Java程序统计每个字符的出现次数

编写一个Java程序, 该程序打印每个字符出现的次数, 并且也不应重复打印重复字符的出现, 如示例中所示：
例子：

Input : lsbin Output : Number of Occurrence of g is:2 Number of Occurrence of e is:4 Number of Occurrence of k is:2 Number of Occurrence of s is:2 Number of Occurrence of f is:1 Number of Occurrence of o is:1 Number of Occurrence of r is:1

这个想法是创建一个大小为256的计数数组。遍历输入字符串, 并为每个字符增加其计数。

class NoOfOccurenceOfCharacters { static final int MAX_CHAR = 256 ; static void getOccuringChar(String str) { //Create an array of size 256 i.e. ASCII_SIZE int count[] = new int [MAX_CHAR]; int len = str.length(); //Initialize count array index for ( int i = 0 ; i < len; i++) count[str.charAt(i)]++; //Create an array of given String size char ch[] = new char [str.length()]; for ( int i = 0 ; i < len; i++) { ch[i] = str.charAt(i); int find = 0 ; for ( int j = 0 ; j < = i; j++) {//If any matches found if (str.charAt(i) == ch[j]) find++; }if (find == 1 ) System.out.println( "Number of Occurrence of " + str.charAt(i) + " is:" + count[str.charAt(i)]); } } public static void main(String[] args) { Scanner sc = new Scanner(System.in); String str = "lsbin" ; getOccuringChar(str); } }

【Java程序统计每个字符的出现次数】输出如下：

Number of Occurrence of g is:2 Number of Occurrence of e is:4 Number of Occurrence of k is:2 Number of Occurrence of s is:2 Number of Occurrence of f is:1 Number of Occurrence of o is:1 Number of Occurrence of r is:1