如何使用构造函数进行java静态数组初始化？

Question

我有下面的类,下面列出了数组的静态字段.您能否告诉/解释如何创建构造函数来初始化所有数组并将其传递给public static void BookInfo方法.任何帮助是极大的赞赏!

  public class BookInfo {

    // Global arrays accessible by all methods
public static String[] isbnInfo = {

        "978-0060014018",
        "978-0449221431",
        "978-0545132060",
        "978-0312474881",
        "978-0547745527"

      };


public static String[] bookTitleInfo = {

            "The Greatest Stories",
            "The Novel",
            "Smile",
            "The Bedford Introduction to Drama",
            "AWOL on the Appalachian Trail"

           };

public static String[] authorInfo = {

         "Rick Beyer",
         "James A. Michener",
         "Raina Telgemeier",
         "Lee A. Jacobus",
         "David Miller"

        };

public static String[] publisherInfo = {

            "HerperResource",
            "Fawcett",
            "Graphix",
            "Bedford St. Martins",
            "Mariner Books"

            };

public static String[] dateAddedInfo = {

            "05/18/2003", 
            "07/07/1992", 
            "02/01/2010", 
            "09/05/2008", 
            "11/01/2011"

            };

public static int[] qtyOnHandInfo = {7, 5, 10, 2, 8};

public static double[] wholesaleInfo = {12.91, 7.99, 6.09, 54.99, 10.17};

public static double[] retailInfo = {18.99, 3.84, 4.90, 88.30, 14.95};

public static void BookInfo() {

    System.out.println("             Serendipity Booksellers");
    System.out.println("                Book Information\n");       


    for(int i = 0; i < isbnInfo.length; i++){

        System.out.println("ISBN: " + isbnInfo[i]);
        System.out.println("Title: " + bookTitleInfo[i]);
        System.out.println("Author: " + authorInfo[i]);
        System.out.println("Publisher: " + publisherInfo[i]);
        System.out.println("Date Added: " + dateAddedInfo[i]);
        System.out.println("Quantity-On-Hand: " + qtyOnHandInfo[i]);
        System.out.println("Wholesale Cost: $ " + wholesaleInfo[i]);
        System.out.println("Retail Price: $ " + retailInfo[i]);
        System.out.println();

         }
            }
    }

Answer 1

你想要做的是使用static块.在运行任何其他代码之前static初始化数据.在当一个对象实例化和它们被称为只调用每一个该类型的对象实例,以及时间,应用程序运行时初始化一次.constructorstatic

public static final String[] ISBN_INFO; 

static 
{ 

    BookInfo.ISBN_INFO = {
    "978-0060014018",
    "978-0449221431",
    "978-0545132060",
    "978-0312474881",
    "978-0547745527" }; 

  // do the same thing with the other blocks

}

制作static变量也是一个好主意final.