1. Using the String method charAt, write a loop that computes the number of words in the sentence given as the string sentence. 2. Write a loop that repeatedly asks for user input until a negative...

1. Using the String method charAt, write a loop that computes the number of words in the sentence given as the string sentence.

2. Write a loop that repeatedly asks for user input until a negative number is entered. Display each value entered and a farewell message when the loop ends.

3. What does the following loop display?

int n = 10;

while (n > 0)

{

System.out.println(n);

n = n - 3;

}