Java 程序统计每个字符的出现次数
编写一个 Java 程序，打印每个字符的出现次数，并且它不应该重复打印重复字符的出现次数，如示例所示: 示例:
Input : geeksforgeeks
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
进场:
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。
Java 语言（一种计算机语言，尤用于创建网站）
// Java program for the above approach
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)]);
}
}
// Driver Code
public static void main(String[] args)
{
String str = "geeksforgeeks";
getOccuringChar(str);
}
}
输出:
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
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