使用 Java 查找字符串中出现次数最多的字符以及出现的次数？

使用 Java 查找字符串中出现次数最多的字符以及出现的次数？

import java.util.HashMap;
import java.util.Map;

public class TestStringSum {
	public static void main(String[] args) {
		String str = "abcdefgaaabbb";
		int max = 0;
		Map<Character, Integer> map = new HashMap<Character, Integer>(str.length());
		for (char c : str.toCharArray()) {
			Integer i = map.get(c);
			int value = (i == null) ? 0 : i;
			map.put(c, ++value);
			max = value > max ? value : max;
		}
		for (Character key : map.keySet()) {
			if (map.get(key) == max) {
				System.out.println("most frequent Character => " + key + ", Count => " + max);
			}
		}
	}
}

点击查看结果

```
most frequent Character => a, Count => 4
most frequent Character => b, Count => 4
```

参考链接

• https://stackoverflow.com/questions/21750365/how-to-find-the-most-frequently-occurring-character-in-a-string-with-java/21750550