初学Java 数组统计字母 

 1 public class CountLetterInArray {
 2   public static void main(String[] args) {
 3       char[] chars = createArray();
 4       
 5       System.out.println("The lowercase letters are: ");
 6       displayArray(chars);
 7       
 8       int[] counts = countLetters(chars);
 9       
10       System.out.println(" ");
11       System.out.println("The occurrences of each letter are: ");
12       displayCounts(counts);
13   }
14 
15   public static char[] createArray() {
16       char[] chars = new char[100];
17       for(int i=0; i<chars.length; i++) {
18           chars[i] = RandomCharacter.getRandomLowerCaseLetter();
19       }
20       return chars;  
21       
22   }
23   public static void displayArray(char[] chars) {
24       for(int i=0; i<chars.length; i++) {
25           if((i+1)%20==0)
26             System.out.println(chars[i]);
27           else
28               System.out.print(chars[i]+" ");
29       }
30   }
31   public static int[] countLetters(char[] chars) {
32      int[] counts = new int[26];
33      
34      for(int i=0; i<chars.length; i++) {
35          counts[chars[i]-'a']++;
36      }
37      return counts;
38   }
39   public static void displayCounts(int[] counts) {
40       for(int i=0; i<counts.length; i++) {
41           if((i+1)%10==0)
42               System.out.println(counts[i]+" "+(char)(i+'a'));
43           else
44               System.out.print(counts[i]+" "+(char)(i+'a')+" ");
45       }
46   }
47 }

 

posted @ 2018-10-11 10:42  LeoLiY  阅读(695)  评论(0)    收藏  举报