int teller = 0;
for(int i = 0; i < somestring.length; i++) {
if(somestring.charAt(i).equals("X")) teller++;
}
system.out.println("X: " + teller);
}

public class test {
	public static void main(String[] args) {
		String somestring = "xxXXaaaaaX";
		int teller = 0;
		for(int i = 0; i < somestring.length(); i++) {
		if(somestring.toUpperCase().charAt(i) == 'X') teller++;
		}
		System.out.println("X: " + teller);
	}
}

import java.util.Scanner;
public class test {
	public static void main(String[] args) {		
		Scanner in = new Scanner(System.in);
		System.out.print("Verdi: ");
		String input = in.nextLine();
		
		int teller = 0;
		for(int i = 0; i < input.length(); i++) {
			if(input.substring(i, (i + 1)).toUpperCase().equals("X")) teller++;
		}
		System.out.println("X: " + teller);
	}
}

import java.util.Scanner;

public class Test
{
    public static void main(String[] args)
    {        
        Scanner in = new Scanner(System.in);
        System.out.print("Streng: ");
        String input = in.nextLine().toLowerCase();

        char[] cArray = input.toCharArray();

        char[] c = {'a','b','c','d','e','f','g','h','i',
                    'j','k','l','m','n','o','p','q','r',
                    's','t','u','v','w','x','y','z','æ',
                    'ø','å'};
    
        int[] frekvens = new int[29];
        
        for (int i = 0; i < cArray.length; i++)
            {
                for (int j = 0; j < c.length; j++)
                    {
                        if (cArray[i] == c[j])
                            frekvens[j]++;
                    }
            }

        for (int i = 0; i < c.length; i++)
            {
                System.out.printf("%c: %d\n", c[i], frekvens[i]);
            }
    }
}

 
 int teller3= 0;
  int teller2 = 0;
  int teller = 0;
  
  for(int i = 0; i < input.length(); i++) {
   if(input.substring(i, (i + 1)).toUpperCase().equals("Æ")) teller++;
      if(input.substring(i, (i + 1)).toUpperCase().equals("Ø")) teller2++;
      if(input.substring(i, (i + 1)).toUpperCase().equals("Å")) teller2++;

  }
  System.out.println("X: " + teller);
  System.out.println("Æ: " + teller2);
  System.out.println("Å: " + teller3);
 }

    for(int i = 0; i < input.length(); i++) 
      
{
      
      if(input.substring(i, (i + 1)).toUpperCase().equals("X")) teller++; //Test
 System.out.println("x: " + teller3);
  }

 for(int i = 0; i < input.length(); i++)

public class CountChars {
	public static void main(String[] args) {
		TreeMap<Character, Integer> charCount = new TreeMap<Character, Integer>();
		Scanner input = new Scanner(System.in);
		
		while(true) {
			// Prompt for sentences
			System.out.print("String: ");
			// Get input
			String line = input.nextLine().toLowerCase();
			// Validate - break out of the input loop
			if(line.length() == 0)
				break;
			// Iterate over the characters in the line entered
			for(char c : line.toCharArray()) {
				// Add the character to the hashmap
				charCount.put(c,  charCount.get(c) != null ? charCount.get(c) + 1 : 1);
			}
		}
		// Display statistics
		for(Character c : charCount.keySet()) {
			System.out.println(c.charValue() + ": " + charCount.get(c));
		}
	}
}

String: java
String: er
String: gøy
String: 
a: 2
e: 1
g: 1
j: 1
r: 1
v: 1
y: 1
ø: 1

public class CountCharsArray {
	public static void main(String[] args) {
		int[] charCount = new int[255];
		Scanner input = new Scanner(System.in);
		
		while(true) {
			// Prompt for input
			System.out.print("String: ");
			// Get input, convert to lowercase and remove whitespaces
			String line = input.nextLine().toLowerCase().replaceAll(" ", "");
			// Validate
			if(line.length() == 0)
				break;
			// Loop through the characters in the line
			for(int i = 0; i < line.length(); i++) {
				charCount[(int)line.charAt(i)]++;
			}
		}
		// Display statistics
		for(int i = 0; i < charCount.length; i++) {
			// Skip character counters that are still set to 0
			if(charCount[i] == 0)
				continue;
			System.out.println((char)i + ": " + charCount[i]);
		}
	}
}