校招笔试题编程技巧总结

技巧一：//统计字符串s1的频率

    String s1 = in.nextLine();
//统计字符串s1的频率
        for (char c1 : s1.toCharArray()) {
            if (hashMap1.containsKey(c1)) {
                hashMap1.put(c1, hashMap1.get(c1) + 1);
            } else {
                hashMap1.put(c1, 1);
            }
        }

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