完全可以,看下边的例子,摘自Think in Java,The 2nd Edition.
先定义一个接口:
interface Contents {
int value();
}
再定义一个类(构造函数不是默认的):
public class Wrapping {
private int i;
public Wrapping(int x) { i = x; }
public int value() { return i; }
}
先实现接口:
public class Parcel6 {
public Contents cont() {
return new Contents() {
private int i = 11;
public int value() { return i; }
}; // Semicolon required in this case
}
public static void main(String[] args) {
Parcel6 p = new Parcel6();
Contents c = p.cont();
}
}
再继承类:
public class Parcel7 {
public Wrapping wrap(int x) {
// Base constructor call:
return new Wrapping(x) {
public int value() {
return super.value() * 47;
}
}; // Semicolon required
}
public static void main(String[] args) {
Parcel7 p = new Parcel7();
Wrapping w = p.wrap(10);
}
}
更详细请看Think in Java,现在是The 3rd Edition. |