java如何实现字符串压缩

public static void zipStr(String str) { char[] c = str.toCharArray(); int index = 0; int num = 1; int len = c.length; while (index < len - 1) { while (c[index] == c[index + 1]) { num++; index++; if (index >= len - 1) { break; } } System.out.print(c[index]); System.out.print(num); num = 1; index++; } }

public static HashMap fun1(String str) { HashMap map = new HashMap(); char[] c = str.toCharArray(); for (int i = 0; i < c.length; i++) { Integer count = map.get(c[i]);//此处的count的类型一定要为Integer，如果为int类型，则count值为0 if (!map.containsKey(c[i])) { map.put(c[i], 1); } else { map.put(c[i], count + 1); } } return map; }