Miscellaneous

Question 1

What is the ‘instanceof’ keyword for?

Answer 1

You can use it to check the type of objects, like this:
if (object instanceof String)
System.out.print(“object is a string”);

Question 2

How can you read the input: “10 2 4 5 10” ?

Can you use input.nextInt(); ?

Answer 2

You can’t use .nextInt(), it will only get the first integer.
You CAN use input.nextLine(), which will read everything into a single string. You can later convert into integers if you wish

Question 3

How do you convert from String to int?

Answer 3

Integer.parseInt(str). For example:

int number = Integer.parseInt(“333”);

Question 4

What is the syntax of a ‘for-each’ loop?

Answer 4

for (double element: myList) {
System.out.println(element);
}
Iterating through a list like this is easier if all you need is the elements in the list.