String manipulation

Question 1

How do you split a sentence (ie., “My name is Bob”) by a space?

Answer 1

String s = “My name is Bob”;
String[] words = s.split(“ “);

Question 2

If you have int[] numbers = { 1, 2, 3 }; what built in method can you used to sort it?

Answer 2

Arrays.sort(numbers);

Question 3

If you have int[] array1 = { 1, 2, 3 }; and int[] array2 = { 1, 2, 3 };

What built in method can you use to check the 2 arrays are equal?

Answer 3

Arrays.equal(array1, array2);

Question 4

How do you represent a int[] as a List<Integer>?</Integer>

Answer 4

int[] numbers = {1,2,3};
List<Integer> list = Arrays.asList(numbers);</Integer>

Question 5

How can you use a built in Collections method to sort List<Integer> list = Arrays.asList(numbers);?</Integer>

Answer 5

Collections.sort(list);

Question 6

How can you use a built in Collections method to reverse List<Integer> list = Arrays.asList(numbers);?</Integer>

Answer 6

Collections.reverse(list);

Question 7

How do you check if a string contains vowels?

Answer 7

1. Store the vowels as a String vowels = “aeiou”
2. Loop through each char in s.toCharArray()
3. and check if vowels.contains(String.valueOf(char))
4. if it does increment the counter
5. return the counter