Question

java怎么计算一个字符在字符串中出现的次数

Answer 1

import
java.util.*;
public
class
Test
{
public
static
void
main(String
args[]){
String
s
=
"abcdad";
//待测试的字符串
Map<Character,
Integer>
result
=
getCharMaps(s);
System.out.println(result);//打印出字符串中各字符出现的次数！
}
public
static
Map<Character,
Integer>
getCharMaps(String
s)
{
Map<Character,
Integer>
map
=
new
HashMap<Character,
Integer>();
for(int
i
=
0;
i
<
s.length();
i++)
{
Character
c
=
s.charAt(i);
Integer
count
=
map.get(c);
map.put(c,
count
==
null
?
1
:
count
+
1);
}
return
map;
}
}