Parsing many Ints from a user input String.

I'm writing a java program that takes an input from a user as a string. Then has to take that random string and parse all of the ints in order and put them into an array. I have to have a method with the only input as the string that returns the int array, which is where I'm having trouble.

In the method I have a string array set up first to the length of the array. And I have a counter. I have a for loop that has (int a = 0; a <= string.length; a++) I check if charAt(a) = a number, if so I make stringArray[count] = stringArray[count]+charAt(a), if not i check if a = 0, and if so do nothing, last I check if the charAt(a-1) is a number, if so I increase the counter. After I have the string array completed I make my int array with length of my counter then I have a for loop one more time that has (int b = 0; b <= cnt; b++) and for intArray[b] I parseInt StringArray[b]. what am I doing wrong it keeps giving me errors like stringindex out of bounds or numberformat exception.

Here is my method code;

public static int[] intParse(String s)
{

String[] placeKeeper = new String[s.length()];

for (int a = 0; a < s.length(); a++)
{
placeKeeper[a] = "";
}

int cnt = 0;
for (int a = 0; a <= s.length(); a++)
{
if (s.charAt(a) == '1' || s.charAt(a) == '2' || s.charAt(a) == '3' || s.charAt(a) == '4' || s.charAt(a) == '5' || s.charAt(a) == '6' || s.charAt(a) == '7' || s.charAt(a) == '8' || s.charAt(a) == '9' || s.charAt(a) == '0')
{
placeKeeper[cnt] = placeKeeper[cnt] + s.charAt(a);
}

else if (a == 0)
{
}
else if (s.charAt(a-1) == '1' || s.charAt(a-1) == '2' || s.charAt(a-1) == '3' || s.charAt(a-1) == '4' || s.charAt(a-1) == '5' || s.charAt(a-1) == '6' || s.charAt(a-1) == '7' || s.charAt(a-1) == '8' || s.charAt(a-1) == '9' || s.charAt(a-1) == '0')

{
cnt ++;
}

} //end for loop

int[] array = new int[cnt];
for (int b = 0; b <= cnt; b++)
{
array[b] = Integer.parseInt(placeKeeper[b]);
}

return array;
}