问其父对象的字段。
