i have a couple of questions on java for my homework 21229 Assume the availabili

Question

i have a couple of questions on java for my homework

21229

Assume the availability of a method  named  makeLine that can be passed a non-negative integer  n and a character  c and return a String consisting of n identical characters that are all equal to c. Write a method  named  printTriangle that receives two integer  parameters  n andk. If n is negative the method does nothing. If n happens to be an even number, its value is raised to the next odd number (e.g. 4-->5). Then, when k has the value zero, the method prints a SYMMETRIC triangle of O's (the capital letter O) as follows: first a line of n O, followed by a line of n-2 O's (indented by one space), and then a line of n-4 O's (indented by two spaces), and so on. For example, if the method received 5,0 (or 4,0) it would print:
OOOOO
  OOO
     O

Note: in the above output , the first line contains 0 spaces before the first O, the next line 1 space, and so on.

Note: These instructions state what the method does when k is zero, but it is up to you, the programmer, to determine what it does when k is not zero and use it for your advantage.

The method must not use a loop of any kind (for, while, do-while) to accomplish its job. The method should invoke makeLine to accomplish the task of creating Strings of varying lengths.

20861

A palindrome is a string that reads the same forwards or backwards; for example dad, mom, deed (i.e., reversing a palindrome produces the same string ). Write a recursive, boolean -valued  method , isPalindrome that accepts a string and returns whether the string is a palindrome.
A string , s, is a palindrome if:

20864

A 'array palindrome' is an array which, when its elements are reversed, remains the same (i.e., the elements of the array are same when scanned forward or backward) Write a recursive, boolean -valued  method , isPalindrome, that accepts an integer -valued  array , and a pair ofintegers representing the starting and ending indexes of the portion of the array to be tested for being a palindrome. The function returnswhether that portion of the array is a palindrome.
An array is a palindrome if:

Explanation / Answer

public void printTriangle(int n, int k){
if(n < 0)
return;
if(n % 2 == 0)
n++;
if(k <= n || n ==1 ){
System.out.println(makeLine(k, ' ')+ makeLine(n, 'O'));
printTriangle(n-2, k+1);
}
}

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