import java.util.HashMap;
import java.util.Map;
/**
* 频率统计
* @author Administrator
*
*/
public class FrequencyCount_11_13<T> {
/**Map的key是需要统计的值,value是个数**/
private Map<T, Integer> map = new HashMap<T, Integer>();
/**将统计数值一键值对形式存放在map中**/
public void statistics(T t) {
map.put(t, map.get(t) == null ? 1 : map.get(t) + 1);
}
/**以键值对的形式输出如:关键字-出现的个数**/
public void getAllStatistics() {
System.out.println(map);
}
/**获取所有的关键字**/
public void getAllKeys() {
System.out.println(map.keySet());
}
/**获取指定关键字出现的频率**/
public void getKeyStatistics(T t) {
System.out.println(t + "出现的次数为:" + map.get(t) == null ? 0 : map.get(t));
}
//测试
public static void main(String[] args) {
String test = "小明大丑男046KAK大丑男DNAS60lge";
FrequencyCount_11_13<Character> frequencyCount = new FrequencyCount_11_13<Character>();
for(int i=0;i<test.toCharArray().length;i++) {
frequencyCount.statistics(test.toCharArray()[i]);
}
frequencyCount.getAllStatistics();
frequencyCount.getAllKeys();
frequencyCount.getKeyStatistics('K');
}
}
运算结果:
{D=1, g=1, 大=2, e=1, 明=1, A=2, 丑=2, 男=2, l=1, N=1, K=2, 小=1, 0=2, 6=2, S=1, 4=1}
[D, g, 大, e, 明, A, 丑, 男, l, N, K, 小, 0, 6, S, 4]
2