import org.testng.annotations.Test;import sun.org.mozilla.javascript.internal.ast.NewExpression;
import java.util.*;
/** * Created by liangwei on 2018/10/18. */public class SearchString { /** * 找出重复字符、记录重复字符次数、记录重复字符位置 * @param str * @return map */ public Map get_str_count_index(String[] str){ Map map = new HashMap();//key值记录重复的字符串，value记录出现的次数和位置 int i = 0; for (String s:str ){ if (map.get(s)==null){ Map count_where = new HashMap();//key值记录重复字符串出现的次数，value记录重复字符出现的位置 int count = 1;//重复字符串计数器 ArrayList list = new ArrayList(); list.add(i);//重复字符串下标 count_where.put(count,list); map.put(s,count_where); i++; }else { for (int c:map.get(s).keySet()){ ArrayList index = map.get(s).get(c); index.add(i);//增加出现index位置 c++; map.get(s).put(c,index);//更新计数器和下标信息 map.get(s).remove(--c);//删除掉之前的记录信息 } i++; } } return map; }
public void display(String[] arry) throws Exception{ if (arry==null){ throw new Exception("输入数组为空，请重新输入"); } Map map = get_str_count_index(arry); ArrayList count = new ArrayList();//存取所有字符串出现的次数 for (Map.Entry key : map.entrySet()){//循环获取记录字符串重复次数和位置map for (Map.Entry map1 :key.getValue().entrySet()){//循环获取记录字符串重复次数 count.add(map1.getKey()); } } // Arrays.sort(count.toArray()); Collections.sort(count);//对集合排序，默认是升序，最后一个是重复次数最多的 //打印重复次数最多的元素信息 for (String key : map.keySet()){//循环获取所有的重复字符串 for (int c:map.get(key).keySet()){//循环获取重复字符串的次数 if (c == count.get(count.size()-1)){//和最大重复次数对比，相等就代表当前的字符串是重复次数最多的那个 System.out.printf("重复次数最多的字符串是：%s,重复次数%d,所在位置：%s ",key,c,map.get(key).get(c)); } } } //输出指定重复次数的字符串信息 for (String key :map.keySet()){ for (int c:map.get(key).keySet()){ if (c==5||c==6||c==1){ System.out.printf("重复字符串：%s,重复次数：%d,重复字符串出现位置：%s ",key,c,map.get(key).get(c)); } } } }
public static void main(String[] args) { String[] arry = {"aa","bb","cc","bb","aa","ooo","dd","aaa","aa"}; // String[] arry = {}; SearchString searchString = new SearchString(); try { searchString.display(arry); } catch (Exception e) { e.printStackTrace(); } }}