练习22

public class BookCase {
public static void main(String[] args) {
String[][] bookshelf = new String[3][2];
bookshelf[0][0] = "历史类读物";
bookshelf[1][0] = "经济类读物";
bookshelf[1][1] = "科学类读物";
System.out.println("向该书柜第1层第1列放入" + bookshelf[0][0]);
System.out.println("向该书柜第2层第1列放入" + bookshelf[1][0]);
System.out.println("向该书柜第2层第2列放入" + bookshelf[1][1]);
}
}