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36 lines (31 loc) · 854 Bytes
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// reuse/Cartoon.java
// (c)2020 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Constructor calls during inheritance
class Art {
Art() {
System.err.println("Art constructor");
}
}
class Drawing extends Art {
Drawing() {
System.err.println("Drawing constructor");
}
}
public class Cartoon extends Drawing {
// public Cartoon() {
// System.err.println("Cartoon constructor");
// }
public static void main(String[] args) {
Cartoon x = new Cartoon();
}
}
/* Output:
Art constructor
Drawing constructor
Cartoon constructor
self-note : 即使不为 Cartoon 创建构造函数，
编译器也会为你合成一个无参数构造函数，调用基类构造函数。
尝试删除 Cartoon 构造函数来查看这个。
*/