Question

java

True or False? in a two-dimensional array, the number of elements in each row must be the same for every row. True False QUESTIONS An ArrayList object reference of Book objects named books has already been declared. How do you instantiate it using the ArrayList default constructor? books = new ArrayList: books new Book(). books = new ArrayList<Book>(); books - new <Book>ArrayList();

Answer 1

7)
Answer:True
consider below example
int[][] arr = {{1, 2}, {3, 4, 5}};//here each row has different number of elements

8)
Answer:
books = new ArrayList<Book>();