画柱状图Java

样例输入：
THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG.
THIS IS AN EXAMPLE TO TEST FOR YOUR
HISTOGRAM PROGRAM.
HELLO! 
样例输出：

                            *

                            *

        *                   *

        *                   *     *   *

        *                   *     *   *

*       *     *             *     *   *

*       *     * *     * *   *     * * *

*       *   * * *     * *   * *   * * * *

*     * * * * * *     * * * * *   * * * *     * *

* * * * * * * * * * * * * * * * * * * * * * * * * *

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

题目的意思是从命令行输入一个大写的字符串，求一个字符出现的频率，画出来。

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import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Arrays;    public class Main {        public static void main(String[] args) throws NumberFormatException,            IOException {        BufferedReader read = new BufferedReader(new InputStreamReader(               System.in));        int[] a = new int[26];        int tt;        for (int i = 0; i < 4; i++) {            String str = read.readLine();            for (int j = 0; j < str.length(); j++) {               tt = str.charAt(j) - 'A';               if (tt >= 0 && tt <= 25) {                   a[tt]++;               }            }        }        int max = 0;        for (int i = 0; i < 26; i++) {            if (a[i] > max) {               max = a[i];            }        }        char[][] c = new char[max + 1][51];        for (int i = 0; i < max + 1; i++) {            Arrays.fill(c[i], ' ');        }        for (int i = 0; i < 26; i++) {            int h = a[i];            for (int j = 0; j < h; j++) {               c[max - 1 - j][i * 2] = '*';            }        }        for (int i = 0; i < 26; i++) {            c[max][i * 2] = (char) ('A' + i);        }        for (int i = 0; i < max + 1; i++) {            String str = String.valueOf(c[i]);            while (str.endsWith(" ")) {               str = str.substring(0, str.length() - 1);            }            System.out.println(str);        }     }