Letter Counting

import javax.swing.JOptionPane;
public class LetterCounting
{
    public static void main(String[] args)
    {
        //the inputted text
        String input = JOptionPane.showInputDialog("Enter your sentence(s).");
        //convert string to all lowercase
        input = input.toLowerCase();
        //integers of the number of each of the 26 letters of the alphabet
        int a = 0;
        int b = 0;
        int c = 0;
        int d = 0;
        int e = 0;
        int f = 0;
        int g = 0;
        int h = 0;
        int i = 0;
        int j = 0;
        int k = 0;
        int l = 0;
        int m = 0;
        int n = 0;
        int o = 0;
        int p = 0;
        int q = 0;
        int r = 0;
        int s = 0;
        int t = 0;
        int u = 0;
        int v = 0;
        int w = 0;
        int x = 0;
        int y = 0;
        int z = 0;
        //integer created for the length of characters in the sentence
        int length = input.length();
        //for statement that keeps running for the entire length of the sentence
        for(int ix =0; ix<length; ix++)
        {
            //if statements asking for each letter, and if that letter is present increases the value of the letter integer
            if(input.charAt(ix)=="a".charAt(0))
            {
                a++;
            }
            if(input.charAt(ix)=="b".charAt(0))
            {
                b++;
            }
            if(input.charAt(ix)=="c".charAt(0))
            {
                c++;
            }
            if(input.charAt(ix)=="d".charAt(0))
            {
                d++;
            }
            if(input.charAt(ix)=="e".charAt(0))
            {
                e++;
            }
            if(input.charAt(ix)=="f".charAt(0))
            {
                f++;
            }
            if(input.charAt(ix)=="g".charAt(0))
            {
                g++;
            }
            if(input.charAt(ix)=="h".charAt(0))
            {
                h++;
            }
            if(input.charAt(ix)=="i".charAt(0))
            {
                i++;
            }
            if(input.charAt(ix)=="j".charAt(0))
            {
                j++;
            }
            if(input.charAt(ix)=="k".charAt(0))
            {
                k++;
            }
            if(input.charAt(ix)=="l".charAt(0))
            {
                l++;
            }
            if(input.charAt(ix)=="m".charAt(0))
            {
                m++;
            }
            if(input.charAt(ix)=="n".charAt(0))
            {
                n++;
            }
            if(input.charAt(ix)=="o".charAt(0))
            {
                o++;
            }
            if(input.charAt(ix)=="p".charAt(0))
            {
                p++;
            }
            if(input.charAt(ix)=="q".charAt(0))
            {
                q++;
            }
            if(input.charAt(ix)=="r".charAt(0))
            {
                r++;
            }
            if(input.charAt(ix)=="s".charAt(0))
            {
                s++;
            }
            if(input.charAt(ix)=="t".charAt(0))
            {
                t++;
            }
            if(input.charAt(ix)=="u".charAt(0))
            {
                u++;
            }
            if(input.charAt(ix)=="v".charAt(0))
            {
                v++;
            }
            if(input.charAt(ix)=="w".charAt(0))
            {
                w++;
            }
            if(input.charAt(ix)=="x".charAt(0))
            {
                x++;
            }
            if(input.charAt(ix)=="y".charAt(0))
            {
                y++;
            }
            if(input.charAt(ix)=="z".charAt(0))
            {
                z++;
            }
        }
        //Prints out all the letters
        System.out.println("a:" + a);
        System.out.println("b:" + b);
        System.out.println("c:" + c);
        System.out.println("d:" + d);
        System.out.println("e:" + e);
        System.out.println("f:" + f);
        System.out.println("g:" + g);
        System.out.println("h:" + h);
        System.out.println("i:" + i);
        System.out.println("j:" + j);
        System.out.println("k:" + k);
        System.out.println("l:" + l);
        System.out.println("m:" + m);
        System.out.println("n:" + n);
        System.out.println("o:" + o);
        System.out.println("p:" + p);
        System.out.println("q:" + q);
        System.out.println("r:" + r);
        System.out.println("s:" + s);
        System.out.println("t:" + t);
        System.out.println("u:" + u);
        System.out.println("v:" + v);
        System.out.println("w:" + w);
        System.out.println("x:" + x);
        System.out.println("y:" + y);
        System.out.println("z:" + z);
    }
}