java中使用Map集合判断字符串中字符出现次数

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;
public class Test {
public static void main(String[] args) {
System.out.println("*********请输入字符串************");
Scanner scanner=new Scanner(System.in);
String string=scanner.next();

Map map=new HashMap<Character,Integer>();
char[]arrchar=string.toCharArray();

for (int i = 0; i < arrchar.length; i++) {
map.put(arrchar[i], 0);
}

for (int i = 0; i < arrchar.length; i++) {
if(map.containsKey(arrchar[i])){
int temp=(Integer)map.get(arrchar[i]);
temp++;
map.put(arrchar[i],temp);
}
}

System.out.println("*********字符出现次数************");
String string2= map.toString();
System.out.println(string2);
}

}