java - 构造函数未定义

Question

我收到一条错误消息，说我的构造函数 Book(String, int) 在我的 Dictionary 类中未定义。我检查了其他所有内容并尝试重做我的程序仍然有错误。有解决这个问题的解决方案吗？

图书类别:

public class Book{
    private String author;
    private int numPages;

    public Book(int code, String title, double price, int quantity, String author, int numPages){
        this.author = author;
        this.numPages = numPages;
    }

    //Getters
    public String getAuthor(){
        return this.author;
    }
    public int getNumPages(){
        return this.numPages;
    }

    //Setters
    public void setAuthor(String author){
        this.author = author;
    }
    public void setNumPages(int numPages){
        this.numPages = numPages;
    }

    //toString
    @Override
    public String toString(){
        String outputBookDes = "";
        outputBookDes += "Author: "+ this.author;
        outputBookDes += "Number Pages: "+ this.numPages;
        return outputBookDes;
    }
}

字典类:

public class Dictionary extends Book{
private String language;
private int numDefinitions;

public Dictionary(String author, int numPages, String language, int numDefinitions){
    super(author,numPages);
    this.language = language;
    this.numDefinitions = numDefinitions;
}

// Getters
public String getLanguage(){
    return this.language;
}
public int getNumDefinitions(){
    return this.numDefinitions;
}

//Setters
public void setLanguage(String language){
    this.language = language;
}
public void setNumDefinitions(int numDefinitons){
    this.numDefinitions = numDefinitions; 
}

//Ratio method
public double getRatio(){
    double ratioTotal = this.numDefinitions / getNumPages();
    return ratioTotal;
}

}

Answer 1

当你打电话时

super(author,numPages);

在子类字典中，
您需要在 Book 类中定义另一个构造函数，例如

public Book(String author,int numPages) {
     this.author = author;
     this.numPages = numPages;
}  

解决此错误。