import java.util.Scanner;
import java.util.TreeMap;
/**
* 从键盘输入16位长整数,编程统计每个数字出现的个数
* @author young
*
*/
public class CharMapDemo {
public static TreeMap<Character, Integer> Pross(String str) {
char[] charArray = str.toCharArray();
TreeMap<Character, Integer> tm = new TreeMap<Character, Integer>();
for (int x = 0; x < charArray.length; x++) {
if (!tm.containsKey(charArray[x])) {
tm.put(charArray[x], 1);
} else {
int count = tm.get(charArray[x]) + 1;
tm.put(charArray[x], count);
}
}
return tm;
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个长整数:");
int temp = sc.nextInt();
String str = String.valueOf(temp);
TreeMap<Character, Integer> tm = Pross(str);
System.out.println(tm);
}
}
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/7c1ed21b0ef41bd555db042d55da81cb38db3d5b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追问还没有学map,能不能用循环和方法做啊,谢谢