取字符串中的字符 charAt(j);
取数组中的元素 array[i];
package day10.abs;
import java.util.HashMap;
public class CountAll {
public static void main(String[] args) {
HashMap hm = new HashMap();
String B = "AABDDSEE";
for (int j = 0; j < B.length(); j++) {
char b = B.charAt(j);
System.out.println("字符串b为:" + b);
}
String[] A = {"AAA", "A", "A", "B", "C", "C", "D", "S", "D", "D", "D"};
for (int i = 0; i <= A.length - 1; i++) {
String key = A[i];
System.out.println("数组key为:" + key);
Object ob = hm.get(key);
if (ob == null) {
// 如果key对应的value没有,第0次
hm.put(key, 1);
} else {
int value = Integer.parseInt(ob.toString());
hm.put(key, value + 1);
}
}
System.out.println(hm);
}
}