我发现在《Java编程思想》第四版的第14章中有这个例子:
public class CoffeeGenerator
implements Generator<Coffee>, Iterable<Coffee> {
private Class[] types = { Latte.class, Mocha.class,
Cappuccino.class, Americano.class, Breve.class, };
private static Random rand = new Random(47);
public CoffeeGenerator() {}
private int size = 0;
public CoffeeGenerator(int sz) { size = sz; }
public Coffee next() {
try {
return (Coffee)
types[rand.nextInt(types.length)].newInstance();
} catch(Exception e) {
throw new RuntimeException(e);
}
}
class CoffeeIterator implements Iterator<Coffee> {
int count = size;
public boolean hasNext() { return count > 0; }
public Coffee next() {
count--;
return CoffeeGenerator.this.next();
}
public void remove() {
throw new UnsupportedOperationException();
}
};
public Iterator<Coffee> iterator() {
return new CoffeeIterator();
}
}
我注意到我从未遇到过这种结构:
return CoffeeGenerator.this.next();
这是什么意思?我知道 ClassName.class.Method(),但这是什么意思?