Question

在java中新建一个book_practice工程，包含book类的概要部分

Answer 1

public class Book {
private String title;
private int pageNum;
private String type;

public Book(String title, int pageNum) {
this.type = "计算机";
this.pageNum = pageNum;
this.title = title;
}

public Book(String title, int pageNum, String type) {
this.title = title;
this.pageNum = pageNum;
this.type = type;
}

void detail()
{
System.out.println(this.title+","+this.pageNum+","+this.type);
}
}

public class BookTest {
public static void main(String[] args) {
Book book1 = new Book("高等数学",123,"数学");
Book book2 = new Book("Java编程",32);
book1.detail();
book2.detail();
}
}

Answer 2

类的概要部分是什么部分，请用专业点的术语