class RandomCharacter
代码：
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public class RandomCharacter { public static char getRandomCharacter(char ch1,char ch2){ return (char)(ch1+Math.random()*(ch2-ch1+1)); } public static char getRandomLowerCaseLetter(){ return getRandomCharacter('a','z'); } public static char getRandomUpperCaseLetter(){ return getRandomCharacter('A','Z'); } public static char getRandomDigitCharacter(){ return getRandomCharacter('0','9'); } public static char getRandomCharacter(){ return getRandomCharacter('\u0000','\uFFFF'); } } |
class CountLettersInArray
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public class CountLettersInArray { public static void main(String[] args){ char[] chars=createArray(); System.out.println("The lowercase letters are:"); displayArray(chars); int[] counts=countLetters(chars); System.out.println(); System.out.println("The occurrences of each letter are:"); displayCounts(counts); } public static char[] createArray(){ char[] chars=new char[100]; for(int i=0;i<chars.length;i++) chars[i]=RandomCharacter.getRandomLowerCaseLetter(); return chars; } public static void displayArray(char[] chars){ for(int i=0;i<chars.length;i++){ if((i+1)%20==0) System.out.println(chars[i]+" "); else System.out.print(chars[i]+" "); } } public static int[] countLetters(char[] chars){ int[] counts=new int[26]; for(int i=0;i<chars.length;i++) counts[chars[i]-'a']++; return counts; } public static void displayCounts(int[] counts){ for(int i=0;i<counts.length;i++){ if((i+1)%10==0) System.out.println(counts[i]+" "+(char)(i+'a')); else System.out.println(counts[i]+" "+(char)(i+'a')+" "); } } } |
