如何操作一组随机字母？

Question

I have an array of size 1000 that holds upper case letters and lower case letters of the entire alphabet.

How would i print the total number of lower case letters generated and the total number of upper case letters generated?

ALSO

A count of how many of each letter were generated (showing the letter and how many were generated) as well as the percent of the total that letter represents.

Answer 1

Try this:

int lower = 0;
int upper = 0;
Map<Character, Integer> letterCounter = new TreeMap<>();

for (char letter : letterArr) { //Might need to use String if letterArr is String[]
   if (Character.isLowerCase(letter)) lower++;
   if (Character.isUpperCase(letter)) upper++;
   Integer count = letterCounter.get(letter);
   if (count != null) count++;
   else letterCounter.put(letter, new Integer(1));
}

System.out.println("Number of upper case letters: " + upper);
System.out.println("Number of lower case letters: " + lower);

for (Map.entry<Character, Integer> e : letterCounter.entrySet()) {
   System.out.println("Number of " + e.getKey() + " = " + e.getValue());
}