产生随机字符并进行计数

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package array;

//import java.util.Scanner;

public class CountLetter {

public static void main(String[] args) {
  // 统计每个字母出现的次数

  char[] chars = creatArray();

  System.out.println("The lowersletter is ");
  displayArray(chars);

  int[] counts = countchars(chars);
  System.out.println();

  System.out.println("The occurences of each letter are ");
  displayCount(counts);
}

public static char[] creatArray()//创建一个数组
{
  //Scanner input = new Scanner(System.in);
  char[] chars = new char[100];
  for(int i=0;i<100;i++)
   chars[i] = getRandomLowerCaseLetter(); //调用函数产生随机字符
  return chars;

}

public static void displayArray(char[] a)//打印出数组
{
  for(int i=0;i<100;i++)
  {
   if((i+1)%20 ==0)//控制输出格式
    System.out.println(a[i]);
   else
    System.out.print(a[i]+" ");
  }
}

public static int[] countchars(char[] b)//进行计数
{

  int[] counts = new int[26];
  for(int i=0;i<b.length;i++)
  {
   counts[b[i]-'a']++;//巧妙运用字符的计算转换为ACSII值
  }
  return counts;//只用返回首地址即返回数组

}

public static void displayCount(int[] c)//打印出对应的数量
{
  for(int i=0;i<c.length;i++)
  {
   if((i+1)%10==0)//控制格式
    System.out.println(c[i]+" "+(char)(i+'a'));
   else
    System.out.print(c[i]+" "+(char)(i+'a')+" ");
  }
}

public static char getRandomLowerCaseLetter()
{
return getRandomCharacter('a','z');
}

public static char getRandomCharacter(char a,char b)
{
return (char)(a+Math.random()*(b-a+1));//利用Math.random()产生随机数，然后进行强制转换变为字符
}

}

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