无法实现构造函数(隐式超级构造函数Item()未定义)

Question

我正在尝试实现具有比父类更多参数的类的构造函数,唯一的共同点是标题.当我尝试在Book类中实现构造函数时,它向我显示错误"隐式超级构造函数Item()未定义".

public class Book extends Item {

private String author = "";
private String ISBN = "";
private String publisher = "";

public Book(String theTitle, String theAuthor, String theIsbn, String thePublisher){

}

}

父类构造函数;

public abstract class Item {

private String title;
private int playingTime;
protected boolean gotIt;
private String comment;

public Item(String title, int playingTime, boolean gotIt, String comment) {
    super();
    this.title = title;
    this.playingTime = playingTime;
    this.gotIt = gotIt;
    this.comment = comment;
}

提前致谢.

Answer 1

你的超类没有no-args默认构造函数,所以你必须使用super()关键字传递默认值来显式调用超类的重载构造函数.

public Book(String theTitle, String theAuthor, String theIsbn, String thePublisher){
super(thTitle,0,false,null)
}