如何判断两个字符串是否由相同的字符组成？

数据结构与算法

看清，。，。不是问的是不是相等，相等只是其中一种情况.假如不是需要每个相同字符的个数也一样的话比较麻烦，倘若要求一样那就直接排序后euqals

1.首发----相等字符的个数不等，。，时间复杂度不是很好

public class Solution {
    public boolean hasEqualChars(String a, String b) {
        if (a == null || b == null) {
            return false;
        }
        if (a.equals(b)) {
            return true;
        }
        char[] charA = a.toCharArray();
        char[] charB = b.toCharArray();
        int len = 'z' - 'A' + 1;
        int[] book = new int[len];
        boolean result = true;
        out:
        for (char i = 'A'; i <= 'z'; i++) {
            int temp = i - 'A';
            for (int j = 0; j < charA.length; j++) {
                if (i == charA[j]) {
                    book[temp] = 1;
                }
            }
            for (int j = 0; j < charB.length; j++) {
                if (i == charB[j]) {
                    if (book[temp] == 1) {
                        book[temp] = 0;
                    } else {
                        result = false;
                        break out;
                    }
                }
            }
        }
        for (int i : book) {
            if (i != 0) {
                result = false;
            }
        }
        return result;
    }
    public static void main(String[] args) {
        Solution solution = new Solution();
        String a = "Aardr";
        String b = "Aadr";
        System.out.println(solution.hasEqualChars(a, b));
    }
}

2.相等字符的个数相等