Question

输入一个字符串，输出每个字符出现的次数,用Java如何实现

Answer 1

用length()方法、charAt方法结合for循环就行了，

package com.golden.test;

public class TestString {

public static void main(String[] args) {

String str = "你叫神马？我叫Tesson.";

for (int i = 0; i < str.length(); i++) {

char item = str.charAt(i);

System.out.println(item);

}

}

}

Answer 2

import java.util.*;

public class Test {

public Map<Character, Integer> fun(String string){
Map<Character, Integer> map = new HashMap<Character, Integer>();
for (int i = 0; i < string.length(); i++) {
char c = string.charAt(i);
if(null == map.get(c))map.put(c, 1);
else {
int length = map.get(c)+1;
map.put(c, length);
}
}
return map;
}

public static void main(String[] args) {

Test test = new Test();
Map<Character, Integer> map = test.fun("xsakjnakbashkjnxajkvhkdcnajkxhsjkac");
for (Entry<Character, Integer> entry : map.entrySet()) {
System.out.println(entry.getKey()+":"+entry.getValue());
}

}
}