[英]Switch between classes which implement a same interface
Let's say I have this code.假设我有这段代码。
public interface A {
public boolean move();
}
public class B implements A {
public boolean move() {
// do some stuff
// return true
}
}
public class C implements A {
public boolean move() {
// don't do anything
// return false
}
}
Can I do something like this?我可以做这样的事情吗?
B cell = new B();
// move() method will return True and will do some stuff
// now I'd like to change the B cell to C cell
// move() method will return False and won't do anything
Thanks for any help!谢谢你的帮助!
I hope the code should be enough.我希望代码应该足够了。
The trick is to use the interface (A) instead诀窍是改用接口 (A)
A cell = new B();
//or
//A cell = new C();
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